Mineral Specimens with Calcite

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AURC-32 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
miniature, 5.0 x 4.2 x 3.7 cm

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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. Super, complex intergrown geometry and large crystal size make this a VERY impressive piece, with shocking intense color that looks fake. There is some minor damage to smaller crystals, hence the lower price compared to other pieces. This is one of the richest overall paltes 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! Because they are also lustrous, this is hard to photograph and I assure you the color and lustre both are better in person because we had the camera compromise to try to get each in some degree.

AURC-33 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 6.5 x 4.5 x 2.9 cm

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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. One of the best plates in terms of calcite quality and lustre!

AURC-34 - Calcite on Aurichalcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 6.0 x 5.2 x 3.7 cm

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Emplaced on a limonite matrix are spherules of pastel blue aurichalcite, to .7 cm across. Aesthetically perched on the aurichalcite, are bladed, fan -like, crystals of glassy and gemmy, colorless, calcite , to nearly 3 cm across. Absolutely striking! This was an unusual habit in the pocket, and I had only a few good pieces.

AURC-35 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 7.0 x 4.2 x 4.2 cm

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A VERY RICH, intensely colored cluster of equant, lustrous and translucent calcite rhombs, to 1.8 cm, is emplaced on ocherous limonite. The crystals, are, in turn, colored a rich blue by fibrous inclusions of aurichalcite. This is one of the richest overall paltes 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! Because they are also lustrous, this is hard to photograph and I assure you the color and lustre both are better in person because we had the camera compromise to try to get each in some degree.

AURC-36 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 7.3 x 5.4 x 4.0 cm

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This matrix specimen contains the largest rhombs of equant, lustrous and translucent calcite, in this lot. They reach 3.2 cm on edge and 4 cm across! The large crystal actually exhibits stepped growth. Differential inclusions of fibrous, aurichalcite have given the crystals a two-tone, blue coloration. Simply outstanding geometry and the shocking fake-blue color inside otherwise colorless calcite make this a good specimen, borderline great except for jhust a small bit of peripheral edge wear. Few calcite rhombohedra of such size were recovered, and this stands out very nicely in the lot as an excellent example of CALCITE from this find, more than most pieces which are simply for color or the lure of the association

AURC-37 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 6.4 x 5.2 x 2.7 cm

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A plate of intergrown, lustrous and translucent, calcite rhombs, to 2.0 cm across, is emplaced on an ocherous matrix. The crystals are heavily included by fibrous aurichalcite which has turned them a rich blue color. Only minor peripheral contact can be seen at the edges, which does not affect the overall quality of the specimen. This is one of the richest overall paltes 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! Because they are also lustrous, this is hard to photograph and I assure you the color and lustre both are better in person because we had the camera compromise to try to get each in some degree.

AURC-38 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 8.8 x 4.3 x 4.0 cm

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Perched high on limonite matrix is a plate of intergrown, lustrous and translucent, calcite rhombs, to 1.4 cm across. Differential inclusions of fibrous aurichalcite heve given the crystals a variegated, blue coloration. It has some very minor damage and wear on the edges, mostly to lower crystals, but is quite pretty and appealing overall.

AURC-39 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 8.5 x 4.6 x 3.9 cm

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On a sliver of limonite matrix, is a plate of intergrown, lustrous and translucent, calcite rhombs, to 1.5 cm across. These are heavily invested with fibrous aurichalcite, resulting in a rich blue color. There is even a coating over the calcite rhombs of pastel blue, fibrous aurichalcite.. A fine display quality specimen with unusually good lustre and a very even coloration to it, this is a good deal for the price, I felt as I tried to amortise to keep a nice larger piece under $1000

AURC-40 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 8.7 x 5.6 x 3.2 cm

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Like an aqua-blue ocean lapping up on an ocherous island beach, lustrous and translucent, rhombs of calcite, to 1.7 cm across have been colored a rich blue color by fibrous inclusions of aurichalcite. This is definitely evocative of a tropic isle and water (says my helpers here!). It is surely one of the most impressive pieces overall for color intenstiy, crystal definition, and overall aesthetics in this size range. 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! Because they are also lustrous, this is hard to photograph and I assure you the color and lustre both are better in person because we had the camera compromise to try to get each in some degree.

