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Mineral Specimens with Calcite
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A beautiful combo piece, among the few in the pocket with such exposed calcites not subjected to weathering and/or damage. The elongated casts of very lustrous, translucent, light green prehnite after anhydrite, to 4 cm in length, are mostly covered by calcite crystals: they are lustrous and translucent, and to to 3.5 cm in length. The calcites shoot up and off the plate, whereas the prehnites go left to right in orientation. The bottom face of the specimen clearly exhibits hollow casts of what were once anhydrite, showing how the prehnite formed as cast pseudomorphs atop. Super Interesting specimen, bluntyly: and one of the better calcites we obtained from the pocket !
A pretty plate of solid prehnite. Mostly nubby, short fingers of prehnite totally cover this plate. They are all very lustrous and translucent and of a light apple-green color. The largest finger reaches 3.5 cm in length, flat-laying. The bottom face shows evidence of hollow casts after anhydrite, upon which the prehnite formed. Tip-breaks, damage, to a few of the relatively minor prehnite tips in no way detracts from the specimen overall , but on close examination I do find them detracting and thus this is a much lower price on a big plate.
ex. Dr. Werner Paar Collection
Chalcostibite on tetrahedite, associated with (?) zinkenite, quartz and sharp disc-shaped calcite, featuring beautifully lustrous crystals of xls of Chalcostibite up to 5 mm; and arranged in clusters upon tetrahedite. The Romanian suite is of particular pride in this collection and he had several notable chalcostibite specimens, all from a famous and small find of about 1990. Never has the same quality come out before or since, here.
A large crystal of yellow fluorine-rich ellestadite to 1.5 cm, trapped in beautiful blue calcite. These are common enough as microcrystalline material from this locality, but few crystals of such size (and in good condition) are found. Quite exceptional for the species. Although still collected, I have seen many years' worth of material found here on sporadic trips by friends, and I can say crystals like this are superb and rare. NOTE: Texas Industries is the current owner of Riverside Cement and the cement plant there has been shut down since a week before Christmas 2008.
Freestanding, 3-dimensional sprays of fine boltwoodite xls to 8mm make this a superb species specimen, but also overall its quite unusually aesthetic. Rare in this quality, boltwoodite comes at its best from this uranium mine.
Spherocobaltite is a very rare (and thankfully beautiful!) cobalt carbonate, NOT to be confused with cobaltian calcite or dolomite which do not have as much cobalt in them. This is one of two beautiful specimens I obtained, from a find of the 1980s, with glittering, sugary, intensely colored maroon crystals of Spherocobaltite perched on matrix of rhomdohedral calcite. The druse underneath the crystals is probably acrystalline Spherocobaltite adhering to the matrix. The color is just...JUICY, for lack of a better word. I love these specimens and buy every one I see turn up, which is not very many these days.
Spherocobaltite is a very rare (and thankfully beautiful!) cobalt carbonate, NOT to be confused with cobaltian calcite or dolomite which do not have as much cobalt in them. This is one of two beautiful specimens I obtained, from a find of the 1980s, with glittering, sugary, intensely colored maroon crystals of Spherocobaltite perched on matrix of rhomdohedral calcite. The druse underneath the crystals is probably acrystalline Spherocobaltite adhering to the matrix. The color is just...JUICY, for lack of a better word. I love these specimens and buy every one I see turn up, which is not very many these days.
ex. Richard Hauck
Sharp, lustrous argentite crystals to 9mm nestled in a small pocket of quartz crystals on a massive quartz matrix. The largest argentite crystal appears to have been hollowed out or "hoppered" during formation yet is still well terminated. Unique, old European classics like this are very difficult to obtain.
ex. Richard Hauck
Very aesthetic group of chalcopyrite coated calcite crystals, with the largest crystal being more than 4cm across. The chalcopyrite appears to have preferentially coated only certain faces on the calcites. In addition, it appears that secondary calcite growth may have also covered some of the chalcopyrite. Slight contacting along some of the crystal edges can be observed but is forgiveable given the size and age and overall beauty, i think! A couple of old collection labels are included.
ex. Richard Hauck
This specimen features a matrix coated with a beautiful layer of pastel, aquamarine colored, acicular aurichalcite , blanketed with colorless, lustrous calcite crystals, to 1.0 cm across. Classic and rare today, on the market, these are selling at a premium when they do turn up and make for unique locality pieces.
ex. Richard Hauck
Small cluster of semi-transparent calcite crystals to 1.8cm, with bright shiny copper included within. The scalahedral calcite crystals are sharp and well-formed with no significant damage. Michigan calcites with copper came from several mines in the district, but almost all came out almost 100 years ago. Few clusters appaer on the market, with most specimens being singles. Also, this one is just plain pretty! This specimen comes with a label indicating the piece was purchased from a William Collins on June 3, 1935.
ex. Richard Hauck
This absolutely superb specimen features a large, rounded, flattened, rhomb of colorless calcite, 6.0 cm across, aesthetically perched on a matrix of pastel, lilac amethyst, to .5 cm across. This specimen is definitely a candidate for competition. The color contrast is awesome! VERY RARE OLD STYLE!
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Rob Lavinsky, rob@irocks.com
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