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Mineral Specimens with Calcite
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9.2 x 7.1 x 5.7 cm. Boltwoodite is a rare potassium sodium uranyl silicate. This fine specimen features a well-placed, 3.8 cm vug highlighted with radial clusters of super-bright, lemon-yellow boltwoodite needles. The vug is lined with smoky-brown calcite scalenohedrons and the boltwoodite clusters surround a 1.7 cm, lustrous, colorless calcite scalenohedron. Ex. Rob Smith Collection.
6.7 x 4.1 x 2.2 cm. A locality specimen from this classic Wisconsin locality circa mid-1800s , in all likelihood. This is a pseudomorph of Smithsonite, having replaced calcite crystals. Ex. Philadelphia Academy of Sciences Collection.
6.9 x 4.9 x 4.9 cm. This fine Tsumeb calcite specimen features two large, sharp, transparent calcite rhombohedrons, on two intergrown shards of matrix that serve as a perfect base for the calcites, and add an attractive touch in that they actually show through the calcites to add color (the reddish color is from hematite). The calcites measure to 5 cm tip-to-tip.
10.4 x 6.8 x 4.3 cm. A fine Tsumeb calcite, featuring razor-sharp, intergrown rhombs, reaching to 5 cm, tip-to-tip. The calcites have been coated with an iron-rich mineral, giving them a variegated surface of light to dark brown.
6.8 x 5.4 x 5.4 cm. A huge, stunningly lustrous compound crystal of sphalerite, with associated calcite, from Mexico. Look at the sharpness of these highly reflective, twinned faces. Ex. Charles Hansen Collection.
7.9 x 6.6 x 4.8 cm. Here is a Daye Copper Mine calcite specimen that you would never guess is from the same mine as, for example, the little clear diamond-shaped ones. This is a beautiful burst of light orange-yellow crystals, sprouting out in every direction. They have a fine reflective luster.
11.6 x 8.5 x 2.9 cm. A fine cabinet plate of water-clear, glassy needle quartz crystals nicely accented with a scattering of lustrous, lightly iridescent, brassy chalcopyrite plates and milky calcite scalenohedrons from the famous Campbell Shaft at Bisbee. Ex. Smith (Rocksmiths) and Dave Stoudt Collections. According to Dave Stoudt’s catalogue, he bought this piece from the Smiths in 1989.
9.7 x 8.0 x 7.5 cm. A striking and classic, cave calcite specimen from the Southwest Mine at Bisbee. This complete all-around piece is a dense "forest" of lustrous, translucent, pastel-green, arborescent calcite scalenohedrons. The green tinting is due malachite. Ex. Stoudt Collection. The previous dealer label states that the piece was collected in the mid-1940s.
8.1 x 4.2 x 3.6 cm. This fine, sceptered calcite specimen from Villabona, Spain looks just like a classic, old-time specimen of sceptered calcite from the Blackstone Mine, Shullsburg, Wisconsin. The three-sided, translucent, gray scalenohedron is abundantly overgrown with lustrous 1 mm - 6 mm rhombohedral calcites in parallel stair-stepped growth. The scalenohedron is capped by a lighter gray, transparent and lustrous 3.4 cm complex rhombohedral calcite crystal.
14 x 7.5 x 5.8 cm. A stunning, gemmy, golden twinned crystal of calcite form the Elmwood Mine. What makes this very big crystal so good, in addition to the fine clarity and glassy luster, is that the terminations have only the slightest few bits of hardly eye-visible edge-wear. It has intense color and very good gemminess as well. The other thing that makes this crystal remarkable is the magnificent multiple sub-terminations at one end – a dozen of them, in fact.
An unusually sharp, glassy and transparent calcite for India, from the Meieran Collection. The crystal does have some face and edge wear, but all the faces on the display side are complete (the back side is a clean cleave from removal from matrix). 7.3 x 5 x 3.3 cm
6.1 x 5 x 3.5 cm. A superb piece composed of lovely pink plumose sprays (up to 1 cm long) of Manganoan calcite on a first generation of dense, deeper pink acicular crystals (that are probably kutnohorite). Superb fluorescence. Ex. Charlie Key.
