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Mineral Specimens with Quartz
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5.1 x 1.5 x 0.9 cm. A very nice cluster of three parallel-growth, gemmy and lustrous, watermelon tourmalines crystals from recent finds at the Pederneira Mine. The large, vibrant, cranberry-red/pink core is sheathed in and capped by beautiful, teal-blue tourmaline. The lightly etched, olive-green, pyramidal terminations are striking and the bit of accenting quartz is a nice touch. Complete-all-around, the contacting on one side is out of sight. A beautiful and highly representative watermelon tourmaline from this noted locale.
6.3 x 5.2 x 4.5 cm. This is a fine specimen of Hubnerite from one of the most famous classic Bolivian localities. There are several sharp, lustrous, stubby, black crystals (a very slight red color will appear on the surface of the crystals with strong lighting) of Hubnerite beautifully oriented and intergrown with gem/gemmy Quartz crystals on matrix. These specimens are not common from Siglo Veinte, and this piece is one of the better specimens of the material that I have handled. It is confirmed Hubnerite, not Ferberite. The largest crystal measures 1.5 cm long.
5.7 x 3.8 x 3.0 cm. I know that this specimen looks Peruvian, but it was collected by a personal friend of mine who lives in Alaska and travels by helicopter to the Green Monster every summer to collect Epidotes. He only recently discovered these unique Epidotes which form in "fan"-shaped crystal groups and sometimes in "jackstraw" groups as well. Those of you visited the "American Treasures" display at Tucson might have seen a few of these unusual Epidotes on display in the "Green Monster Mountain" case. This piece comprises deep green, highly lustrous, translucent, thin, prismatic crystals of Epidote in a "fan"-shaped aggregate. The final touch to this specimen is a few associated sharp, gemmy, lustrous Quartz crystals. A very interesting U.S. Epidote specimen from what I was told was a one time find.
MD-278453 - Sphalerite, Chalcopyrite, Quartz, Calcite, Epidote - - Archived
Camp Bird Mine, Ouray, Sneffels District (Mount Sneffels District), Ouray Co., Colorado, USA
small cabinet, 5.7 x 5.2 x 3.4 cm.
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5.7 x 5.2 x 3.4 cm. The Camp Bird mine near Ouray, Colorado is one of the most classic of all the Colorado ore body localities. It is renowned for its superb sulfide specimens. This specimen features superb quality, sharp, lustrous, jet-black crystals of Sphalerite up to 1.1 cm across associated with bright metallic Chalcopyrite plus gemmy Quartz crystals. The underside of the specimen is filled with micro olive-green Epidote and small white crystal groups of scalenohedral Calcite. This is a superb Sphalerite from this most classic of San Juan localities. These specimens are impossible to obtain these days, and are regarded among Colorado collectors as some of the best from the state. This piece came to Rich Kosnar from noted Colorado collector, George Robertson. From the 500 stope, 2100' level.
5.3 x 4.2 x 3.6 cm. A group of rich pink, translucent, lustrous, hexagonal Beryl (var: "Morganite") crystals sit atop a matrix of off-white blocky Albite (var "Cleavelandite") crystals with Quartz and minor Muscovite and Schorl. The largest Morganite crystal measures 2.6 cm across, but please note that the back of the crystal group is contacted. A very attractive and well crystallized display specimen of this classic pegmatite material.
4.7 x 2.3 x 1.7 cm. Despite the fact that the Tourmaline group comprises more than a dozen species, and Tourmalines occur in virtually every color of the rainbow, yellow is one of the most rare and highly sought after colors for specimens. This specimen is one of the most interesting, unique and uncharacteristic Tourmalines that I have seen from virtually any world locality. This specimen was in the collection of Richard Kosnar, who purchased it from New Jersey mineral dealer Rick Smith in the early 1980s. It features a pair of very sharp, highly lustrous, thin, prismatic, GEM/gemmy, multicolored crystals of Tourmaline on a single very slightly smoky color Quartz crystal with minor Albite. Matrix specimens from Stak Nala aren't terribly common, but it's the coloration of the crystals that makes this piece so unusual. The smaller of the Tourmaline crystals has a rich olive-green to black color at the base with a bright pink termination, but the larger crystal has a very unique yellow zone spanning over 2 cm of this 4.7 cm crystal with the same olive-green and pink zones as the smaller one. Another impressive aspect of this piece is the fact that the terminations are highly lustrous, and not at all dull like so many Tourmalines from Stak Nala.
