Selected Specimens

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C269 - color change Dravite $ 200
Nchongo, Umba Valley, Tanzania
thumbnail - 1.3 x 1.1 x 1 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c269a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c269b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality.Transparent red with strong backlighting.


C271 - color change Dravite $ 250
Nchongo, Umba Valley, Tanzania
thumbnail - 1.6 x 1.4 x 1.2 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c271a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c271b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality. One chip on the termination.Transparent red with strong backlighting.


C272 - color change Dravite $ 150 DISCOUNTED 40% OFF TO $ 90
Nchongo, Umba Valley, Tanzania
thumbnail - 1 x 0.9 x 0.8 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c272a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c272b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality.Transparent red with strong backlighting.


C274 - Axinite $ 350
Pinos Altos, Baja Sur, Mexico
small cabinet - 6 x 5 x 5 cm


Axinite from Pinos Altos, Baja Sur, Mexico [db_pics/pics/c274a.jpg] Axinite from Pinos Altos, Baja Sur, Mexico [db_pics/pics/c274b.jpg] Axinite from Pinos Altos, Baja Sur, Mexico [db_pics/pics/c274c.jpg] Axinite from Pinos Altos, Baja Sur, Mexico [db_pics/pics/c274d.jpg]

Purple Axinite crystals intergrown with transparent Calcite crystals from an obscure Baja locality. Fine quality mound of crystals that is very hard to find and a must for a Baja or Mexican collection.


C276 - Boleite $ 500
Amelia Mine, Santa Rosalia, Baja Sur, Mexico
miniature - 3.5 x 3 x 2.5 cm


Boleite from Amelia Mine, Santa Rosalia, Baja Sur, Mexico [db_pics/pics/c276a.jpg] Boleite from Amelia Mine, Santa Rosalia, Baja Sur, Mexico [db_pics/pics/c276b.jpg] Boleite from Amelia Mine, Santa Rosalia, Baja Sur, Mexico [db_pics/pics/c276c.jpg]

Cluster of Boleite cubes on matrix. Main crystal is a relatively large 1.1cm on the diagonal.


C277 - Epidote $ 200
San Quintin, Baja Norte, Mexico
miniature - 4 x 2.5 x 2.5 cm


Epidote from San Quintin, Baja Norte, Mexico [db_pics/pics/c277a.jpg] Epidote from San Quintin, Baja Norte, Mexico [db_pics/pics/c277b.jpg] Epidote from San Quintin, Baja Norte, Mexico [db_pics/pics/c277c.jpg]

A Baja classic specimen featuring a blocky 2cm Epidote crystal on matrix. The crystal is contacted on the backside, but the front is sharp and lustrous and it's double terminated. These are old, hard to come by specimens that only turn up when collections are recycled.


C278 - Calcite $ 280
Zacatecas, Mexico
miniature - 5 x 3.5 x 3.3 cm


Calcite from Zacatecas, Mexico [db_pics/pics/c278a.jpg] Calcite from Zacatecas, Mexico [db_pics/pics/c278b.jpg] Calcite from Zacatecas, Mexico [db_pics/pics/c278c.jpg]

Cluster of clear, transparent scalenohedral Calcite crystals, some with black inclusions. Bright and showy.


C279 - Cinnabar $ 450 DISCOUNTED 40% OFF TO $ 270
Red Bird Mine, Antelope Springs District, Pershing Co., Nevada, USA
cabinet - 9.5 x 5 x 4.5 cm


Cinnabar from Red Bird Mine, Antelope Springs District, Pershing Co., Nevada, USA [db_pics/pics/c279a.jpg] Cinnabar from Red Bird Mine, Antelope Springs District, Pershing Co., Nevada, USA [db_pics/pics/c279b.jpg] Cinnabar from Red Bird Mine, Antelope Springs District, Pershing Co., Nevada, USA [db_pics/pics/c279c.jpg] Cinnabar from Red Bird Mine, Antelope Springs District, Pershing Co., Nevada, USA [db_pics/pics/c279d.jpg]

Deep red, translucent twinned Cinnabar crystals on matrix associated with Quartz crystals. Hard to find specimen from an uncommon old locality.


