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Mineral Specimens with Calcite
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7.0 x 3.7 x 2.7 cm. These gemmy, water-clear fluorite cubes with brown centers are highly reminiscent of the famous fluorite specimens from Clay Center, Ohio, but are in fact, from one of several quarries at Newport, Monroe County, Michigan. The glassy cubes, to 6 mm, are richly scattered on both sides of the matrix and nicely accented by colorless to light amber, calcite scalenohedrons. An excellent two-sided, combination piece. Fluorite of this variety is not very common from this locality. Moderate purple fluorescence.
7.4 x 5.4 x 4.6 cm. Michigan Copper Country copper in calcite specimens are amongst the most desirable minerals species, along with superbly crystallized copper specimens, from this district. Here we have a large, very glassy, transparent to translucent, complete-all-around, double terminated calcite crystal heavily infused with native copper with a nice patina. This historic classic, probably dating prior to World War I, is in outstanding condition, with only very minor edge-wear. Specimens of this size and quality are only available from recycled collections. Ex. Mullane Collection accompanied by an old Burminco label with a May, 1952 date.
6.9 x 6.2 x 3.8 cm. A classic and showy cluster of translucent, lightly frosted, pastel-pink, manganoan calcite scalenohedrons from the Idarado Mine of Colorado. The large and small crystals have slight termination cleaves and the middle crystal is cleaved, but this remains a highly representative example of the species and famous locale. Super orange-pink fluorescence. Ex. Mullane Collection and certainly dating to the active mining period here.
6.6 x 6.3 x 3.6 cm. An aesthetic and beautiful, old-time calcite specimen from the historic Joplin Field and the George Feist Collection. Three intergrown, composite, stacked clusters of lustrous, translucent, striking golden-amber, nail-head calcite crystals are artfully set on silicified limestone matrix. The clusters look and shine like poured honey.
10.5 x 2.4 x 1.7 cm. A bizarre and fascinating looking cabinet cave calcite specimen from recent finds in China. This sharp, silky lustre, translucent crystal is actually twinned along the long axis and has a hollow tube running up from the base of the crystal. Moderate white fluorescence.
4.2 x 3.4 x 3.3 cm. A very attractive specimen of calcite twins formed by the contact of two rhombohedrons. The amber, Christmas tree-like crystals are water-clear and have an intense, gemmy lustre. Two small lots of crystals were recovered in 2001 and 2004 from a now extinct basalt quarry in Madagascar. Complete-all-around. These are a unique style of twinned calcite crystals. Ex. Tarnowski Collection.
5.3 x 4.2 x 3.1 cm. An aesthetic and sculptural combination specimen from the Mina Ojuela. Botryoidal duftite coats olive-green wulfenite blades, which in turn, are preferentially coated with lustrous calcite rhombs. A showy and excellent specimen, seldom available in this quality and combination from the John Ydren Collection.
7.5 x 6.3 x 4.4 cm. A highly unusual and very fine pair of intergrown, spherical calcite crystals nicely accented with gemmy, ruby-jack sphalerite crystals. The frosted, translucent calcites have a rich, golden-honey color when backlit. This is old-time, pristine material from this historic district and is from the very much less well-known Leopard Mine of the Picher Field. A striking and strange calcite specimen from the George Feist Collection # 1440. It looks like a fossilized dinosaur egg.
12.5 x 10.0 x 8.5 cm. A striking cabinet combination specimen from the Southwest Mine at Bisbee from the collection of noted Arizona collector, Evan Jones. Glassy, colorless calcite scalenohedrons to nearly 1 inch, some doubly terminated, are selectively and pleasingly included with and coated with malachite. The showy multitude of calcite crystals rests on a matrix of solid, wine-red, massive cuprite. Hefty for its size, with the massive cuprite, at 4.6 pounds or just over 2 kilograms. Outstanding, older material from this renowned locale.
6.5 x 5.7 x 4.2 cm. A fine and classic Brushy Creek Mine specimen of iridescent marcasite richly and preferentially coating lustrous, gray calcite scalenohedrons. This is an excellent, complete-all-around and undamaged piece. The sparkly colors of the iridescent marcasite are dazzling. Ex. Feist Collection.
11.5 x 9.0 x 5.0 cm. China has recently provided us with an amazing variety of calcite specimens of all habits, colors and sizes. This striking cabinet specimen features a multitude of glassy, translucent, light amber, nail-head calcite crystals with incredible oriented overgrowths of pyrite microcrystals. Nearly every calcite crystal has pyrite on it. The riveting primary crystal is 4.2 cm across.
15.4 x 13.4 x 9.0 cm. A superb, old-time, large cabinet specimen featuring calcite scalenohedra on gossan matrix from Frizington, England. It is like a pin-cushion or hedgehog. The lustrous, translucent dogteeth reach around 5.0 cm on this important historic piece. Ex. Cal Tech Collection.
6.7 x 5.0 x 4.8 cm. Sparkly, grass-green conichalcite microcrystals beautifully accented with glassy, colorless calcite crystals cover both sides of the crest of the very lightweight, bubbly, botryoidal limonite matrix on this very striking and colorful specimen from the Mina Ojuela. This fine piece probably dates to the 1970s finds at this historic locale. Ex. Consie Prince Collection.
7.2 x 4.6 x 2.5 cm. A rare and superb cluster of sharp, highly to moderately lustrous, lead-gray, parallel-growth, spinel-twinned galena crystals from the Buick Mine of Missouri’s Viburnum Trend. These large crystals and style are classic for a particular find there, in the 1990s. This excellent, complete-all-around crystal is richly and beautifully covered on the back and one edge with lustrous dolomite rhombs, sparkly, brassy marcasite crystals and a couple of well-placed, calcite scalenohedrons. The doubly terminated calcite on the end is 1.5 cm (one end is cleaved).
8.7 x 6.5 x 2.0 cm. Highly lustrous, caramel-colored, tabular wulfenite crystals to 1.0 cm are aesthetically scattered on the limestone matrix plate covered with sparkly, drusy calcite on this fine specimen from the Erupcion Mine at Los Lamentos. This remains a highly representative example of the species and locale. Ex. Consie Prince Collection.
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Rob Lavinsky, rob@irocks.com
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