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Mineral Specimens with Aurichalcite
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3.5 x 3.2 x 1.2 cm. Rather equant rhombs of glassy and gemmy calcite, to 1.2 cm across, are aesthetically perched on limonite matrix. Just a hint of fibrous blue aurichalcite is seen in the rhombs.
3.5 x 3 x 1.25 cm. A small miniature with huge impact, featuring two sharp, tabular rhombs of calcite, to 3 cm across, that are heavily invested with a rich blue, fibrous aurichalcite. The crystals are lustrous and translucent except for one more transparent and colorless, gemmy corner. Large, elegant crystals for this find…and color.
5.0 x 4.2 x 3.7 cm. A cluster of intergrown, lustrous and translucent, equant calcite rhombs, to 2.0 cm across, are emplaced on a limonite matrix. Fibrous inclusions of aurichalcite have resulted in the crystals exhibiting a rich blue color. Excellent, complex intergrown geometry and large crystal size make this a very impressive piece, with shocking intense 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.
6.5 x 4.5 x 2.9 cm. Sharply formed, intergrown crystals of lustrous and translucent, rhombs of calcite, to 2.2 cm across, are richly colored blue by fibrous inclusions of aurichalcite. The color and stark contrast against the ocherous limonite is dramatic. A superb plate in terms of calcite quality and luster.
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.
6.8 x 3.9 x 2.8 cm. Pretty, excellent Kelly-blue smithsonite botryoids cover the silicified limestone matrix on this fine specimen from the Kelly Mine. The botryoids have excellent lustre and translucency and there is a layer of powder-blue aurichalcite beneath the smithsonite and on one end. Very interesting. Classic and desirable combination material from this noted locale.
WOW! Who would have thought I'd find this baby in Europe? But, there it was ! It is, to my own experience, a unique association and what a beautiful one, too! The windowpane wulfenite is small but perfect, and sharply contrasts with the rich blue aurichalcite. 5.7 x 4.3 x 2.3 cm
6.0 x 3.0 x 2.9 cm. The famous Mina Ojuela has produced a new find (2009) of this beautiful and striking combination material. Glassy, transparent calcite rhombs to 1.8 cm across richly and aesthetically line a sculptural vug in starkly contrasting, sturdy, gossan matrix. Portions of the calcite rhombs are included with vivid aurichalcite and some are not, which really adds to the attractiveness of this fine piece. A stunning new find.
6.4 x 5.3 x 3.1 cm. The Mina Ojuela has produced a new find of this beautiful and striking combination material. The large vug is filled with beautiful, scintillating soft-to-the-touch, felt-like, robin’s-egg blue aurichalcite needles and rests on a sculptural, sturdy, ship-shaped, gossan matrix. A few, small aurichalcite-included calcite rhombs are scattered about. A stunning new find.
10.3 x 7.8 x 4.2 cm. Vibrant, glassy, powder-blue aurichalcite richly and beautifully covers one side of the banded gossan matrix on this beautiful, older, cabinet combination specimen from the historic Mina Ojuela. The aurichalcite on the front is nicely accented with sparkling, glassy, disc-like calcite crystals. The old label accompanying the piece identified these as gypsum and hemimorphite crystals, they are so bright. Ex. Consie Prince Collection.
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Rob Lavinsky, rob@irocks.com
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share specimen![Calcite, Aurichalcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268040a.jpg]](db_pics/mdpics/MD-268040a.jpg)
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![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268044b.jpg]](db_pics/mdpics/MD-268044b.jpg)
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![Aurichalcite, Calcite from Ojuela Mine, Mapimí, Mun. de Mapimí, Durango, Mexico [db_pics/mdpics/MD-268048a.jpg]](db_pics/mdpics/MD-268048a.jpg)
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