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Posted by: Raymond McDougall on 03.26.2019 | Filed under: Latest, Recent Mineral Updates | Comments (0)

I’ve posted great new fluorites in this Madagascar Fluorite Update (click here).

Discovered in 2017, this Madagascar green fluorite is from Mandrosonoro, Ambatofinandrahana, Amoron’i Mania. The green varies in darkness from specimen to specimen, and the hue is reminiscent of the specimens produced at the Rogerley Mine (Frosterley, Durham, England).

The apparent colour of these fluorite specimens varies depending upon light source – these photos are adjusted to basic daylight, shade (same as all specimen photos on the website), and this is the lighting that brings out their colour the best. However, in actual daylight, these fluorites exhibit varying degrees of fluorescence, from faint to obvious blue (not at all as strongly as with Rogerley fluorites). Under UV lighting, they fluoresce bright blue-purple.

The Mandrosonoro fluorites are collected by local inhabitants and the quality of the first pieces I saw (in 2018) was very poor. On the whole, the quality of almost all pieces available to date has remained poor with lots of damage – the specimens in this update are of exceptional quality for the find.

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 11.0 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 7.2 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 7.4 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 9.2 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 7.8 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 6.3 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 14.0 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 9.9 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 7.8 cm

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar

Fluorite, Mandrosonoro, Ambatofinandrahana, Amoron’i Mania, Madagascar – 7.8 cm

Posted by: Raymond McDougall on 03.09.2019 | Filed under: Latest, Recent Mineral Updates | Comments (0)

I’ve posted great new amethyst specimens in this Indonesia Update (click here). Known as “grape amethyst”, these pieces feature beautiful groups of amethyst balls.

Originally referred to as “grape agate”, specimens were first found in the Mamuju area in 2015. These specimens are recovered from clay, in the spaces between the “pillows” in pillow lava.  Although they were first known as “grape agate”, they are not cryptocrystalline (and therefore are not agate) – they are balls of radiating crystalline quartz. When the find first came to market, there was a large amount of material, much of which was poor quality. With the passage of time, the diggers began to produce higher quality specimens. The recent article on this material in the Mineralogical Record (Nov-Dec. 2018) observes that the production of fine specimens is beginning to decline, although there are still a few very active teams working the deposits. The article speculates, based upon local sources, that all specimen mining of the pillow lava deposits will likely cease within the next three to four years. As with all mineral specimen localities, the ultimate accuracy of such speculation varies. In this case, the limited geographical extent of the known pillow lava deposits is a key factor.

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, IndonesiaQuartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 12.4 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 10.0 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 11.4 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 8.1 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 7.7 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 7.1 cm

102290(3)

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 8.3 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 5.7 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 6.8 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 4.0 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 3.9 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 3.8 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 4.0 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 4.3 cm

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia

Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia – 3.5 cm

Posted by: Raymond McDougall on 02.27.2019 | Filed under: Latest, Recent Mineral Updates | Comments (0)

I’ve added some super new specimens in this Elmwood Update (click here). This update features beautiful high-quality twinned calcite crystals, and also a great fluorite.

First opened in the 1970s, the Elmwood Mine (the Elmwood-Gordonsville-Cumberland mining complex) has produced some of the world’s finest calcite crystals, many of which are twinned. Over the years, the miners referred to the large orange Elmwood calcite crystals as “footballs”, and they referred to the clear gemmy calcites in this update as “jewels”. These are from a pocket found a few years ago. Most specimens were damaged and these are exceptional – the handful of top-quality specimens in this update are the result of a quest through many flats.