15.3 x 4.2 x 3.4 cm. Gemmy and lustrous, burnt orange spessartine garnets to 5 mm are festooned on all sides of the fine large cabinet smoky quartz crystal from recent finds at Tongbei, China. The glassy smoky is transparent to translucent. Very interestingly, the water-clear termination is garnet-free, but has included garnets and preferentially frosted faces. The termination is very nearly pristine. A striking, highly representative large combination material from this noted locale.
11.2 x 8.5 x 5.2 cm. A beautiful and striking cabinet specimen from a new find in an uncommon Chinese locale - Yuncheng Prefecture, Shanxi Province. Glassy, sharp quartz crystals are included with vibrant, brick-red hematite. The tinted crystals reach 2.0 cm on this piece and rest on milky quartz matrix. Two crystal faces are preferentially included with contrasting, pastel-green chlorite, for a nice accent. These look very similar to the classic hematite-included amethyst crystals from Thunder Bay, Ontario. Impressive new material to the market only in the end of 2009.
8.5 x 5.4 x 2.6 cm. A beautiful and aesthetic combination specimen from the San Antonio Mine at Santa Eulalia and the Consie Prince Collection. Scintillating drusy quartz covers the multitude of rhodochrosite rhombs that fill the superbly placed vug in very sculptural, Chinese dhow ship-like sulfide ore matrix. There are even a couple of water-clear quartz crystals scattered about. Classic and very showy material from this well-known mine. Old, and seldom seen in this quality of specimen today.
8.7 x 2.0 x 1.4 cm. A striking and beautiful amethyst quartz scepter from recent finds in the Goboboseb Mountains. This fine piece is very glassy and totally water-clear. The elongated scepter, impressive skeletal features, shading variations of the amethyst and clay inclusions are highly noteworthy. Complete-all-around and very nearly pristine. This is an excellent, above average example of sceptered Brandberg amethyst with a large scepter.
7.9 x 7.0 x 4.5 cm. This specimen is a very rich plate of emeralds embedded in massive quartz matrix, with a thin coating of mica-schist on the exposed upper surface where the emeralds pop out of the quartz. This specimen is unusual in that most of the pieces now brought to market from this mine have either quartz or mica but not both on the same specimen, indicating perhaps this was at the boundary layer of the two types of deposition. Overall, it is very 3-dimensional and very colorful. The large crystal atop is naturally distorted, "bent," a rare phenomenon in beryls. It is nearly 4 cm long, and is not repaired. It has a lustrous termination, though with minor edge wear around the rim. In person these are a more vibrant green, but come across darker in the photo than in real life. When backlit they practically glow. This is one of the richest specimens I have seen from these new finds, in terms of overall concentration and mass of emeralds on one plate. Admittedly, the specimen production from here is not very much in terms of quantity yet (and perhaps never will be), but of that production I have seen most of what was prepared in the last year as the mine finally made a specimen-preparation deal to get them out to our market - from that sample, this was fairly impressive for overall impact and concentration.
6.8 x 5.8 x 2.0 cm. While there were perhaps (only!) several dozen specimens recovered that featured large crystals in matrix, from what I saw of the find, most were repaired at least once if not more - and few had such nice aesthetics as this one. The large central crystal on this expertly trimmed matrix is 6.5 cm tall. It is 1.3 cm wide and 8 mm in depth. This piece stood out to my eye because it has a very good size (for any emerald locale) and is tremendously aesthetic, yet miraculously has no repairs. It has a natural tectonic break: here, the crystal broke in geologic time, in situ; and the gap between was filled with later quartz deposition. By careful preparation, the specimen has been preserved on a solid matrix plate of quartz with mica schist on the rear side. Frankly, I am not as much shocked they got it out in one piece, but that the termination was able to be so well-excavated from the surrounding matrix as to be freestanding ( at some risk). The freestanding tip extends about an inch over the matrix rim, now. The crystal is transparent to translucent through its length, though mostly at the top. For this find, the termination is quite good - sharp and even, without etching or damage. This specimen has fine lustre, and a characteristic deep forest-green color this mine is known for (quite darker than most Colombian material).
