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Posted by: Raymond McDougall on 07.26.2017 | Filed under: Latest, Mineral Shows | Comments (0)

 

In the heart of France’s Vosges Mountains, each June, Mineral World assembles at Sainte-Marie-aux-Mines, Alsace, for what is always a great mineral show.

Alsace is a beautiful place, and this sure is a beautiful time of year.

Saint-Hippolyte, Alsace, France

Saint-Hippolyte, Alsace, with the Chateau du Haut-Koenigsbourg on the crest of the hill in the background.

SteMarie

Everywhere you look, Sainte-Marie-aux-Mines is full of blooms in late June.

Lavender

Lavender is a common sight and scent in Alsace at this time of year.

Ste. Marie’s mining history dates to the 16th century. Located in the Val’D’Argent (“Valley of Silver”), the town was the hub for a vast number of mining operations over a few hundred years that ultimately left approximately 20,000 km of tunnels under and inside these valley hills.

SteMarieHistory

Depiction of historic mining practices in the area of Sainte-Marie-aux-Mines

If you are newer to the website and might not have seen prior Ste. Marie reports, I’ve written a bit more on the history in other years’ posts – there are some good photos as well, for example in the Sainte-Marie-aux-Mines 2015 post (click here).

The Show

For a few days each year, this town is transformed, as mineral and gem people from every corner of the globe get together. The centre of town becomes its own little community with tent “streets” and alleyways in all directions.

Sainte-Marie-aux-Mines Mineral Show

One of the many tent streets, with the Theatre venue in the background.

Although it is a gorgeous time of year in Alsace, 2017’s European heat wave made for some scorching days at the show. One popular way to beat the afternoon heat was the misting station they had installed for the show at the central hub-intersection, by the theatre.

Misting Towers

It was a great idea. Unfortunately for me, I was always carrying flats full of minerals when I passed this intersection… (cardboard mineral boxes and misting don’t mix!)

Of course, hot days can’t stop the quest… and there were some great finds this year.

There has been a large new find of red zircons from the Astor Valley, in Pakistan. A locality that has sporadically produced small amounts of material in recent years, this  find produced a large number of pieces. However, from all I have seen, fine zircons are few. There are two key reasons for this. First, the zircons are enclosed within solid rock with other hard constituent minerals, such that many zircons were broken when they were collected. Second, and a much more prevalent issue, the zircon crystals seem to have formed more or less contemporaneously with most of the other minerals in the deposit – feldspar, biotite mica, and pyroxene – and as a result, most of the zircon crystals are not fully developed. Instead, most zircon crystal growth was interrupted by the growth of these other minerals, and therefore most zircons are simply incomplete, or malformed. And yet, among the well-over 1000 pieces I went through, there were a few super crystals. The colour ranges from hues of wine-red to intense, vivid deep red, with some occasional gradation to much lighter hues, almost colourless.

I’m including a few photos here, and to see more, I’m including a link below these.

Red Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – crystal 3 cm across

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – 2 cm crystal

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – field of view 2 cm

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – field of view 3 cm

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – field of view 2 cm

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan – field of view

These zircon crystals fluoresce yellow under shortwave ultraviolet light.

Zircon, Astor Valley, Gilgit-Baltistan, Pakistan

To see more of these zircon specimens, click here.

As a related aside, if you’ve read my mineral show posts before, you will likely have seen that I joke about shows as “urban field collecting”. So here is an example of one kind of urban field collecting. The Astor Valley red zircons arrived in metal shipping containers, and large numbers were as yet still packed up. Meaning… a few hours in the hot sun… I unpacked each and every zircon from this shipment, never knowing whether the next piece in hand might be a worthy specimen (and usually it was not!).

Urban Field Collecting

This sure isn’t so different from collecting on mine dumps: (1) Each piece you have in hand has no direct relationship to the one next to it. (2) Any piece can be great. and (3) If you don’t keep going through as much material as humanly possible, you will miss the good specimens. So, on you go…

Next, from the well-known locality, Paprok, Afghanistan, there has been new production of some excellent spodumene crystals. Many are bicoloured, light pink and green, while some are one colour or the other. Some of these are very nicely formed!

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan – 5.0 cm (photographed section)

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan – 4.5 cm (photographed section)

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan – 5.0 cm

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan – 4.0 cm (photographed section)

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan

Spodumene, Paprok, Kamdesh District, Nuristan Province, Afghanistan – 2.5 cm (photographed section)

A “new” find of clinochlore has come from Arrondissement Diako, Mali. I say “new” because they are new to us, but were actually collected a while back. The information relayed to me is that these were found six years ago by a geologist prospecting for economic ore minerals. The clinochlores were not considered specimens by the prospector, but have now been tracked down. A very soft mineral, excavated by a commercial prospector, you can imagine that most from the lot are not fine mineral specimens at all, but a very few are really nice, particularly under good lights, where the green becomes visible. Good clinochlore specimens are really not easy to come by, so I was really pleased to find these.