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 7.3 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 8.3 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA – 7.0 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA
Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 10.2 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 10.1 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA
Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 9.8 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 6.5 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 5.9 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, USA

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 5.4 cm

Calcite, Elmwood Mine, Carthage, Tennessee, US

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 5.2 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US - 5.4 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 5.2 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US - 5.4 cm

Calcite (Twinned), Elmwood Mine, Carthage, Smith Co., Tennessee, US – 5.5 cm

Fluorite, Elmwood Mine, Carthage, Smith Co.,  Tennessee, US

Fluorite, Elmwood Mine, Carthage, Smith Co., Tennessee, US – 6.2 cm

Fluorite, Elmwood Mine, Carthage, Smith Co.,  Tennessee, US

Fluorite, Elmwood Mine, Carthage, Smith Co., Tennessee, US

Posted by: Raymond McDougall on 10.23.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

This Egypt Update (click here) features excellent goethite pseudomorphs after marcasite from the White Desert, north of Farafra Oasis.

This locality has been known for a number of years and pseudomorph specimens have come out once in a while. The pseudomorphs occur within the Cretaceous Khoman Chalk, from which the White Desert derives its name. Most crystals have typically been fairly indistinct, and to date sharp specimens have been relatively uncommon. These specimens, collected in 2013 and 2014, are remarkable for their relatively sharp marcasite crystal forms in aesthetic crystal clusters.

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

 Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 7.0 cm

Over the years, these pseudomorphs have been variously labeled hematite, goethite and limonite (the latter no longer a valid mineral species name, but is a term still used in reference to unidentified iron hydroxides, so its use has not been incorrect). Recent work by Hannah Allen at Hamilton College has confirmed that the White Desert pseudomorphs are predominantly goethite. The small white grains lodged in among the crystal blades are barite, calcite and gypsum. (Allen, Hannah M., Pseudomorphed Mineral Aggregates of the Khoman Chalk, Western Desert, Egypt, Geological Society of America Abstracts with Programs. Vol. 46, No. 2, p.66 (2014)).

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

 Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 5.4 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 6.1 cm

Although pseudomorphs after cubic and cuboctahedral pyrite crystals have also been found in the Khoman Chalk, the pseudomorphs after marcasite are more dramatic. These pseudomorphs are excellent specimens featuring beautiful marcasite crystal morphology, showing habits and forms exhibited by the crystallized marcasite specimens from the famous occurrences at Cap-Blanc-Nez, Pas-de-Calais, France.

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

 Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.8 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 5.7 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, EgyptGoethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 6.5 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 4.5 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 4.1 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.6 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.8 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.1 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.0 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.0 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt – 3.3 cm

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt

Goethite pseudomorph after marcasite, White Desert, north of Farafra Oasis, Egypt
Same specimen as in the previous photo, bird’s eye view, 2.2 cm across

Posted by: Raymond McDougall on 07.25.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve posted superb new specimens in this new Bou Azzer Update (click here). A few localities from this famous Moroccan mining district are represented, including the famous Agoudal Mine, which unfortunately has just recently closed.

Roselite on calcite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Roselite on calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 7.7 cm

Roselite, epitactic on beta-roselite, with cobaltausitnite, on cobaltoan calcite, Bou Azzer District, Tazenakht, Ouarzazate, MoroccoRoselite, epitactic on beta-roselite, with cobaltausitnite, on cobaltoan calcite
Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
5.7 cm

Roselite, epitactic on beta-roselite, on cobaltoan calcite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Roselite, exhibiting epitactic orientation on beta-roselite
Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Roselite with minor beta-roselite, on calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Roselite with minor beta-roselite, on calcite
Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
5.6 cm

Roselite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Roselite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco- 6.3 cm

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 12.0 cm

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 5.3 cm

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 7.9 cm

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 5.9 cm

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Cobaltoan Calcite, Agoudal Mine, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 4.5 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 9.8 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Field of view 2.0 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Field of view 3.0 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 4.6 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 5.0 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Field of view 4.5 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco – 6.8 cm

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco

Erythrite, Bou Azzer District, Tazenakht, Ouarzazate, Morocco
Field of view 3.0 cm

Gersdorffite, Aït Ahmane Mine,  Bou Azzer, Tazenakht, Ouarzazate Province, Morocco