AURC-41 - Aurichalcite in Calcite - SOLD
Ojuela Mine, Mapimi, Durango, Mexico
small cabinet, 5.7 x 5.1 x 4.0 cm

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Equant, lustrous and translucent rhombs of calcite, to 1.7 cm across have been differentially included by fibrous aurichalcite, resulting in a two-tone blue appearance. These crystals are perched on fibrous, pastel blue aurichalcite, which, in turn, is emplaced on ocherous limonite matrix. Excellent example of CALCITE from this find, more than most pieces which are simply for color or the lure of the association

AZMEX16 - Calcite with Malachite - SOLD
Bisbee, Cochise County, Arizona, USA
miniature, 5.0 x 4.6 x 3.7 cm

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Calcite with Malachite from Bisbee, Cochise County, Arizona, USA [db_pics/pics/azmex16a.jpg]

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Calcite with Malachite from Bisbee, Cochise County, Arizona, USA [db_pics/pics/azmex16b.jpg]

Nature sometimes provides us with exquisite glimpses into the phases of growth of mineral pockets! In this case, colorless, transparent, lustrous, rhombs of calcite, to .8 cm across, have formed around a single sphere or botryoid of rich, green malachite, measuring 2.0 cm across. In fact the calcite rhombs nearest the malachite are partially invested with lighter green malachite inclusions. Truly a little gem!

AZMEX31 - Acanthite ps. after Argentite on Calcite - SOLD
Valencia Mine, Guanajuato, Guanajuato Prov., Mexico
small cabinet, 6.2 x 5.4 x 5.3 cm

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Neatly perched on a matrix of white, botryoidal calcite is a cluster of dark gray, matte luster, crystals of acanthite after argentite. The largest cube measures .45 cm across. The label on the back side of this specimen indicates that it was mined in 1892. It later entered the collection of the University of Chicago, in 1964. It is a super locality piece because acanthites on such matrix are rare, but the dated label is surely a bonus and gives solid locality designation as well!

AZMEX52 - Aurichalcite in Calcite - SOLD
79 Mine, Gila County, Arizona, USA
small cabinet, 7.3 x 4.9 x 3.6 cm

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Aurichalcite in Calcite from 79 Mine, Gila County, Arizona, USA [db_pics/pics/azmex52a.jpg]

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Aurichalcite in Calcite from 79 Mine, Gila County, Arizona, USA [db_pics/pics/azmex52b.jpg]

Sky blue tufts of acicular aurichalcite on limonite are in turn covered by a .2 cm thick, glassy coating of calcite. This has turned the underlying aurichalcite color to a rich sea foam. This is an extremely aesthetic specimen. INCREDIBLY BEAUTIFUL IN PERSON, like a wave of artificial neon blue color!

bab10 - Babingtonite on Calcite - $ 1500
Hongquizhen Quarry, Meigu Co., Liangshan, Sichuan Province, China
small cabinet, 9.4 x 7.2 x 4.5 cm

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Lustrous and translucent, colorless crystals of calcite to 3 cm across form an agglomerated and very bizarre matrix for a single rather large crystal of jet-black babingtonite, 3.7 cm in length! This crystal is starkly frozen there in place, in its translucent "ice" of calcite so that you really have to look closely to believe this is real. It is tabular, doubly terminated, lustrous and just plain SHARP in a crystallographic sense - blocky in its geometry, perhaps, more than elegant as with some others here. Yet it is elegantly perched in the matrix.For that matter it displays well from either side: a SECOND crystal under the first one, 4 cm across, is a bonus. but ipersonally like the display face better from the front, showing the more isolated crystal above the calcites. I HAVE NOT SEEN ANOTHER of such quality, for this association with calcite, from here. These remarkable specimens, where even the mid-range material is better than the best of species EVER seen from anywhere else, come out of a very small, previously insignificant quarry that, according to MINDAT, is simply worked by the local farmers. This is a large and showy specimen at, I think, a fair price for the size and quality.

BASTTR-2 - Bastnaesite-Ce on Calcite - $ 2000
Trimouns Talc Mine, Luzenac, Ariege, Midi-Pyrenees, France
thumbnail, 1.8 x 1.4 x 1.1 cm

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A complete, perfect, transparent crystal measuring 1.75 cm across, perched beautifully on small calcite crystals. This is a competitive-level, impressive thumbnail specimen. A note about coloration: In fluorescent lights, these crystals look more amber-brown than in halogen lights, where they take on a more orange-red hue. When backlit moderately, as shown, they take on a nice red glowing color. All photos here are taken under sunlight balanced halogen, with moderate backlighting. Joe Budd photos.These were found at the classic old French locality for rare earth species, in the late 1970s, and have until now been hidden away by the collector. For sheer quality and beauty, many collectors have long considered the gemmy rare earth crystals from here to be among the best of their species. The productive specimen zone at the locality is, I am told reliably, simply mined out and gone now.

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Rob Lavinsky, rob@irocks.com

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