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 3.3 cm

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 4.0 cm

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali

Clinochlore, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 2.5 cm crystal

A few years ago, I managed to acquire a few hematite specimens from just outside the town of Sainte-Marie-aux-Mines itself. These are the hematites from  Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France. I’ve tracked down a few more. Specimens from this locality were collected in the 1970s and 1980s. These are really great, distinctive hematite specimens, from a now classic locality.

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France

Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France – field of view 4.0 cm

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France

Hematite with quartz, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France – 5.8 cm

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France – 8.7 cm

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France

Hematite, Brezouard Massif, Sainte-Marie-aux-Mines, Haut-Rhin, Alsace, France – field of view 5.0 cm

The Show Exhibits

As always, the exhibits were fantastic. This year’s theme was Minerals and Volcanism, with cases dedicated to mineral specimens from volcanic deposits around the world. Of course, they featured many basalt-hosted specimens from localities around the world. Some of these are very well represented by specimens and photographs throughout the world – examples include the Deccan Traps in India and the beautiful amethysts from Artigas, Uruguay – while others are localities and minerals that we rarely see represented. With one exception, I’ve chosen to include photos of a few of the latter for this post. To me, that is often the most amazing part of the Ste. Marie exhibit experience.

Beginning with France, I loved the way this particular display was set up. It was dim, with LED illumination under the five specimens (four corundum crystals and an orange zircon), and did they ever jump to life!

Exhibit 1

From top left, clockwise: Two green-blue corundum crystals from Espaly-Saint-Marcel, Haute Loire (Collection of the Museum of Natural History, London);
Orange zircon from Riou Pezzouliou, Espaly-Saint-Marcel, Haute Loire (Collection of Alain Martaud);
Blue corundum, var. sapphire, from Riou Pezzouliou, Espaly-Saint-Marcel, Haute Loire (Collection of Alain Martaud); and
Blue corundum, var. sapphire, from le Coupet, Haute Loire (Collection of Louis-Dominique Bayle)

This is one of the world’s finest (if not the single finest) specimens of phillipsite. The cruciform twin at the top is about 2.5 cm, and the crystals are sharp and lustrous.

Phillipsite, Alter Stein Quarry, Allendorf, Hessen, Germany - Andreas Leinweber Collection.

Phillipsite, Alter Stein Quarry, Allendorf, Hessen, Germany (Collection of Andreas Leinweber)

This next one is not a rare mineral, but a really classy specimen from an unfamiliar locality.

Aragonite

Aragonite, Gergovy, Puy de Dome, France (Collection of Alain Martaud)

While we’re in Europe, a couple of true classics from Italy:

These are just gorgeous crystals for nepheline.

Nepheline

Nepheline, Mt. Somma, Campania, Italy – crystals to about 1 cm
(From the Struver Collection, 1888, in the Collection of the Museo Universitaria di Scienze della Terra, Italy)

And this vesuvianite is sharp with great lustre.

Vesuvianite

Vesuvianite, Latium, Italy – crystal about 1 cm
(From the Spada Collection, in the Collection of the Museo Universitaria di Scienze della Terra, Italy)

With apologies for the very poor photograph quality (white zeolites really need extra lights and/or reflectors), I wanted to include this specimen despite the photo, because the piece blew me away. It’s a superb analcime from any locality, but check out this locality!

Analcime

Analcime, Kerguelen Islands, French Southern and Antarctic Lands – crystals to 5 cm
Collection of the Museum of Natural History, London

I mentioned one exception for a specimen from a more commonly represented locality, and this is from the abundant deposits in Rio Grande do Sul. It is spectacular! It glistens and sparkles throughout the cavity and was a favourite for many at the show.

Amethyst

Quartz, var. amethyst, Rio Grande do Sul, Brazil – approximately 30 cm
Collection of the National Museum of Natural History, Paris.

And finally I’ll end with what was a great case, a display of specimens from volcanic deposits from the collection of French mineralogist René Just Haüy, generally regarded as the “father of modern crystallography”. These specimens are from the National Museum of Natural History in Paris.

