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Mineral Specimens with Calcite
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15.6 x 7.7 x 4.5 cm. Few large specimens of any quality were recovered from this find, or rather trickle of small pockets over this past summer (May and July 2009). Here is a rare, dramatic large specimen that is so colorful it looks artificial. Emplaced on a vein portion of limonite matrix are intergrown crystals of glassy and translucent, rhombohedral calcite, to 1.25 cm across. What really makes this special are the rich inclusions of aurichalcite investing into the calcite rhombs, resulting in the most beautiful teal color. Some aurichalcite remains free of the calcites, as bunches of tightly packed crystals amidst the rhombs. When closely examining the calcite, it is possible to see the fibrous aurichalcite crystals preserved inside, thus showing that this is intergrowth, as much or more so than simple inclusions. Some crystals of calcite may be more aurichalcite than calcite now. The color is, truly, mesmerizing. The color and lustre both are better in person because we had the camera compromise to try to get each in some degree.
5.8 x 4.5 x 3.9 cm. Two well-formed rhombs of calcite, to 1.75 cm across, which are heavily invested with fibrous aurichalcite, site nicely in this vug. The crystals are glassy and translucent to transparent, with an exceptional teal color.
4.7 x 3.6 x 2.2 cm. Perched on a small amount of limonite matrix is a cluster of intergrown, glassy and translucent calcite rhombs, to 1.35 cm across. They are heavily included by fibrous aurichalcite, giving the specimen a rich, teal color. This is one of the richest overall plates of solid colored crystals from the find. When closely examining the calcite, it is possible to see the fibrous aurichalcite crystals preserved inside, thus showing that this is intergrowth, as much or more so than simple inclusions. Some crystals of calcite may be more aurichalcite than calcite now. The color is, truly, mesmerizing. The color and lustre both are better in person because we had the camera compromise to try to get each in some degree.
4.4 x 2.8 x 2.0 cm. In the center of this matrix specimen is a large, rather equant rhomb of glassy and translucent calcite, measuring 1.9 cm across. It has been mostly included by fibrous aurichalcite, exhibiting a spectacular, teal blue color. The top left termination is gemmier due to a smaller amount of aurichalcite and thus more transparency to the calcite. This is a stark and dramatic miniature. When closely examining the calcite, it is possible to see the fibrous aurichalcite crystals preserved inside, thus showing that this is intergrowth, as much or more so than simple inclusions. Some crystals of calcite may be more aurichalcite than calcite now. The color is, truly, mesmerizing. The color and lustre both are better in person because we had the camera compromise to try to get each in some degree.
6.8 x 5.3 x 2.8 cm. An unusual piece. Intergrown, thin, disc-like crystals of glassy and gemmy, colorless calcite are aesthetically perched high on a thin drapery of teal blue aurichalcite. All of this is on a sliver of limonite matrix. They are to 1.5 cm across and very sharp, and gemmy clear. The contrast is striking and unusual.
4.7 x 4.1 x 2.3 cm. Rhombs of intergrown, glassy and translucent calcite, to .8 cm across, totally cover a limonite matrix. The rhombs are infused with fibrous aurichalcite, resulting in a lovely teal color. Very glassy lustre. Tim Blackwood Collection.
Fine analcime crystals to 1.3 cm, with lustrous, sharp faces, in a bed of small calcite crystals. English analcimes are NOT common on the market! 6.1 x 3.6 x 2.4 cm
27.2 x 16.5 x 13.0 cm. The two largest crystals of calcite in this cluster are doubly-terminated with multi-forked tips. The intense cognac color and gemminess is more pronounced at the terminations. The large crystal is a whopping 22.0 cm across and pristine. A superb specimen not often found, even in the heyday of the mine.
17.1 x 12.5 x 11.1 cm. This cluster of doubly terminated, gemmy, intense, cognac colored calcite is highlighted by multi-forked tips. Perched on a sliver of matrix, this specimen resembles modern architecture. The longest crystal measures over 12 cm in length. For its size this specimen is remarkably free of damage.
15.5 x 11.0 x 6.8 cm. A dramatic, sculptural, floater cluster that is terminated all around with glassy, yellow-colored crystals. A gemmy calcite crystal, 12 cm in length, that is doubly-terminated and twinned, is perched on a cluster of other calcite crystals at the core. The large crystal has cognac colored terminations and a light yellow-golden color in the center that is not typical of Elmwood to my eye. All tips are very gemmy, and the overall effect of this piece is like that of a sculpture, 3-dimensional and engaging to the eyes.
12.3 x 7.1 x 5.7 cm. This gemmy, extremely lustrous, twinned calcite crystal has intense cognac coloring and multi-forked terminations. It is very sharp and has much more intense lustre and color in person. It is also very robust and 3-dimensional.
21.5 x 15.6 x 9.0 cm. This is a cluster of gemmy, cognac colored calcite crystals, to 14 cm across, on a matrix of gray limestone. The vertical crystal is twinned and doubly-terminated although there is very minor bruising at the upper termination culminating in a backwards-leaning cleave at the tip. There is a slight cleave on the leftmost termination of the left crystal, as well.
16.5 x 9.9 x 5.0 cm. This very aesthetic cluster of gemmy, cognac-colored calcite crystals are perched on a sliver of limestone matrix. The twinned and doubly-terminated crystal on the left measures 12 cm across while the crystal on the right exhibits 5 multi-forked crystal tips. Unusual shape and superb crystal architecture, combined with a very high glassy lustre and the sharp twinning, make this a fine cabinet piece.
18.0 x 9.5 x 8.0 cm. Intensely colored, multi-forked crystal tips of gemmy, cognac colored calcite highlight this twinned and doubly-terminated crystal which is pristine save for a bruise at the very tip of the bottom end. It sits up nicely and is 3-dimensionally more robust and brighter than the photo conveys, so that the deep amber highlights atop show better in person.
16.2 x 13.4 x 7.4 cm. Two, large, gemmy, cognac colored calcite crystals, to 16 cm in length, oppose each other in a "V" formation. The crystals are doubly terminated. Only very minor bruising is evident at the tips.
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Rob Lavinsky, rob@irocks.com
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share specimen![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268044a.jpg]](db_pics/mdpics/MD-268044a.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268044b.jpg]](db_pics/mdpics/MD-268044b.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268046a.jpg]](db_pics/mdpics/MD-268046a.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268046b.jpg]](db_pics/mdpics/MD-268046b.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268048a.jpg]](db_pics/mdpics/MD-268048a.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268049a.jpg]](db_pics/mdpics/MD-268049a.jpg)
![Calcite, Aurichalcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268050a.jpg]](db_pics/mdpics/MD-268050a.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268051a.jpg]](db_pics/mdpics/MD-268051a.jpg)
![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268051b.jpg]](db_pics/mdpics/MD-268051b.jpg)
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![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269867a.jpg]](db_pics/mdpics/MD-269867a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269868a.jpg]](db_pics/mdpics/MD-269868a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269870a.jpg]](db_pics/mdpics/MD-269870a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269872a.jpg]](db_pics/mdpics/MD-269872a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269874a.jpg]](db_pics/mdpics/MD-269874a.jpg)
![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-269875a.jpg]](db_pics/mdpics/MD-269875a.jpg)
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![Calcite from Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA [db_pics/mdpics/MD-270079a.jpg]](db_pics/mdpics/MD-270079a.jpg)