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Mineral Specimens with Calcite
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Miniature. Ex. Richard Hauck Collection.
9.3 x 6.9 x 4.5 cm. This is a new find of lustrous, translucent to transparent calcite crystals: some with overgrowths, others with phantom zoning. These tabular, colorless, calcite crystals to 8 cm across, on a brecciated limestone matrix, are starkly dramatic! It is the short prismatic faces on the edges that are glassy and gemmy so that you can look down through them to the base of the crystal's attachment points, while a slightly frosted or whiter layer of calcite presents on the hexagonal faces.
14.0 x 10.3 x 6.0 cm. This matrix specimen of brecciated limestone is host to several large, tabular calcite crystals along with many small ones. the basal hexagonal faces are milky white while the short prismatic faces are glassy and gemmy so that you can look right down into them, presenting an ”Oreo” effect in ghostly white! The largest of these calcite crystals is 5.5 cm across and they are nearly pristine - seemingly unusual for this find, in a cluster so large.
14.7 x 9.8 x 7.6 cm. White on white but with drama you do not often see...This matrix specimen features a large, tabular calcite crystal with milky overgrowths on the basal faces and glassy and gemmy, colorless, short prismatic faces that you can look right down through to the attachment beneath, presenting an ”Oreo” effect in ghostly white! The largest crystal measures 8.5 cm across, quite a significant size for this find from what I saw at Tucson.
12.1 x 9.0 x 6.4 cm. A shard of dark gray limestone is the host for a very large calcite crystal which is framed, aesthetically, near the base by a cluster of smaller calcite crystals. The large crystal, 8.75 cm across, is thick, colorless, translucent and lustrous. It has a gemmy and colorless core which was overgrown by a later generation of calcite. Just like the other calcites in this update the short prismatic faces are the gemmiest and the contrast is very striking. Minor bruising on a few edges, and one contact at the lower-right-rear of the major crystal, is insignificant in context given this crystal appears to be the maximal size from the find, from what I saw in Tucson.
11.6 x 7.3 x 4.0 cm. This matrix specimen features two calcite crystals, one with short prismatic faces and the other with much longer prismatic faces. Both crystals are colorless with good translucence, and gemmy prism faces. They also exhibit overgrowths milky overgrowths on the basal faces and glassy and gemmy, colorless, short prismatic faces that you can look right down through to the attachment beneath, presenting an ”Oreo” effect in ghostly white! The larger, almost equant crystal measures 3.0 cm in length. This specimen offers a nice contrast in crystal growth and lots of angles to peer into the crystal cores.
8.3 x 7.8 x 7.3 cm. This superb, aesthetic cluster of calcite crystals on matrix features crystals like an “Oreo“ sandwich where the two basal faces are colored white at their very edges and the short prismatic faces between them are glassy and gemmy and colorless, so that you can look inside down to the matrix underneath! The larger crystal measures 5.0 cm across. This is overall a very elegant combination of crystals on sparing matrix.
8.3 x 6.8 x 5.4 cm. A sliver of matrix is the host for four, intergrown crystals of calcite, to 4.5 cm across, splaying out from the core. This aesthetic arrangement features lustrous, translucent, colorless crystals, all with the characteristic overgrowths near the terminal hexagonal faces, contrasting with gemmy and glassy, short prismatic faces that you look through into the crystal from the edges. Very sharp and geometric!
7.3 x 4.7 x 3.8 cm. This specimen features a nearly pristine, large calcite crystal, 7.3 cm across. The two basal faces have zones of ghostly white color in stark contrast to the short prismatic faces between them being glassy, gemmy and colorless. Unlike most of the others here, however, there are more gemmy clear areas to the side hexagonal faces, as you can see. Adding to the beauty and form of this specimen is a small cluster of white calcite crystals at the base of the larger one. Looking down the gemmy prism faces, one can see all the way through 4cm or so to the bottom of the crystal and the slight bit of attached matrix underneath!
13.1 x 9.0 x 5.6 cm. The large crystal, 7.25 cm across, is extremely thin compared to its length and more gracile than others above. It is mostly a ghostly white color on the two basal hexagonal terminations which frame glassy and gemmy, colorless, short prismatic faces between them like an Oreo sandwich. In addition, this magnificent large crystal is wreathed by many smaller white calcite crystals with no well-formed spacing between the flat sides (i.e. truncated prism faces), like sharp flat discs setting off the fatter crystal in their midst, all of which makes the specimen more elegant as a whole.
8.5 x 6.5 x 6.1 cm. This is another superb calcite specimen that features a large calcite crystal, 7 cm across, with two, white basal terminations that sandwich a prismatic termination that is glassy, gemmy, and colorless so that you can look deep into the crystal through it. Smaller, white calcite crystals, like flattened disc with no prism faces, wreathe the base of this specimen. Side and back views are shown. Aesthetic!
7.1 x 4.3 x 1.3 cm. This single crystal of calcite has a lot going for it, and is unique amongst the pieces I was able to acquire. The core of the crystal is gemmy and colorless. The color then turns milky white but, near the termination are several layers of zoned colorless areas. The two edge hex faces sandwich glassy, gemmy, colorless, short prismatic faces which are so gemmy you can look right into, down, and through this crystal from top to bottom. Very neat crystal!!
5.6 x 4.2 x 2.1 cm. With faint zoning, two hexagon-shaped basal terminations on either side frame the short prismatic, glassy, gemmy, colorless terminations between - they are so clear that you can look right down through them, into the crystal and to its bottom!
5.1 x 3.6 x 2.7 cm. This is a beautiful, colorful (unusually so!) crystal measuring 1.4 cm, ensconced in a protected vug of crystallized calcite within massive calcite. One so rarely sees parisite on crystallized matrix from any locality, and the contrast to these calcites really adds a lot, visually, to the desirability of the piece.
7.5 x 3.2 x 2.7 cm. A flat-out, beautiful Tsumeb combination specimen of tiny, two-toned, radial tufts of acicular malachite crystals richly scattered on a 3-dimensional matrix of lustrous, gemmy, colorless calcite rhombs. I really like the color combination and form of this Tsumeb cutie. The malachite is primary malachite. Excellent material from this now-closed mine. Ex. Rob Smith Collection.
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Rob Lavinsky, rob@irocks.com
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