ReneJustHauy

Until next year, so long for now to the beautiful towns and gardens of Alsace…

 Window boxesSaint-Hippolyte, Alsace

Hollyhock

Saint-Hippolyte, Alsace

TwoTowers

Saint-Hippolyte, Alsace

Posted by: Raymond McDougall on 07.08.2015 | Filed under: Latest, Mineral Shows | Comments (0)

Morning sun on cobblestones, flowers spilling out of window boxes, the sounds of church bells and songbirds, swallows dipping and weaving through the village, the smell of fresh baked goods wafting from the boulangerie… fine cheeses and wines, scenic hills of vineyards and lavender-filled gardens… I mean really, what could be better than France in June?

Riquewihr2

Minerals in France in June. (Obviously.)

The annual mineral show at Sainte-Marie-aux-Mines is so different from all others. Sure, we all love the large exciting mineral-filled halls and general mineral mayhem of the large shows, and the hotel shows in Tucson and Denver. But Ste Marie’s character and charm, from the theatre and the tent-lined streets within the show, to the town and the countryside beyond, make this an experience not to be missed.

Ste Marie is in Alsace, a region known for its beautiful small towns, distinctive architecture, hills, valleys and vineyards.

Riquewihr1Alsace village of Riquewihr

Beyond the gardens and planters, there are beautiful wildflowers.

Foxglove2

Wild foxglove (digitalis) at the edge of the forest

The woods and countryside are beautiful, home to a variety of animals. I wasn’t close enough for a good photo of the two deer grazing at the edge of the trees one morning, but I did catch this scene (granted, not so deep in the forest!)

StorksStorks, Alsace

The town of Ste Marie itself is situated in the heart of an historic mining district, the Val d’Argent (the Valley of Silver). This region’s mining history is remarkable, with underground mines dating to the 16th century. They say that within the greater valley and all its hills, there are more than 20,000 km of underground tunnels (!) – not sure how anyone would have calculated that, but even a lesser fraction of that would be astounding, as there is of course almost no evidence of this above-ground.

SteMarieShield

Such a great coat of arms.

Certain of these historic mines have been opened for organized visiting, and it’s well worth the time to go and explore. One such mine is Tellure. Major work has been done at this site to make it accessible to the public, with a modern interpretation centre and underground infrastructure to facilitate tours of small groups. Today, access to the old workings is via an adit which has been driven into the hillside to intersect older workings at various places – an amazing undertaking. This is well done – visitors experience workings of various vintages, from the 16th to the 19th century.

Most of the 16th century workings are irregular and require a small bit of clambering to walk through, as they were cut using only hand tools, advancing at an average of 15 cm per day in the hard rock areas. The workings from this era are narrow and not as high, as the miners were typically not as tall as we are today.

Tunnel16thc

An unusually straight 16th century working, through softer rock – this one is believed to have been exploratory, in search of the extension of the silver vein.

More recent workings were larger in scale, of course, as equipment and blasting were used.

Tunnel19thc

A section of 19th century workings, with supports.

Hoist

19th century hoisting apparatus

The museum at the Tellure interpretation centre includes many artifacts, although the collection of local minerals is currently very basic/elementary. A highlight at the Tellure interpretation centre was a temporary display – this year, a local collector of mining lamps had put on a super exhibit, absolutely first class in all respects.

Miner's Lamp, Saint-Marie-aux-Mines

 In the exhibit, many historical photographs were used together with the lamps, showing the given types of lamps
in use. Featuring the French symbol of the rooster, this lamp was used in the Val d’Argent.

OK, on to the main event – Ste. Marie 2015!

SteMarie

Ste. Marie – the river channel behind buildings and homes.

Of course, as one of the world’s premier mineral shows, Ste. Marie has the strengths that come with this reputation in Mineral World. Top dealers and smaller dealers from all over the world offer specimens of all kinds. In particular, Ste. Marie includes truly stunning thematic displays. At the same time, Ste Marie reflects other regular trends in Mineral World too – scarcity of new material and lots of high prices.

This year the show’s tents and exhibits opened under sunny skies, with lots to look through.

Tents

 One of the many tent “streets”.  There is no grid or obvious pattern to the layout (as it is in the old part of town)
so navigation back to that particular specimen you remember is a good challenge.

Theatre

The theatre rises above the surrounding tents. Hidden in the deepest shadows in the centre of this photo
is Alfredo Petrov, who was visible when I was waiting for the break in pedestrian traffic to take this shot.
Does he not want to be seen? What mineralogical secret has compelled him into the darkness?

If you’ve read other reports of mine from past shows, you may have noticed that I am regularly baffled by the torture to which some mineral specimens are subjected. It’s one thing to toss tumbled agates together, but here is the Ste Marie 2015 winner, for me – the two flats of reddish material at upper right and lower left.

