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Mineral Specimens with Quartz
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18.4 x 5.0 x 4.8 cm. A very large, perfectly symmetrical stalactite of amethyst, with sparkly crystals all around - no attachments, damage or dings! Where it was sliced off on the bottom, it has been polished, so you can clearly see the concentric deposition rings and radial crystal growth. Very impressive!
14.9 x 13.2 x 10.5 cm. A fabulous large quartz specimen, with so much interesting stuff going on in a single specimen! It mixes in an even balance two completely different forms of quartz crystal - the typical prism, and thin, tabular crystals. But besides that, there are several fine Japan-Law twins here - AND very clear PHANTOMS inside most of the tabular crystals!! This would be pretty as just a quartz specimen, but with the mix of forms, the phantoms, and the Japan-Law twins, it is truly exceptional!
21.4 x 15.2 x 11.9 cm. If this were "just" a large cluster of amethyst crystals, it would still be remarkable - because the top quality crystals from Uruguay can beat just about any for gemminess, intense purple color, and glassy luster. But the reason Ed David had it probably did not have to do with these qualities - it is these amazing perfectly circular spots of milky-white quartz speckling the crystal faces. At first glance, they appear to be perhaps etched holes in the surface of the crystals. But they are not - they are absolutely smooth and lustrous, just like the rest of the crystal faces. They look like little discs that have been embedded in the surface. These strange spots turn a gorgeous large amethyst specimen into a gorgeous and UNIQUE one!
7.8 x 7.2 x 4.2 cm. A cluster of amethyst crystals wrapped in sparkly orange citrine crystals, from Magaliesberg. The gemmy purple tips of the amethyst crystals providing a beautiful color contrast with the citrine below.
13.9 x 9.3 x 7.4 cm. Another uncommon mineral from the Daye Mine is this cluster of pretty sceptres of amethyst, on a matrix of calcite and quartz. The amethysts have a light pastel lavender blush, with very sharp and glassy faces. They measure to around 2 cm.
12.9 x 10.4 x 5.9 cm. I had to look closely at this specimen to really believe that it is from Arkansas - but it is, and as such, it is truly rare and sensational! As you know, Arkansas has produced very few smoky specimens, and vanishingly few of this quality and size. But the proof that this is natural and not heated is in the little microcrystals of clear quartz that grew in a secondary generation on two of the faces of the large crystal. Ex. Rebecca Stewart Collection.
16.1 x 11.2 x 7.0 cm. Here is a large and pretty old Colorado pseudomorph, not common at all on the market these days! It is an Ouray quartz-after-calcite, with the sparkly quartz microcrystals having covered and partly replaced the underlying "fingers" of calcite. This is a floater specimen, beautiful all the way around and actually displayable from either side. Ex. Ed David Collection.
17.9 x 11.6 x 10.0 cm. A big show-stopper of a specimen featuring a very large compound tourmaline crystal that has grown right on the side of a huge, gemmy quartz crystal! Though the specimen could not be removed from the pocket with the termination of the tourmaline intact (the bottom of the tourmaline and the quartz is the matrix contact), it is nevertheless quite a sensational specimen. The tourmaline is gemmy, with wonderful green color, and measures a very impressive 11 cm, top to bottom! It is actually a compound crystal made up of several intergrown crystals, and the terminations of these subordinate crystals ARE all complete - the only one missing is the main one - presumably the top end of the crystal contacted the pocket wall and therefore could not be removed complete. The tourmaline is just so striking against the backdrop of this giant quartz crystal - wow!
11.9 x 10.4 x 2.7 cm. Shiny-metallic crystals of galena to 2.5 cm, on a bed of quartz crystals, with little golden chalcopyrites sprinkled here and there. Note the very interesting modifications on the isometric habit, with beveled corners, and even a triangular crystal!
15.0 x 11.1 x 7.9 cm. This large and fascinating old English specimen came out of the collection of Gene Meieran, and evidently was in an old German collection at one point before that. On one side is black specular crystalline hematite with a few isolated smoky quartz crystals sticking out of it. On the other side is a bed of large quartz crystals. And along one side of the specimen is hematite of the other characteristic form for this area, called "kidney ore" hematite. Three specimens in one!
6.4 x 6.1 x 4.1 cm. A specimen from the exciting find of amethyst in Georgia, first introduced to the market about two years ago. The quality of these is very good for American amethyst, which is not common in the first place these days, and is the reason the specimens from this find seem so expensive for "just amethyst."