C280 - Wulfenite with Mimetite $ 250
Rowley Mine, Maricopa Co., Arizona, USA
thumbnail - 3 x 2.8 x 2 cm


Wulfenite with Mimetite from Rowley Mine, Maricopa Co., Arizona, USA [db_pics/pics/c280a.jpg] Wulfenite with Mimetite from Rowley Mine, Maricopa Co., Arizona, USA [db_pics/pics/c280b.jpg] Wulfenite with Mimetite from Rowley Mine, Maricopa Co., Arizona, USA [db_pics/pics/c280c.jpg]

Orange Wulfenite crystal on matrix associated with Mimetite. Wulfenite crystals reach 1cm in size.


C281 - Axinite on Arsenopyrite $ 200
Colebrook Hill Mine, Dundas, Tasmania, Australia
small cabinet - 6.5 x 5 x 4 cm


Axinite on Arsenopyrite from Colebrook Hill Mine, Dundas, Tasmania, Australia [db_pics/pics/c281a.jpg] Axinite on Arsenopyrite from Colebrook Hill Mine, Dundas, Tasmania, Australia [db_pics/pics/c281b.jpg] Axinite on Arsenopyrite from Colebrook Hill Mine, Dundas, Tasmania, Australia [db_pics/pics/c281c.jpg] Axinite on Arsenopyrite from Colebrook Hill Mine, Dundas, Tasmania, Australia [db_pics/pics/c281d.jpg]

Open vug in a matrix of solid Arsenopyrite lined with crystals of Arsenopyrite, upon which grew purple Axinite crystals.


C282 - Ilmenite $ 400
Kragero Ilmenite Mines, Kragero, Norway
miniature - 4.4 x 3 x 2.8 cm


Ilmenite from Kragero Ilmenite Mines, Kragero, Norway [db_pics/pics/c282a.jpg] Ilmenite from Kragero Ilmenite Mines, Kragero, Norway [db_pics/pics/c282b.jpg] Ilmenite from Kragero Ilmenite Mines, Kragero, Norway [db_pics/pics/c282c.jpg]

Single Ilmenite crystal with a metallic grey/black color. Ex. Scott Williams with 2 old labels.


C284 - Cinnabar in Calcite $ 600
Terlingua, Brewster Co., Texas, USA
thumbnail - 2.8 x 1.8 x 1.5 cm


Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284a.jpg] Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284b.jpg] Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284c.jpg]

Single yellow scalenohedral Calcite crystal with a sharp phantom of Cinnabar. This is a rare specimen from the old mercury mining district of Terlingua, located near the Mexican border. Cinnabar was discovered here in the 1880s, creating a temporary mining town, now nothing remains but a ghost town.


C285 - Cinnabar in Calcite $ 400
Terlingua, Brewster Co., Texas, USA
miniature - 3.8 x 1.6 x 1.3 cm


Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c285a.jpg] Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c285b.jpg]

Single yellow scalenohedral Calcite crystal with a sharp phantom of Cinnabar. This is a rare specimen from the old mercury mining district of Terlingua, located near the Mexican border. Cinnabar was discovered here in the 1880s, creating a temporary mining town, now nothing remains but a ghost town.


C286 - Diaspore $ 950
Aydun, Mugula, Turkey
miniature - 4 x 2.5 x 1.1 cm


Diaspore from Aydun, Mugula, Turkey [db_pics/pics/c286a.jpg] Diaspore from Aydun, Mugula, Turkey [db_pics/pics/c286b.jpg] Diaspore from Aydun, Mugula, Turkey [db_pics/pics/c286c.jpg]

Bright and gemmy V-twin crystal of Diaspore. This is about as free of damage as they get, with both tips undamaged with natural tapering terminations or possibly with flat contact faces on parts. It's also very glassy and bright with lots of internal transparency.


C287 - Fluorite with Scheelite $ 350
Quan Zhou, Fujian Prov., China
small cabinet - 6 x 5 x 4 cm


Fluorite with Scheelite from Quan Zhou, Fujian Prov., China [db_pics/pics/c287a.jpg] Fluorite with Scheelite from Quan Zhou, Fujian Prov., China [db_pics/pics/c287b.jpg] Fluorite with Scheelite from Quan Zhou, Fujian Prov., China [db_pics/pics/c287c.jpg]

Deep purple Fluorite crystals to 2.8cm on matrix associated with Scheelite crystals and Calcite. The Scheelite crystals reach 1cm in size.



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13 14 15 16 17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70 71 72
73 74 75 76 77 78 79 80 81 82 83

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