4.6 x 3.0 x 3.0 cm. This specimen features a 4.6 x 1.3 x 1.1 cm emerald of deep evergreen color, on quartz. As with most emeralds from this mine, the surface is a little rough and pitted compared to Colombian emeralds. This piece was chosen for its very fine exposure, showing the whole crystal and a freestanding termination. The termination is slightly asymmetric, but is complete. The color is very dark, but still the piece is quite translucent and even transparent in zones.
3.8 x 2.8 x 1.4 cm. Few Kagem emerald crystals were as gemmy and lustrous as Colombian pieces, but this comes as close as any I saw in the new finds. It is a very transparent crystal, perched in a rare crystallized quartz matrix (at least, the quartz has some surviving faces on the front, though is massive on back). The emerald itself is 34 x 11 x 8mm in size. The termination looks complete but on close inspection admittedly has some minute edge wear (as do many from these finds). It is nicely freestanding and displays well, and is a choice miniature from this interesting new specimen locality.
3.0 x 2.7 x 2.6 cm. In some ways, this was my favorite of the emeralds available from the first specimen production out of this world-famous gem mine, for its overall quality and aesthetics. The knoll of quartz matrix features a sharp and very equant, 2.6-cm-long emerald perched atop its natural pedestal. Remarkably, it was excavated without it falling out and needing repairs. It is nestled, still, securely in the quartz which once enclosed (and protected) the crystal. The top termination is very fine and sharp. The lower termination is not lustrous, but is nevertheless complete. It has a consistent, rich, evergreen color, darker than most Colombian emeralds and so distinct. It has better lustre and sharper form, than most Kagem pieces I have now seen.
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Rob Lavinsky, rob@irocks.com
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Mineral Specimens by species; or
by specimen id.
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![Sphalerite, Chalcopyrite, Quartz, Calcite, Epidote from Camp Bird Mine, Ouray, Sneffels District (Mount Sneffels District), Ouray Co., Colorado, USA [db_pics/mdpics/MD-278453b.jpg]](db_pics/mdpics/MD-278453b.jpg)
![Sphalerite, Chalcopyrite, Quartz, Calcite, Epidote from Camp Bird Mine, Ouray, Sneffels District (Mount Sneffels District), Ouray Co., Colorado, USA [db_pics/mdpics/MD-278453c.jpg]](db_pics/mdpics/MD-278453c.jpg)
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![Beryl (Var: Morganite), Albite, Quartz, Schorl, Muscovite from Mawi pegmatite, Laghman (Lagman; Nuristan) Province, Afghanistan [db_pics/mdpics/MD-278464a.jpg]](db_pics/mdpics/MD-278464a.jpg)
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![Spessartine, Quartz (Var: Smoky Quartz) from Wushan Spessartine Mine, Tongbei, Yunxiao Co., Zhangzhou Prefecture, Fujian Province, China [db_pics/mdpics/MD-278492a.jpg]](db_pics/mdpics/MD-278492a.jpg)
![Quartz, Hematite from Yuncheng Prefecture, Shanxi Province, China [db_pics/mdpics/MD-278495a.jpg]](db_pics/mdpics/MD-278495a.jpg)
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![Quartz (Var: Amethyst) from Goboboseb Mountains, Brandberg area, Brandberg District, Erongo Region, Namibia [db_pics/mdpics/MD-278498a.jpg]](db_pics/mdpics/MD-278498a.jpg)
![Beryl (Var: Emerald), Quartz from Kagem Emerald Mine, Kafubu Emerald District, Ndola, Copperbelt Province, Zambia [db_pics/mdpics/MD-279095a.jpg]](db_pics/mdpics/MD-279095a.jpg)
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