TorturedCuprites

 Yes, this one is pretty low. Those are – or were – cuprite crystals from Rubstovskoe.
Sure, to be fair, they were undoubtedly not the top ones, but there were good
crystals among them and I just can’t see how this could ever be a good idea.

Searching the show, I found a few excellent things.

Despite the host country, the show is truly not full of French mineral specimens, given their relative scarcity. The ones that are there are highly prized. Nonetheless, I was able to acquire a few really interesting French pieces.

There are beautiful deep golden barite crystals from a find at La Côte d’Abot, near Saint Saturnin, Puy-de-Dôme, Auvergne, France. This was in fact a sizeable find however it seems that the pockets were either collapsed or at least partially collapsed well before human eyes ever reached them – many of the broken surfaces have faint recrystallization textures on them.  As in so many cases in mineral collecting, even the most careful of collecting cannot help specimens that were damaged by nature, so I did not acquire many, but the ones I did pick out are very cool specimens. Many demonstrate late-stage layered crystal growth, to create sceptres and capped sections – really neat crystallization patterns on these.

Barite, La Côte d’Abot, Saint Saturnin, Puy-de-Dôme, Auvergne, France

Barite, La Côte d’Abot, Saint Saturnin, Puy-de-Dôme, Auvergne, France – 7.1 cm

Barite, La Côte d’Abot, Saint Saturnin, Puy-de-Dôme, Auvergne, France

Barite, La Côte d’Abot, Saint Saturnin, Puy-de-Dôme, Auvergne, France – 4.3 cm

I also found a small stash of bournonite crystal groups from the contemporary classic locality, Les Malines District, Saint-Laurent-Le-Minier, Gard, Languedoc-Roussillon, France. As with the barites, many of the broken rear surfaces have faint recrystallization textures (and even micro crystals, in some cases) on them, and so again with these pieces there is the problem that many of them detached with just too little that was complete or in excellent condition. I did manage to come up with a very small number of great ones.

Bournonite, Les Malines District, Saint-Laurent-Le-Minier, Gard, Languedoc-Roussillon, France

Bournonite, Les Malines District, Saint-Laurent-Le-Minier, Gard, Languedoc-Roussillon, France – 6.8 cm

Bournonite, Les Malines District, Saint-Laurent-Le-Minier, Gard, Languedoc-Roussillon, France

Bournonite, Les Malines District, Saint-Laurent-Le-Minier, Gard, Languedoc-Roussillon, France – 6.1 cm

From Buxières-les-Mines, there was one fluorite specimen that really caught my eye.  We are used to seeing fluorite from occurrences where the habit is one of stacked cubes, but how often do we get to see stacked dodecahedra?

Fluorite, Buxières-les-Mines, Allier, Auvergne, France

Fluorite, Buxières-les-Mines, Allier, Auvergne, France – field of view approximately 3.0 cm

One last item of interest from France – from an uncommon locality for fine mineral specimens, some brilliant, sharp alpine hematite.

Hematite, L'Alpe d'Huez, Oisans, Isère, France

Hematite with quartz, L’Alpe d’Huez, Oisans, Isère, France – 10.1 cm

Ste Marie regularly includes a large number of sellers from Morocco. However, one really has to dig to find truly excellent specimens – they are few and far between!

Bou Azzer has for many years been known as the locality for the world’s finest erythrite specimens, but specimens are sporadic, and the quality is usually poor (to be fair, this is a very soft mineral and hard to bring from mine to market without damage.) This year a seller had a small lot of erythrite specimens of exceptional quality.

Erythrite1(8.8cm)

 Erythrite, Bou Azzer District, Ouarzazate Province, Morocco – 8.8 cm

Erythrite2(xls to 1cm)

Erythrite, Bou Azzer District, Ouarzazate Province, Morocco – crystals to 1 cm

One other Morocco item – in my Tucson 2015 post, I mentioned some beautiful arite crystals from Bou Nahas. There has been a fair bit more material from this locality, but most of the barite groups and crystals are not particularly distinctive – and in fact I don;t find much of this material to be interesting. However, the isolated crystals and crystal pairs can be pretty special, and I found three more of those at the show – here’s one of them.

BariteBouNahas(5.0)

Barite, Bou Nahas, Oumjrane mining area, Alnif, Er Rachidia, Morocco – 5.0 cm

You may recall that the beautiful yellow stilbite balls from Mali made their debut at Ste Marie last year. There almost none of these in Denver 2014, and I saw no high quality ones in Tucson this year (maybe I missed them?), so I wondered what the story was. Early after my arrival in Ste. Marie, I caught up with the same sellers from last year and went through their specimens. It turns out that the one digging, known simply as Diamonkara, has produced a number of further specimens over the past year, and although most were damaged, I was able to acquire some excellent pieces.

