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Posted by: Raymond McDougall on 04.24.2019 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added super new specimens in this latest US Update (click here). These include an exceptional grossular, from one of the world’s top finds, and the best known find of grossular crystals with prominent cube faces, Vesper Peak, Washington.  This update also includes a top quality rutile from Graves Mountain, Georgia, a very fine Bisbee malachite after azurite, great new lightly-amethystine quartz from North Carolina with an aesthetic growth habit, some Colorado amazonites with excellent colour, along with a La Sal azurite and a Cave-in-Rock fluorite.

Grossular garnet, Vesper Peak, Snohomish Co., Washington, USAGrossular, Vesper Peak, Snohomish Co., Washington, USA
Field of view – 4 cm

Rutile, Graves Mountain, Lincoln Co., Georgia, USA

Rutile, Graves Mountain, Lincoln Co., Georgia, USA – 4.0 cm

Malachite pseudomorph after azurite, Sacramento Pit, Bisbee, Warren District, Cochise Co., Arizona, USA Malachite pseudomorph after azurite, Sacramento Pit, Bisbee, Warren District, Cochise Co., Arizona, USA
Field of view 5.0 cm

Azurite, Big Indian Mine, La Sal, San Juan Co., Utah, USA Azurite, Big Indian Mine, La Sal, San Juan Co., Utah, USA – 3.4 cm

 Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA – 4.0 cm

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA

 Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA – 4.7 cm

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA – 4.5 cm

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA

Quartz, var. Amethyst, Purple Flame Pocket, Cabbaras Co., North Carolina, USA – 4.7 cm

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA – 5.6 cm

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA

Microcline, var. Amazonite, Silent Valor Pocket, Smoky Hawk Claim, Crystal Peak Area,
Teller Co., Colorado, USA – 4.5 cm

Microcline, var. Amazonite, Big Peggy Pocket, Old Man Rock, Florissant, Teller Co., Colorado, USA

Microcline, var. Amazonite, “White Cap”, Big Peggy Pocket, Old Man Rock,
Florissant, Teller Co., Colorado, USA – 3.8 cm

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA – 4.1 cm

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA

Microcline, var. Amazonite, Foretell Pocket, Smoky Hawk Claim, Crystal Peak Area,
Teller Co., Colorado, USA – 3.7 cm

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA

Microcline, var. Amazonite, Smoky Hawk Claim, Crystal Peak Area, Teller Co., Colorado, USA – 4.0 cm

Fluorite, Cave-in-Rock, Hardin Co., Illinois, USA

Fluorite, Cave-in-Rock, Hardin Co., Illinois, USA – 6.6 cm

Posted by: Raymond McDougall on 02.28.2016 | Filed under: Latest, Recent Mineral Updates | Comments (0)

I’ve posted some vibrant specimens of chrysocolla pseudomorphs in the new Chrysocolla Update (click here).

Ajoite, Luputo Mine, Lubumbashi, Democratic Republic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo – 8.1 cm

Definitive identification of these specimens has been confirmed. The specimens from this find have been identified as chrysocolla by way of chemical analysis conducted by Dr. Hexiong Yang of the University of Arizona. A preliminary Raman spectroscopic analysis had led to the suggestion of an ajoite identification (which was posted on mindat), but the Raman for each of these minerals is very similar and was therefore inconclusive.

Ajoite, Luputo Mine, Lubumbashi, Democratic Republic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo – 8.7 cm

A couple of observations about these specimens lead me to believe there is some complexity to the formation history. In spots where the underlying pseudomorphs are incomplete, one can examine the cross-sections. Some of those cross-sections reveal that the malachite core is entirely gone (and seems to be chrysocolla), while others retain some malachite. In addition, upon close examination with magnification, one can see there are small malachites sprinkled about, meanwhile the chrysocolla “crystals” have a rather rounded appearance. I believe that the small chrysocolla aggregates themselves are related to the malachite, as pseudomorphs after the malachite. These specimens might in fact be “chrysocolla pseudomorphs after malachite, on chrysocolla pseudomorphs (partial and complete) after malachite pseudomorphs after azurite.” Doesn’t fit on a label so easily, but these are highly unusual and remarkable specimens.

Ajoite, Luputo Mine, Lubumbashi, Democratic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo
Field of view 1.0 cm

These are delicate specimens, with some growths that are thin. As a result, there are incomplete pseudomorphs on almost all I have seen – in fact some are either prominently or mostly without complete ones. These incomplete pseudomorphs actually help to guide our understanding of the specimen’s formation.

Ajoite, Luputo Mine, Lubumbashi, Democratic Republic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo
Field of view 1.0 cm

Ajoite, Luputo Mine, Lubumbashi, Democratic Republic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo – 5.8 cm

Ajoite, Luputo Mine, Lubumbashi, Democratic Republic of the CongoChrysocolla, Luputo Mine, Lubumbashi, Democratic Republic of the Congo
Field of view 1.3 cm

Posted by: Raymond McDougall on 06.12.2015 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added a new Namibia Update (click here) with selected excellent specimens from the Tsumeb Mine and also from the Kaokoveld Plateau in Namibia.

 Cerussite, Tsumeb Mine, Otjikoto Region, NamibiaCerussite, Tsumeb Mine, Otjikoto Region, Namibia – 4.4 cm

Cerussite, Tsumeb Mine, Otjikoto Region, NamibiaCerussite and Goethite, Tsumeb Mine, Otjikoto Region, Namibia – 4.9 cm

Cerussite, Tsumeb Mine, Otjikoto Region, NamibiaCerussite, Tsumeb Mine, Otjikoto Region, Namibia – 5.2 cm

Copper, Tsumeb Mine, Otjikoto Region, NamibiaCopper, Tsumeb Mine, Otjikoto Region, Namibia – crystal group 1.5 cm

Malachite pseudomorph after azurite, Tsumeb Mine, Otjikoto Region, NamibiaMalachite pseudomorph after azurite, Tsumeb Mine, Otjikoto Region, Namibia – 5.8 cm

Malachite pseudomorph after azurite, Tsumeb Mine, Otjikoto Region, Namibia Malachite pseudomorph after azurite, Tsumeb Mine, Otjikoto Region, Namibia – 7.2 cm

Smithsonite, Tsumeb Mine, Otjikoto Region, NamibiaSmithsonite, Tsumeb Mine, Otjikoto Region, Namibia – 5.7 cm

Tennantite, Tsumeb Mine, Otjikoto Region, NamibiaTennantite, Tsumeb Mine, Otjikoto Region, Namibia – 5.2 cm

Dioptase, Okandawasi Pit, Kaokoveld Plateau, Kunene Region, NamibiaDioptase, Okandawasi Pit, Kaokoveld Plateau, Kunene Region, Namibia – crystal 1.4 cm

Dioptase, Okandawasi Pit, Kaokoveld Plateau, Kunene Region, NamibiaDioptase, Okandawasi Pit, Kaokoveld Plateau, Kunene Region, Namibia – field of view 2.4 cm