6.7 x 4.2 x 2.5 cm. An unusual locality piece…a plate of Erongo garnets. Large (up to 1.7 cm) purple-red Grossular Garnets embedded in Calcite. Additionally, the garnets have a complex, and very attractive, striation pattern very similar to those that have come out of China in the last decade, along with good luster. Ex. Charlie Key.
4.4 x 3.3 x 2.5 cm. A superb and extremely rare pearly, silver-blue Celestine on matrix. The luster is incredible. I have not seen Celestine with this particular habit (fine blades rotated through spheres) set on Calcite rhombs. Ex. Charlie Key.
10.8 x 7.1 x 6.2 cm. The original, large scalenohedral crystals of calcite are now completely gone, etched away by corrosive solutions in the pocket, while the orangey covering quartz retains their sharp shape. If you flip this specimen over, or look through the missing tip of one of the pseudormorphs, you can see that the specimen is hollow inside. To make it even more interesting, a later generation of calcite crystals has formed on the outside of the quartz - so it is calcite, on quartz, on now-missing calcite. Ex. Richard Hauck Collection.
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Rob Lavinsky, rob@irocks.com
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share specimen![Boltwoodite, Calcite from Rössing Mine, Arandis, Swakopmund District, Erongo Region, Namibia [db_pics/mdpics/MD-199616a.jpg]](db_pics/mdpics/MD-199616a.jpg)
![Boltwoodite, Calcite from Rössing Mine, Arandis, Swakopmund District, Erongo Region, Namibia [db_pics/mdpics/MD-199616b.jpg]](db_pics/mdpics/MD-199616b.jpg)
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![Sphalerite, Calcite from Naica, Mun. de Saucillo, Chihuahua, Mexico [db_pics/mdpics/MD-200556a.jpg]](db_pics/mdpics/MD-200556a.jpg)
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![Quartz, Chalcopyrite, Calcite from Campbell Mine (Campbell shaft), Bisbee, Warren District, Mule Mts, Cochise Co., Arizona, USA [db_pics/mdpics/MD-200661a.jpg]](db_pics/mdpics/MD-200661a.jpg)
![Quartz, Chalcopyrite, Calcite from Campbell Mine (Campbell shaft), Bisbee, Warren District, Mule Mts, Cochise Co., Arizona, USA [db_pics/mdpics/MD-200661b.jpg]](db_pics/mdpics/MD-200661b.jpg)
![Calcite, Malachite from Southwest Mine, Bisbee, Warren District, Mule Mts, Cochise Co., Arizona, USA [db_pics/mdpics/MD-200664a.jpg]](db_pics/mdpics/MD-200664a.jpg)
![Calcite from Villabona mining area, Asturias, Spain [db_pics/mdpics/MD-200678a.jpg]](db_pics/mdpics/MD-200678a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-200983a.jpg]](db_pics/mdpics/MD-200983a.jpg)
![Calcite from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-20127a.jpg]](db_pics/mdpics/MD-20127a.jpg)
![Calcite (Var: Manganoan Calcite) from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-201320a.jpg]](db_pics/mdpics/MD-201320a.jpg)
![Calcite (Var: Manganoan Calcite) from N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-201320b.jpg]](db_pics/mdpics/MD-201320b.jpg)
![Grossular, Calcite from Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, Namibia [db_pics/mdpics/MD-201324a.jpg]](db_pics/mdpics/MD-201324a.jpg)
![Celestine, Calcite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-201363a.jpg]](db_pics/mdpics/MD-201363a.jpg)
![Celestine, Calcite from Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa [db_pics/mdpics/MD-201363b.jpg]](db_pics/mdpics/MD-201363b.jpg)
![Quartz, Calcite from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-201599a.jpg]](db_pics/mdpics/MD-201599a.jpg)