Gersdorffite, Aït Ahmane Mine, Bou Azzer, Tazenakht, Ouarzazate Province, Morocco – 4.6 cm

Skutterudite, Bouismas Mine,  Bou Azzer, Tazenakht, Ouarzazate Province, Morocco

Skutterudite, Bouismas Mine, Bou Azzer, Tazenakht, Ouarzazate Province, Morocco – 6.1 cm

Skutterudite, Bouismas Mine,  Bou Azzer, Tazenakht, Ouarzazate Province, Morocco

Skutterudite, Bouismas Mine, Bou Azzer, Tazenakht, Ouarzazate Province, Morocco – 4.5 cm

Posted by: Raymond McDougall on 06.27.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve posted some super specimens in this new Tanzania Update (click here). This group of specimens includes a variety of species from several different finds, and includes a world-class alabandite.

Alabandite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

 Alabandite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 7.0 cm

Alabandite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Alabandite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 4.7 cm

Diopside, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Diopside, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 3.7 cm

Grossular Garnet, var. Tsavorite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Grossular Garnet, var. Tsavorite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania
Crystal 0.7 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 5.0 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 5.4 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 3,2 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 3.1 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 5.0 cm

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania

Prehnite, Merelani Hills, Lelatima Mountains, Manyara, Tanzania – 4.2 cm

Spessartine Garnet, Nani, Loliondo, Arusha, Tanzania

Spessartine Garnet, Nani, Loliondo, Arusha, Tanzania

Tremolite, Mwajanga, Manyara, Tanzania

Tremolite, Mwajanga, Manyara, Tanzania

Kyanite (Twinned), Nani, Loliondo, Arusha, Tanzania

Kyanite (Twinned), Nani, Loliondo, Arusha, Tanzania – 3.0 cm

Kyanite (Twinned), Nani, Loliondo, Arusha, Tanzania

Kyanite (Twinned), Nani, Loliondo, Arusha, Tanzania – 3.0 cm

Posted by: Raymond McDougall on 05.22.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve posted a small number of excellent pyrite iron cross twins from Colombia in this update (click here).

“Iron-cross twins” are twinned crystals exhibiting the forms of two pentagonal dodecahedra (also known as pyritohedra). These twins display edges crossing at 90 degrees, and in an idealized/model twin, these edges form a cross. In nature, the edges that form the cross are sometimes not continuous or are not equal to one another, so a pyrite crystal that is twinned according to the iron-cross law may or may not exhibit an actual cross shape, but in any event the relationship of the crystals exhibits the “crossed” symmetry.

The iron cross twin law is well known and exhibited in specimens from various localities, but rarely does one find good-sized complete crystals. These remarkable specimens are from a find about a year ago near Gachalá, Colombia. They are superb iron-cross twins.

These were being sold as “limonite” pseudomorphs after pyrite, but they are not. They are pyrite crystals with a thin surface veneer of goethite.

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

 Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 5.0 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 4.2 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 3.8 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 3.7 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 2.9 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 3.2 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 2.9 cm

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia

Pyrite Iron-Cross Twin, Gachalá, Cundinamarca, Colombia – 3.0 cm

Posted by: Raymond McDougall on 04.13.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added some great specimens from a new find in this Bolivia Amethyst Update (click here). These are beautiful glassy crystals – some doubly-terminated, and some exhibit a great reverse-sceptre habit.

There isn’t more specific information about the locality at this time – I’m told that this is because it is in an unnamed area of Potosi, not near to any named settlement or geographic feature. The specimens were discovered by farmers, at the edge of a field area, bordering hills.

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – 6.3 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 2.3 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – 5.3 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – 4.7 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 3.0 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 3.5 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 4.5 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 4.0 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst (reverse sceptre), Potosí, Bolivia – field of view 1.5 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia – field of view 2.5 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia, with negative quartz crystal inclusions
Field of view 1.5 cm

Quartz. var. amethyst, Potosí, Bolivia

Quartz. var. amethyst, Potosí, Bolivia, with negative quartz crystal inclusions
Field of view 1.2 cm

Posted by: Raymond McDougall on 03.30.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added excellent specimens from two great Peruvian localities in this Peru Update (click here) – tennantite specimens from Mundo Nuevo and pyrite specimens from Huanzala.

