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Mineral Specimens with Calcite
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8.3 x 5.4 x 4.3 cm. From what has to be the most famous single calcite find of the modern era in China, these sharp crystals came out around 2000. Amongst the razor-sharp spikes, sits a pristine, jewel-like, sharp twinned calcite measuring 2 cm from tip-to-tip across the width atop. Though more spiky-growth calcites have come out since, these twinned crystals remain one-of-a-kind and uniquely desirable. This specimen is sharp all around. The slight hematite staining gives a red tint to some crystals and contrasts the curving top of the piece with the calcites of the main body. This specimen is very 3-dimensional. Ex. Dr. Stephen Smale Collection.
8.7 x 6.0 x 3.0 cm. From what has to be the most famous single calcite find of the modern era in China, these sharp crystals came out around 2000. Amongst the razor-sharp spikes, sits a pristine, jewel-like, sharp twinned calcite measuring 1.8 cm from tip-to-tip across the width atop. Though more spiky-growth calcites have come out since, these twinned crystals remain one-of-a-kind and uniquely desirable. This specimen is sharp all around. Hematite staining gives a red tint to the crystals, which is a beautiful effect. Ex. Dr. Stephen Smale Collection.
13.5 x 9.4 x 4.5 cm. A classic and fine cabinet combination specimen from the Telluride District of Colorado. Dogtooth calcite crystals to 2.5 cm with an interesting, second-generation calcite overgrowth richly cover the sulfide matrix. A couple of pockets of iridescent, golden pyrite cubes are nearly hidden amongst the calcite crystals. A nodule of lustrous, black sphalerite crystals on the lower left finalizes this excellent Colorado combination piece, which is essentially pristine. Ex. Mullane Collection.
10.2 x 9.8 x 3.0 cm. Brilliant, gemmy, magenta roselite crystals, nicely complimented with sharp, glassy, pink, cobaltoan dogtooth calcite crystals, richly line the well-placed 3-dimensional vug on cobaltoan calcite-covered cabinet matrix on this fine larger specimen from recent finds at Bou Azzer, Morocco.
14.8 x 13.0 x 9.0 cm. A striking, gorgeous, large, 11.0 cm, lustrous, translucent, honey-brown, doubly terminated calcite crystal set amongst a bed of smaller calcite crystals and a bit of matrix. Interestingly, some of the crystal faces are preferentially, heavily striated, adding further accent to this excellent specimen from recent finds from the Fengjiashan Mine, Daye, China.
10.0 x 4.8 x 4.4 cm. A classic, very aesthetic cabinet calcite specimen from the George Feist Collection and the Sweetwater Mine of Missouri’s Viburnum Trend. A 9.0 cm, gemmy and lustrous, amber calcite specimen is set upright on the side of the mounded matrix. The isolated "wing" of matrix protruding from the side of the calcite is striking. The calcite faces are wonderfully stepped-faced.
15.3 x 9.9 x 6.5 cm. An old-time, classic, large cabinet calcite crystal cluster from the old lead-zinc mines at Shullsburg, Wisconsin. This superb, two-sided specimen consists of translucent, highly lustrous and striated, complex, light amber rhombs. It is complete all-around and has a thin spine of attachment on one side and at the base. The striking, large, centrally located rhomb is 7.1 cm. Ex. Mullane Collection.
12.1 x 4.8 x 4.3 cm. An excellent, classic, super-sharp, doubly terminated, gemmy and lustrous, amber calcite crystal from the small mine in Hoxie - I had one of these rare, glorious twins in my childhood collection and prized it highly. I have seen just a handful in 25 years of looking. This cabinet-sized crystal has very gemmy terminations. Complete all-around and very nearly pristine. Note the complex, beveled tips. These really stand out in person from Sweetwater or Tri-State material, to which they look superficially similar. Ex. Consie Prince Collection.
12.9 x 11.8 x 10.8 cm. A classic, old-time cabinet combination specimen from the Alston Moor District of England. This fine specimen features a 13.3 cm doubly-terminated, translucent, honey-colored calcite scalenohedron perched on the side of matrix. A lustrous, highly uncommon treasure lies underneath and on the side of the tiny calcite crystal rind: highly lustrous, black sphalerite crystals and a cluster of glassy, smoky quartz crystals. The smoky quartz crystals are rare for Alston Moor.
8.0 x 5.9 x 2.2 cm. Super-glassy, gem-like, colorless calcite crystals cover the matrix plate on this outstanding, pristine specimen from the Cypress Mine at Bagdad, Arizona. At least three calcite crystal forms are present on this specimen: most are simple scalenohedrons; the largest crystals are doubly terminated, twinned scalenohedrons at 3.6 and 1.8 cm; and there are even a couple of distinctive axe-head twins. Ex. Consie Prince Collection.
5.4 x 3.1 x 1.6 cm. Glassy, transparent, colorless calcite rhombs to 1.2 cm richly cover the 3-dimensional matrix covered with contrasting, green duftite from the Tsumeb Mine. A fine example of the species from the renowned locale. Essentially pristine. Ex. Rob Smith Collection.
14.0 x 11.9 x 5.2 cm. A classic, old-time, two-sided combination specimen from the famous Tri-State District. Iridescent, brass-yellow, triangular chalcopyrite crystals are richly sprinkled on the 3-dimensional carpet of elongated, moderate-lustre, pastel-pink dolomite blades on the matrix of gray chert. The chert on the backside of this excellent cabinet specimen is blanketed with tiny, pastel-yellow, complex, calcite rhombs. Ex. Mullane Collection. The front is in nearly pristine condition and the chalcopyrites reach 7 mm.
14.9 x 11.8 x 8.4 cm. A visually striking and highly unusual cabinet specimen from the very interestingly named Total Wreck Mine of Arizona. At first glance, the piece looks like sparkly, specular mottramite pseudomorphing an impressive cluster of large azurite or calcite crystals. Closer examination reveals, though, that the mottramite coats intensely brecciated limestone fragments. A nice additional bonus on the back are rich scattered patches of small, lustrous, calcite discs. The mine name may be due to the intense faulting found in the mine. This former Pb-Ag-Cu-Mo-Au-Mn-V mine was discovered in 1879 and was worked until 1940. Ex. Mullane Collection.
3.0 x 2.2 x 1.9 cm. A fine and unusual Tsumeb calcite miniature from the Jaime Bird Collection. A very showy radial spray of spiky calcite stalactites, formed by stacking of individual calcite rhombs, is richly sprinkled with accenting, green duftite. To top is off, a nifty floret of lustrous, brown calcite microcrystals is perched on the stalactites. Tsumeb produced an amazing array of fine calcite specimens and this is certainly one of them.
5.0 x 3.5 x 3.0 cm. Lustrous, un-twinned, ruby-red cinnabar crystals to 5 mm very richly and nicely set on contrasting, off-white calcite matrix from Charcas, Mexico. This is classic and very old material. Cinnabar is uncommon from Charcas and this is excellent material, surely very old. Very rich mercury specimen here, for Mexico - and pretty, as a cinnabar locality piece too. Ex. Jaime Bird Collection.
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Rob Lavinsky, rob@irocks.com
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