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Mineral Specimens with Tarbuttite
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Tarbuttite has come recently from Namibia in fine new specimens. But, as nice as they are, and as good as it is that more people can own a good example of this rare species, the finest historic examples of the species came from Broken Hill in old Zambia. From a private European collection, this is the best I have ever seen of that older material, even amidst the museums known for stocking such rarities (ex. Sorbonne, Houston. The color is a rich pastel green-yellow hue: not pale, very attractive. The crystals are gemmy, translucent to transparent at tips, and ROBUST in thickness and depth whereas normally the species appears as smaller crystals in all dimensions (or in the new finds as elongated lathe-like crystals). In size, it is large for the material and quite hefty at 524 grams (for a lightweight phosphate!). The lustre is GLASSY - better in person but somehow hard for the camera to pick up easily. In person, it is more sparkly and bright. This is old material, I am told, perhaps 1940s-1960s vintage. Possibly even earlier. There is no damage !!! it was coated with a white layer of some other phosphate which we found could be chemically removed, and that protected all these crystals from scratches. Overall, a superb, museum size and museum quality specimen that is a beauty in its own right, and important in context for this species as well. Joe Budd photos
4.4 x 3.7 x 2.3 cm. Tarbuttite perched nicely on its limonite matrix, this specimen features several, iridescent, translucent, sheaf-like crystals with stained golden-amber colored crystals reaching 1.25 cm in length. Ex. Martin Zinn Collection.
5.0 x 3.1 x 3.0 cm. Probably one of the prettier tarbuttite specimens out there, this specimen consists of two spherical rosettes reaching 2.9 cm across. The rosettes are pastel green with excellent luster and translucence, and the quality is unusual for the species and locality (TYPE LOCALITY).
5.2 x 4.7 x 3.8. cm. A rich spray of bladed, pearlescent crystals, to 1.1 cm in length, has emanated from a dark sulfide matrix. The combination of the translucency of the crystals and the color contrast is awesome, making this one of the more visually fine tarbuttites I have seen.
3.3 x 2.1 x 1.3 cm. An elegantly formed specimen of large, soft pastel green tarbuttite "sheaves" lightly decorated with minute white crystals of Skorpionite.
4.1 x 2.8 x 1.6 cm. An elegantly formed specimen of large tarbuttite "sheaves" of a soft pastel green.
5.0 x 3.1 x 2.7 cm. An elegantly formed specimen of large tarbuttite "sheaves" lightly decorated with minute white crystals of the new phosphate species Skorpionite, described formally in 2008 from this, the type locality. The skorpionite occurs in crevasses in the tarbuttite cluster as microcrystalline material. In person, the color of the tarbuttite is a soft pastel green.
3.5 x 3.3 x 2.2 cm. An elegantly formed specimen of large tarbuttite "sheaves" lightly decorated with minute white crystals of the new phosphate species Skorpionite, described formally in 2008 from this, the type locality. The skorpionite occurs in crevasses in the tarbuttite cluster as microcrystalline material. In person, the color of the tarbuttite is a soft pastel green.
14.5 x 14.0 x 2.7 cm. A fine and very rich cabinet specimen of the very rare zinc phosphate tarbuttite from the Kabwe (Broken Hill) Mine of Zambia, the Type Locality. Very gemmy, colorless to light gray tarbuttite crystals richly cover the sculptural gossan matrix plate on this fine old-time piece from the 1960s or earlier. Ex. Dr. Herman Bodson and Mullane Collections.
2.6 x 2.2 x 1.7 cm. A fine thumbnail specimen of the rare zinc phosphate Tarbuttite which is loaded with sharp, transparent to translucent, colorless triclinic tabular crystals on gossan matrix. The largest crystal measures 8 mm, which is good size for Tarbuttite. The Broken Hill mine (also called the Kabwe mine), in Zambia, not Australia, is the type locality for Tarbuttite, and has certainly produced some of the finest specimens of the species extant. Ex. Richard Kosnar Collection.
5.6 x 4.1 x 4.0 cm. Tarbuttite is normally rather boring…an often-ugly phosphate disparagingly referred to as a bat-poop mineral (because often it has formed under ancient caves layered with tens of thousands of years of deposition of mineral-rich bat guano). However, specimens from the Skorpion Mine are different. A new find appeared on the market in 2007, and I consider these transparent, truly gemmy, apple-green crystals to be the best of species for aesthetic quality by an order of magnitude. This is a rich small cabinet piece, solidly formed of tarbuttite, with swerving and wave-like sprays of crystals all over it. It is an outstanding example of a rare species.
4.2 x 3.9 x 2.3 cm. Tarbuttite is a very rare zinc phosphate and the Broken Hill Mine of Zambia is the Type Locality. Very gemmy, colorless to light gray tarbuttite crystals richly cover the sculptural gossan matrix plate on this fine old-time specimen from 1960s or earlier. Ex. Mullane Collection. Rare in this quality. Accompanied by an older Burminco label.
THis is a sparkling, translucent, pale green cluster of superb crystals for the species! Usually the material occurs as a thin crust on gossan matrix, but this piece is composed of two solid walnut-sized balls of freestanding crystals, intergrown into spherical aggregates. It would be considered VERY significant both for the species and the locality! 5 x 3.2 x 2.3 cm
An aesthetic, superb and old-time specimen of lustrous, transparent tarbuttite crystals to 5 mm nicely perched on matrix from the famous Broken Hill Mine of Zambia. Tarbuttite is a very rare zinc phosphate and Broken Hill is the Type Locality. This very fine piece comes with an outstanding, faded label from the 1929-1930 Philadelphia Academy of Sciences expedition led by the famous collector/mineralogist Samuel Gordon. Ex Richard Hauck Collection. This is an exquisite example of the species, with unusually sharp andf gemmy crystals. 3.4 x 2.2 x 2.1 cm
An elegantly formed specimen of large tarbuttite "sheaves" lightly decorated with minute white crystals of the new phosphate species Skorpionite, described formally in 2008 from this, the type locality. This specimen has rich coverage, and relatively larger crystals for the species compared to other pieces we have seen (meaning, they are barely eye-visible). In person, the color of the tarbuttite is a soft pastel green, very unusual and interesting! It is translucent when backlit.
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Rob Lavinsky, rob@irocks.com
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