If you read about Diamonkara on my site last year, or if you were in Ste Marie either last year or this year, you may have noted that there has been a push to sell these as specimens of stellerite. When I asked one of the sellers last year as to what had been done to confirm that identification, I was told that “they look like stellerite” (because they often occur in the habit of spherical aggregates). Clearly, that is not enough to label them stellerite – not to mention, there are wheat-sheaf aggregates and individual crystals of this material too.  So yet again this year in Ste Marie, the name stellerite was used. I am aware of one set of analyses that was unable to demonstrate that any of these are in fact stellerite – this is second-hand information, but it is certainly consistent with the prior identifications of stilbite from the deposits of the region.

As for the specimens themselves, the good Diamonkara pieces are absolutely some of the nicest and most distinctive stilbites I’ve ever seen from anywhere, with beautiful colour and form. They are perhaps not yet appreciated for what they are – these are striking display specimens of a mineral that is often pale and drab.

StilbitePrehnite(6cm)

Stilbite, prehnite and epidote from Diamonkara, Bendougou, Kayes Region, Mali – 6 cm

Of all of the minerals that have been caught up in the rise of specimen prices, sadly, elbaite tourmaline stands out. It would be hard not to love a fine tourmaline, but these days it is hard to find excellent quality tourmaline specimens that can be purchased for prices that can be justified by that love. In Ste. Marie I was fortunate to be able to acquire a small number of wonderful-quality specimens from the classic Pakistan locality, Stak Nala. The seller’s family had mined these very recently.

Elbaite Tourmalin, Stak Nala, Pakistan

 Stak Nala, Gilgit-Skardu Road, Northern Areas, Pakistan – 4.5 cm

Moving on from the dealers, the thematic displays this year were spectacular. The theme was minerals of the Alps, and many kinds of mineralogical environments were represented, including the classic alpine deposits and many others situated in the region. Just a couple of photos to give a glimpse:

RedFluorite

Fluorite, Massif de l’Aiguille Verte, Chamonix-Mont Blanc, Haute-Savoie, France – approximately 12 cm.
Collected by J. Couttet in 2004. Now in the Musée des Cristaux in Chamonix.

 Titanite

Group of twinned yellow titanite crystals – approximately 7 cm.

Jordanite

Famous (world’s finest) jordanite crystal from Lengenbach Quarry, Fäld, Finn Valley, Wallis, Switzerland –
approximately 7 cm. British Museum of Natural History collection.

Needless to say, I revisited the display area a few times, just to soak it all in.  The organizers and contributors did an amazing job – thank you!

Until next time, goodbye to the Val d’Argent.

Val d'Argent Val d’Argent, Alsace, France

Posted by: Raymond McDougall on 10.23.2014 | Filed under: Latest, Recent Mineral Updates | Comments (0)

This Mali Update – October 2014 (click here) includes unusually fine balls of radiating green prehnite perched upon sharp, lustrous blocky epidote crystals. The specimens from this particular recent find are better defined and nicer than the typical ones from here. Also in this update are two more of the great yellow stilbites from Diamonkara.

100535(1)

Prehnite on Epidote, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 7.4 cm

Prehnite, Epidote, Mali

Prehnite on Epidote, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 8.3 cm

100541(1)

Prehnite with Epidote, Arrondissement Diako, Cercle de Bafoulabé, Kayes Region, Mali – 6.0 cm

100539(1)

Radiating groups of stilbite crystals, Diamonkara, Bendougou, Kayes Region, Mali – 7.2 cm

Posted by: Raymond McDougall on 07.18.2014 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

Beautiful new specimens from Mali, featuring yellow balls of stilbite crystals from Diamonkara, a new find. The Diamonkara workings are in the same general vicinity of the Arrondissement Diako which has produced the now well-known specimens of prehnite and epidote. Also new among these specimens is an exceptionally fine prehnite on epidote.  These specimens are now posted under Mali – July 2014 Update (click here).

100497(1)

Stilbite with Prehnite and Epidote, Diamonkara, Bendougou, Kayes Region, Mali – 6.9 cm

100494(1)

Stilbite with Prehnite and Epidote, Diamonkara, Bendougou, Kayes Region, Mali – 7.5 cm

100496(1) Stilbite , Diamonkara, Bendougou, Kayes Region, Mali – 6.9 cm

100509(1)

Prehnite on Epidote, Arrondissement Diako, Kayes Region, Mali – 5.9 cm