Mineral Specimens with Calcite

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PB56 - Calcite (Manganoan) - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 10.1 X 9.5 X 5.6 cm

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ex. Peter Bancroft

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This pristine cluster of frosted, creamy pink colored, lustrous, translucent, manganoan calcite rhombs, is just spectacular. Dating from the 1960�s finds here by its style, this specimen has a dusting of tiny chalcopyrite crystals as well as pyrite. The largest rhomb is 5.0 cm on a side. Oh by the way, this specimen fluoresces a vivid orange on long wave ultraviolet light. I know this is "just calcite," but I believe it deserves high status for the quality not only just for the locality, but for a sharp rhombohedral calcite, period!

PB58 - Silver with Calcite - SOLD
Kongsberg, Norway
small cabinet, 6.9 X 4.5 X 1.6 cm

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ex. Peter Bancroft

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Silver with Calcite from Kongsberg, Norway [db_pics/pics/pb58a.jpg]

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Silver with Calcite from Kongsberg, Norway [db_pics/pics/pb58b.jpg]

An exceptionally elegant specimen of this classic combo! Silver from Kongsberg is already rare enough in good form, but the most treasured pieces are associated with good calcite, for contrast and style! This is a superb matrix piece with unusual elegance and form. It has thick ropy silver wires to 1 cm thick, and can be displayed any number of ways, pretty much from all sides upsidedown or rightside up , with equal ability.

PB6 - Calcite with iridescent Pyrite - SOLD
Santa Eulalia, Chihuahua, Mexico
cabinet, 10.7 x 7.5 x 3.9 cm

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ex. Peter Bancroft

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Calcite with iridescent Pyrite from Santa Eulalia, Chihuahua, Mexico [db_pics/pics/pb6a.jpg]

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Calcite with iridescent Pyrite from Santa Eulalia, Chihuahua, Mexico [db_pics/pics/pb6b.jpg]

Iridescent, striated, modified cubes of pyrite, to .8 cm across, are nestled down among flower-like, clusters of snow white, translucent, calcite. The calcite clusters average 1 cm across. BEAUTIFUL and stark combination! This is old material, in a style not found in modern mining here.

PKN6 - Calcite on Quartz - $ 275
Jalgaon, Maharashtra, India
small cabinet, 6 x 3.5 x 3.2 cm

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Calcite on Quartz from Jalgaon, Maharashtra, India [db_pics/pics/pkn6a.jpg]

Golden calcite from India has been on the market for several years ,at least. For the money, this lovely lustrous golden calcite, perched on crystallized quartz is as good as is they get. The calcite crystal is 1 inch tall. In person, those weird black streaks you see aren't so distracting. they are small flecks inlain along natural patterns in teh crystal.

PKN70 - Quartz pseudomorph after Calcite (twinned) - $ 750
Jalgaon, Maharashtra, India
small cabinet, xxx cm

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Quartz pseudomorph after Calcite (twinned) from Jalgaon, Maharashtra, India [db_pics/pics/pkn70a.jpg]

PR10 - Beryl var. Emerald on Calcite - SOLD
Coscuez Mine, near Muzo, Boyaca Dept., Colombia
small cabinet, 7.1 x 4.6 x 4.2 cm

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This is a very dramatic piece with a central emerald flanked by "wings" of crystallized calcite. The 2.8-cm-tall emerald is of top color and glassy lustre, and is very large for such a specimen. It is entirely transparent throughout, though with internal veils as usual in a specimen. You can see righ tthrough it to the underlaying matrix! The emerald is complete, and undamaged per se, though it has a small natural contact in the upper-left that is visible (only) on close inspection and does not visually detract. However, because of this very slight growth imperfection, and the fact that I got this reasonably in a trade, the price is about half or a third what you would normally expect to pay for a 1-inch-plus emerald in crystallized matrix of such quality. The calcite is as remarkable , also of unusual size for crystals from this mine. The combined contrast of colors and geometry is striking. Most desirable emerald specimens MUST be on the crystallized matrix, and of the various styles most people consider dark calcite to be the more desirable because it serves to enhance the hue of the emerald. This piece, interestingly, has both dark and white calcite , providing a very neat double-color contrast to the emerald itself.

PREMU-J4D14 - Calcite Twin - SOLD
Elmwood, Smith County, Tennessee, USA
cabinet, 11.5 x 5.5 x 5 cm

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Sorry, we have no images of this specimen at present.
To go with the fine Elmwood fluorite in this update, here is the other mineral these mines are famous for. This is a "jewel" calcite, extraordinarily gemmy and glassy-lustrous (better in person!), with just a tiny attachment of sphalerite on the bottom. Frankly, this is an $1,800 specimen but for a clean cleave at one of the terminations that points backwards and is NOT at all visible from the front anyways (and, the vast majority of these have cleaves, so they are easily forgiven). So if you can live with this very small cleave on the back of the left termination, here is a lot of eye-candy for the price!

PREMU-J4D19 - Manganoan Calcite - SOLD
2nd Sovietskiy Mine, Dalnegorsk, Russia
small cabinet, 8 x 8 x 4.5 cm

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Sorry, we have no images of this specimen at present.
This realy showy pink calcite specimen is close to cabinet-sized. It features two pristine, very large crystals that have intergrown side-by-side, with gently curving pseudo-pyramidal terminations, lustrous faces and wonderful pastel-pink color. The crystals were cleanly sheared off from the matrix calcite to remove it from the pocket, with a small stack of white poker-chip calcite providing a really nice accent. Contact is limited to the back and very lower left. This beautiful piece was mined this year in Dalnegorsk.

