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Mineral Specimens with Bixbyite
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ex. Dr. Edward David
A contrasting rhyolite matrix is the host for an unusual combo specimen. Splendent, jet-black crystals of bixbyite to 1.5 cm across are associated with gemmy, sherry-colored topaz crystals to 1.2 cm in length. This is one of the more desirable combinations from the Thomas Range. Seldom do you see so much bixbyite on one specimen, though, and with topaz as an association to boot!
SUPER-sharp, lustrous crystal! Complete all around!
This rare oxide is almost never seen in cut stones, and for any rare stone collector I can't imagine that you'd want to pass up this chance to add a very rare cut stone like this to your collection. The stone itself it opaque, but it’s a very hard to find gem of a rare species that is not often faceted. This stone would fit in very well amongst a black” stone collection. It might be small, but you'd be hard pressed to find another one. Most rare gem dealers don't even have a piece of this material to cut let alone to offer for sale in the finished product. This is one of the very few facetted Bixbyite stones that I've seen. A nice gem for a good price that will allow you cross one off your checklist of rare stones.
1.1 x 1.1 x 0.9 cm. A beautiful, sharp and lustrous, 9 mm, jet-black bixbyite crystal with modified octohedral corners and nicely perched on rhyolite matrix from Utah. Complete all-around, with only a trivial bit of contacting at the base of the crystal on one side. Ex. Carl Davis Collection.
2.4 x 1.9 x 1.8 cm. A splendent, sharp, 7 mm, black bixbyite cube with modified corners aesthetically set on porphyry matrix from the famous Type Locality - the Thomas Range in Utah. Ex. Dick Jones Collection.
3.9 x 2.9 x 2.4 cm. This remarkable specimen turned up in a small South African collection and when I showed it to Charlie Key, expert on all things African, his jaw dropped and he said something like "I never thought I'd see another..." He apparently had one from this same pocket, in the early 1980s, and has not had another since. This specimen he ranked very highly, and said they would both be among the best he knew of from the Kalahari fields. By worldwide standards, these would also have to command top spot except for a very few specimens from Utah, and those are of different habit entirely. The lustre and sharpness on these are amazing, they look carved. The large crystal is 1.6 cm, ranking very highly for the species. The sharpness and lustre, though, make this so distinct from Utah material of similar size that I thought at first this must be magnetite and not bixbyite. Charlie also confirmed the locality information.
3.1 x 2.2 x 1.7 cm. This specimen features a very large, sharp, highly lustrous, beautifully modified cubic crystal of Bixbyite measuring 1.8 cm sitting on a pair of prismatic, sherry colored, gemmy Topaz crystals.
6.4 x 3.5 x 3.2 cm. A mirror-lustrous bixbyite perched nicely on rhyolite matrix, measuring 9 mm on edge and 1 cm across. Minor topaz in association. Ex. Martin Zinn Collection.
3.6 x 1.9 x 1.3 cm. A gray rhyolite matrix is the natural pedestal here for a gemmy, cognac-colored topaz crystal measuring 2.85 cm in length, upon which is aesthetically perched a splendent, black, 3mm cube of the rare species bixbyite. Ex. Harold Urish Collection.
A superb and aesthetic specimen of a large, lustrous and perfect bixbyite cube, 9 mm x 7 mm, with modifed edges nicely perched on matrix from the famous Thomas Range of Utah. 4.0 x 2.7 x 2.7 cm
8.5 x 6.2 x 4.6 cm. A 7 mm, mirror-bright, jet-black bixbyite cube attached to 3-dimensional rhyolite matrix on this specimen from the Thomas Range of Utah. A couple of smaller bixbyites are a nice compliment. The large bixbyite has scalloped edges and no damage. Bixbyite is a rare manganese, iron oxide.
A stunning Thomas Mountain combo thumber, featuring a lustrous bixbyite crystal with a gemmy little topaz growing right on its side, both on a sparing matrix. 2.3 x 1.7 x 1.5 cm
5.5 x 4.6 x 2.3 cm. A very rich specimen with these sharp new braunites (to 4 mm), of incredible lustre and brightness, surrounding sharp bixbyite crystals to 6mm.
2.0 x 1.6 x 1.6 cm. This specimen features a very equant, lustrous, sharply formed bixbyite perched upon a natural pedestal of topaz and smaller bixbyites. This is a rather large bixbyite crystal, about as big as you can get and be perched upon something, matrix or association, and yet still be a competitive thumbnail size. Obtained from the collector, John Holfert, approximately 10 years ago.
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Rob Lavinsky, rob@irocks.com
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share specimen![Bixbyite with Topaz from Topaz Mountains, Juab County, Utah, USA [db_pics/pics/282aa.jpg]](db_pics/pics/282aa.jpg)
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