The Mundo Nuevo tennantites are excellent specimens for the species. Mined during 2014-15 specimen recovery work, they are part of a find that has now been analyzed quite extensively. Of those (over 40 specimens tested) all were tennantite except one that was a borderline tennantite-tetrahedrite. Accordingly, specimens from this find are now labelled tennantite. I have not had each of these analyzed, given the pervasive tennantite results (and not wanting to add to their prices by incurring unnecessary cost). These tennantites were originally posted on this website labelled “tetrahedrite”, as they were sold to me under that label – they were then removed from the site until the analysis work on the find had been completed.

Tennantite, Mundo Nuevo Mine,  Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru

 Tennantite, Mundo Nuevo Mine, Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru
Field of view 4.0 cm

Tennantite, Mundo Nuevo Mine,  Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru

Tennantite, Mundo Nuevo Mine, Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru – 8.1 cm

Tennantite, Mundo Nuevo Mine,  Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru

Tennantite, Mundo Nuevo Mine, Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru – 8.0 cm

Tennantite, Pyrite, Mundo Nuevo Mine,  Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru

Tennantite, Pyrite, Mundo Nuevo Mine, Mine, Huamachuco, Sanchez Carrion Province,
La Libertad Dept., Peru – 7.6 cm
The pyrite specimens from Huanzala are particularly high quality ones I’ve acquired individually in recent years, including a couple acquired in Peru.
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
 Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 6.5 cm
102142(1)(7.1)
 Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 7.1 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
 Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
Field of view 6.0 cm
 Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., PeruPyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 11.5 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 7.5 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 6.3 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru
 Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 5.0 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., PeruPyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 5.3 cm
Pyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., PeruPyrite, Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Dept., Peru – 5.6 cm
Posted by: Raymond McDougall on 03.16.2018 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added some beautiful new specimens in this China Fluorite Update (click here). These include specimens from Xiayang, Yongchin Co., Fujian, where the 2017 find of “tanzanite fluorites” was made. This update also features a gorgeous fluorite with calcite from the famous Xianghuapu Mine, water-clear crystals from Huanggang Mines, and purple octahedra from the De’An Mine.

Fluorite, Xiayang, Yongchun Co., Fujian, China

Fluorite, Xiayang, Yongchin Co., Fujian, China – 5.2 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China

Fluorite, Xiayang, Yongchun Co., Fujian, China – 3.5 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China
Fluorite, Xiayang, Yongchun Co., Fujian, China – 5.4 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China

Fluorite, Xiayang, Yongchun Co., Fujian, China – 9.7 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China

Fluorite, Xiayang, Yongchun Co., Fujian, China – 8.0 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China

 

Fluorite, Xiayang, Yongchun Co., Fujian, China – 6.0 cm

Fluorite, Xiayang, Yongchun Co., Fujian, China

Fluorite, Xiayang, Yongchun Co., Fujian, China – 4.8 cm

Fluorite with Calcite, Xianghuapu Mine, Chenzhou Prefecture, Hunan, China

Fluorite with Calcite, Xianghuapu Mine, Chenzhou Prefecture, Hunan, China – 12.7 cm

Fluorite with Calcite, Xianghuapu Mine, Chenzhou Prefecture, Hunan, China

Fluorite, Huanggang Mines, Hexigten Banner, Ulanhad, Inner Mongolia A.R., China
Field of view 3.5 cm

Fluorite, De'An Mine, China

Fluorite, De’An Mine, Wushan, Jianxi, China – 9.8 cm

Fluorite, De'An Mine, China

Fluorite, De’An Mine, Wushan, Jianxi, China – 5.8 cm