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Mineral Specimens with Calcite
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13.0 x 11.2 x 5.6 cm. This is another old 19th Century mineral specimen from the famous late-1800s Jefferis collection. In this case smithsonite has pseudomorphed calcite crystals which reach 3.75 cm across. In addition, a surface coating of greenockite, cadmium sulfide, has covered the crystals. This is a famous old occurrence and specimens are rare today, particularly cabinet sized pieces such as this one which have preserved whole clusters. The Jefferis label accompanying is dated 1878. Ex. Carnegie Museum Collection.
13.5 x 6.9 x 5.4 cm. Water clear rhombs of lustrous calcite, some tinged reddish-brown by hematite, reach 2.0 cm across. From the James E. Moresby White collection. This is a spectacularly showy, large plate of high quality and minimal damage only, notable for the extremely high lustre and "sparkliness", as well as the size. Ex. Carnegie Museum Collection.
8.0 x 6.9 x 6.3 cm. This is a cluster of large, doubly terminated, glassy and gemmy sulfur crystals, to over 4.0 cm in length. The back side of the crystals has an overgrowth of sugary, tan colored calcite or perhaps melanophlogite. From the collection of James Moresby White. An old Krantz label accompanies this piece, dating it to the late 1800s. It is a very unusual specimen in overall aspect. Ex. Carnegie Museum Collection.
6.7 x 4.3 x 2.4 cm. This limonite matrix has two crystals, one complete, of smithsonite after calcite. The complete crystal measures 2.25 cm across and it as well as the open hollow crystal are colored yellowish-tan by the cadmium sulfide mineral greenockite. Classic old material hard to obtain today. Ex. Carnegie Museum Collection.
4.4 x 1.3 x 1.1 cm. Looking very much like a calcite from Dal'negorsk, this colorless, glassy and gemmy calcite crystal is instead from Cuba. A rare occurrence! I have seen very, very few. Small cleave on the back of the termination, but still displays well from the front and is important for the locale. Ex. Carnegie Museum Collection.
9.5 x 7.4 x 5.3 cm. Glassy, colorless, lightly frosted calcite scalenohedrons showingly cover marble matrix on this exceptional California specimen from the John Sinkankas Collection. The dogteeth calcite crystals reach 2.5 cm and this fine piece is essentially pristine. I obtained this from John in 1998 or so and kept it in my calcite collection since, never having seen another example from here to compare it to. The specimen was collected by his son in 1972 from the Kaiser Steel Mine, Eagle Mountain in Riverside County. This is an UNCOMMON California locality.
3.2 x 2.5 x 2.2 cm. Emerald-green, gemmy dioptase crystals to 1.1 cm are aesthetically set on calcite matrix on this showy and excellent specimen from an UNCOMMON dioptase locality - the Malpaso Quarry, Cordoba, Argentina. Ex. Dave and Emily Stoudt Collection. Dave worked and lived in Buenos Aires. Seldom on the market.
3.6 x 3.5 x 2.2 cm. A striking, twinned calcite crystal from a very recent and small find at the famous Daye Mine of China. This pristine, water-clear, hexagonal, poker chip calcite crystal is SO sharp it looks like a cut gemstone! The beautiful, two-sided calcite sits very nicely on a crust of smaller calcite crystals. The super-sharp faces and internal refractions reflect the tan crust within the poker chip crystal. A neat phenomenon. China is producing a stunning variety of fine calcite crystals, of which this is a very fine representation.
4.8 x 4.0 x 1.8 cm. An EXQUISITE and old-time wire silver specimen with calcite from the historic mines at Kongsberg, Norway. Combination pieces like this featuring elegant wires impaling calcite are the most desirable style, and specimens have been mined here since the 1600s. The longest and thickest silver wires very attractively project upward from the dense silver wire nest encased in calcite and are nicely burnished with a bright natural patina. And the calcites attached to the silver wires, near the top, are a beautiful and classic highlight. Ex. Korpi collection.
21.3 x 17.4 x 8.2 cm. A BIG plate of razor-sharp crystals of tan-colored calcite, with red internal phantoms, from Mexico. Crystals measure to 3 cm. This is from a new find at a reworked old locality which produced these classic calcites last 30 years ago.
13.7 x 9.4 x 8.4 cm. A large, dramatic specimen from a recent find in China, featuring these huge and rather amazing disc-like, hexagonal crystals, to 6 cm across - with lustrous side faces and milky terminations sandwiching translucent interiors. Just a bit of damage here and there and mostly on the periphery: most of the major crystals are in fine condition. These crystals are truly bizarre, in person!
5.8 x 5.6 x 3.9 cm. This 2.5-cm galena crystal from Eastern Europe is absolutely bizarre - actually a compound crystal that has formed as a thin sheet from hundreds of small stacked cubes! You can see sticking out of the top a little burst of calcite crystals that contain tiny inclusions of galena. This unique galena sits on a plate of platy white calcites.
4.3 x 2.7 x 2.1 cm. An exquisite Eastern European mini featuring a sharp, diamond-shaped quartz crystal that has been pseudomorphed by sandy quartz. At its base are more of these quartz crystals on a smaller scale, along with a translucent chisel-terminated calcite.
6.7 x 5.9 x 3.8 cm. This Illinois old-timer is a super-sharp corner of a fluorite crystal that has been completely covered with snowy white calcite. Then, on the calcite grew these micro-crystals of blue-gray celestite - a very unusual Illinois combo specimen! Ex. George Feist Collection.
5.9 x 4.4 x 4.3 cm. The Auglaize Quarry is better known for its glassy little purple fluorites, but it also turned out fine calcites - as represented here by a doubly-terminated, 5-cm crystal with gemmy golden tips, perched beautifully on the matrix so that it is nicely exposed all the way around.
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Rob Lavinsky, rob@irocks.com
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