2.2 x 2.2 x 1.3 cm. Gemmy Aqua 1.5 cm long, deep gemmy brown, bifurcating smoky quartz crystal into two excellent terminations. The luster on the Aqua is excellent and very good on the smoky. The termination of the Aqua is excellent, and looking down you can see all the way to the contacted base. A terrific thumbnail.
4.1 x 4 x 3.6 cm. Very nice Fluorite specimen with three generations of growth, starting with beautiful apple-green octahedrons and ending with heavily modified cube/octahedral crystals on the corners of each original crystal. The luster is good, the color is good, and the crystal habits are intriguing.
8.7 x 8.3 x 3.2 cm. Lovely series of intergrown Fluorite balls averaging about .5 cm in size. The Fluorites are all translucent, have a beautiful honey color and a rich silky luster. The Fluorites rest on a beautiful matrix of drusy quartz on a blue chalcedony, giving the piece incredible aesthetics.
9.5 x 7.7 x 3.1 cm. Very nice series of light green translucent prehnites growing in a radial pattern. This habit creates attractive fans or balls that range up to about 1.3 cm across. Much better in person. The quartz is unusual in association for the locale.
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Rob Lavinsky, rob@irocks.com
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share specimen![Quartz (Var: Amethyst) from Artigas, Artigas Department, Uruguay [db_pics/mdpics/MD-114501a.jpg]](db_pics/mdpics/MD-114501a.jpg)
![Quartz from Minas Gerais, Southeast Region, Brazil [db_pics/mdpics/MD-114504a.jpg]](db_pics/mdpics/MD-114504a.jpg)
![Quartz (Var: Amethyst) from Artigas, Artigas Department, Uruguay [db_pics/mdpics/MD-114506a.jpg]](db_pics/mdpics/MD-114506a.jpg)
![Quartz (Var: Citrine), Quartz (Var: Amethyst) from Boekenhoutshoek area (Boekenhouthoek), Mkobola district, Mpumalanga Province, South Africa [db_pics/mdpics/MD-114543a.jpg]](db_pics/mdpics/MD-114543a.jpg)
![Quartz (Var: Amethyst) from Fengjiashan Mine (Daye Copper mine), Edong Mining District, Daye Co., Huangshi Prefecture, Hubei Province, China [db_pics/mdpics/MD-114557a.jpg]](db_pics/mdpics/MD-114557a.jpg)
![Quartz (Var: Smoky Quartz) from North shore, Lake Ouachita, Garland Co., Arkansas, USA [db_pics/mdpics/MD-114604a.jpg]](db_pics/mdpics/MD-114604a.jpg)
![Quartz, Calcite from Ouray District (Uncompahgre District), Ouray Co., Colorado, USA [db_pics/mdpics/MD-114611a.jpg]](db_pics/mdpics/MD-114611a.jpg)
![Elbaite, Quartz from Minas Gerais, Southeast Region, Brazil [db_pics/mdpics/MD-114612a.jpg]](db_pics/mdpics/MD-114612a.jpg)
![Galena, Quartz from Krushev dol deposit, Krushev dol mine, Madan ore field, Rhodope Mts, Smolyan Oblast, Bulgaria [db_pics/mdpics/MD-114620a.jpg]](db_pics/mdpics/MD-114620a.jpg)
![Hematite, Quartz from Frizington, West Cumberland Iron Field, North and Western Region (Cumberland), Cumbria, England, UK [db_pics/mdpics/MD-114625a.jpg]](db_pics/mdpics/MD-114625a.jpg)
![Quartz (Var: Amethyst) from Jacksons Crossroads, Wilkes Co., Georgia, USA [db_pics/mdpics/MD-114629a.jpg]](db_pics/mdpics/MD-114629a.jpg)
![Beryl (Var: Aquamarine), Quartz (Var: Smoky Quartz) from Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, Namibia [db_pics/mdpics/MD-117499a.jpg]](db_pics/mdpics/MD-117499a.jpg)
![Fluorite, Quartz from Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, Namibia [db_pics/mdpics/MD-117501a.jpg]](db_pics/mdpics/MD-117501a.jpg)
![Fluorite, Quartz, Quartz (Var: Chalcedony) from Mahodari, Nasik District, Maharashtra, India [db_pics/mdpics/MD-117561a.jpg]](db_pics/mdpics/MD-117561a.jpg)
![Prehnite, Quartz from Brandberg area, Brandberg District, Erongo Region, Namibia [db_pics/mdpics/MD-117564a.jpg]](db_pics/mdpics/MD-117564a.jpg)