PREMU06-14 - APATITE on Calcite - SOLD
Cerro de Mercado, Durango, Mexico
small cabinet, 7.0 x 6.1 x 3.9 cm

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ex. Irv Brown

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This piece stands so far above most others of its kind, that it really has been for many years my single favorite piece for the locality that I have known about, in any collection. The piece features a stunning electric green-yellow crystal the color of a good brazilianite, measuring 2.25 inches tall and with GLASSY lustre. Matrix apatites from here are really rare, and generally older material from the 1960s-70s era of mining here. I have only seen a few of anything near this calibre , but still rank this one aesthetically the best of them. I know its tempting to dismiss this as simply an "overpriced apatite" but , honestly, its a very special case where the mineral transcends its commonness as a species and IS a world class specimen by any standard even aside from the value for the locality itself.

PREMU06-17 - COPPER-INCLUDED CALCITE on COPPER - SOLD
Quincy Mine, Hancock, Houghton County, Michigan, USA
cabinet, 11.0 x 7.3 x 6.3 cm

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ex. Irv Brown

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These old classics come up to market so rarely in this quality and calibre, you can count the ones on a hand that have been for sale this decade. This is a spectacular display quality AND a fine specimen for historic reasons , at the same time. The main crystal is 3.5 inches tall, 3-dimensional and fat, and lustrous as you could wish for. The matrix is a mix of copper and rock. Its a big piece, without seeming massive, elegant despite the unusual size of the crystals. It is just a piece that stands so far above the crowd, I would keep it in a second if i were still adding calcites to my personal calcite collection (I have collected calcite since i was a kid and i do NOT have a finer specimen, and none of this size and quality. But, I've decided to sell my calcites and will do so soon...although its agonizing).

PRNJ-04 - Prehnite cast after Anhydrite with Calcite - $ 9500
Prospect Park Quarry, Prospect Park, Passaic Co., New Jersey, USA
large cabinet, 16.5 x 11 x 11 cm

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Multiple, well formed fingers of very lustrous and translucent, light apple-green prehnite to 4 cm in length are themselves highlighted by a lustrous and translucent, doubly-terminated, colorless calcite crystal ( 4 cm in length). The bottom face clearly exhibits example of hollow casts that were once anhydrite. The front shows stalactite-looking prehnites (actually they are cast epimorphs , giving that illusion), splaying out in all directions for a very 3-dimensional impact. Once again there is no damage in evidence, and no repair! The piece looks good upside down too, from the top photo shown - you can see the closeup which shows off the intergrown prehnites in the lower photo panel. A stunning and dramatic specimen, this is perhaps our best cabinet piece and is worthy of any of the major museums preserving American treasures of this calibre. It is one of the finest large examples from this find.

PRNJ-06 - Prehnite cast after Anhydrite with Calcite - $ 900 SOLD
Prospect Park Quarry, Prospect Park, Passaic Co., New Jersey, USA
miniature, 5.5 x 4.8 x 4 cm

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A spectacular large-miniature combo specimen,with fingers of very lustrous and translucent, light apple-green prehnite to 3 cm in length enhanced by a doubly-terminated, lustrous and translucent, colorless calcite crystal measuring 3 cm in length. I particularly like the way the largest prehnite finger is rotated away from the viewer while the calcite is rotated toward the viewer, making for depth of field. The bottom face clearly exhibits hollow casts of what once were anhydrite. Simply among the most aesthetic pieces here!

PRNJ-18 - Prehnite cast after Anhydrite with Calcite - $ 900
Prospect Park Quarry, Prospect Park, Passaic Co., New Jersey, USA
small cabinet, 7 X 7 X 5.5 cm

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Beautifully centered atop other fingers of prehnite is a spire reaching 2.5 cm in length accented by a sidecar, gemmy calcite. The prehnite fingers are very lustrous, translucent, and exhibit a light apple-green color. A later generation of lustrous and translucent, colorless calcite crystals, to 1.75 cm, has draped the prehnite fingers in an aesthetic combination. The bottom side of the specimen clearly shows hollow casts of what once were anhydrite. This is a dramatic, showy piece, with excellent 3-dimensional mounded form

PRNJ-19 - Prehnite cast after Anhydrite with Calcite - $ 600
Prospect Park Quarry, Prospect Park, Passaic Co., New Jersey, USA
cabinet, 12.3 X 9.5 X 9.5 cm

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Totally different from most of the other specimens in this update, this piece is a crust of lustrous and translucent, light apple-green prehnite, upon which are emplaced sharp, lustrous and translucent modified scalenohedrons of colorless calcite (to 3 cm). Unusual and attractive combo plate!

PRNJ-22 - Prehnite cast after Anhydrite with Calcite - $ 1800
Prospect Park Quarry, Prospect Park, Passaic Co., New Jersey, USA
cabinet, 12 x 10 x 4 cm

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This is a cluster of lustrous and translucent, light apple-green prehnite fingers to 3.2 cm in length. At the top of the specimen are lustrous and translucent, colorless calcite crystals - the largest being 4.5 cm in length, with a few sidecars next to it. This large calcite is also doubly-terminated. Very nice association piece, with great balance! The prehnite stalactite atop perfectly balances the calcite next to it, for display, on tis well-trimmed specimen

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Rob Lavinsky, rob@irocks.com

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