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Mineral Specimens with Quartz
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8.2 x 7.5 x 0.3 cm. A MOST unusual, sharply color-zoned slice of amethyst from a bizarre stalactitic growth. This was found in India, I know not when.
4.1 x 3.8 x 1.3 cm. A textbook twinned Quartz from the classic Japanese localities that were studied intensively for crystallography in the 1800s. Superb equant form, with only minimal damage (slight wear to the termination edges). Ex. American Museum of Natural History.
5.5 x 4.0 x 1.7 cm. The scheelite is exceptional for Zinnwald ...this is CLASSIC old scheelite from a classic locality, with crystals to 9mm, perched on a terminated quartz shard. This is very beautiful and aesthetic! Ex. American Museum of Natural History and shows a Bement collection numbering on the bottom, along with the "arrow" that the AMNH curator Gratacap used to show alignment of specimens on a display shelf. This indicates the piece was on display after the donation of the Bement collection around 1910, by JP Morgan.
9.5 x 7.1 x 6.2. Rising majestically from their matrix of mica are three magnificent, glassy and gemmy smoky quartz crystals. The largest of these aesthetic crystals stands 9.0 cm in length. Superb example from the Erongo Mountains. Ex. Charlie Key.
13.8 x 4.4 x 3.3 cm. There are Brazilian quartzes, and then there are Brazilian quartzes. This one is special. The clarity is just unbelievable, like the purest water. On the surface are subtle striations which give it a ripping beauty. And, to make it very interesting as well, this big crystal is penetrated by smaller, slender crystals with a slight iron oxide coating that gives them some color, so that you can see them jutting through the back of the crystal, from the display face in front. These are rare positive cast inclusions, quite uncommon in quartz from any locale! Ex. Michel Jactat Collection (he is a retiring French dealer).
4.2 x 2.5 x 2.4 cm. A VERY unusual combo specimen from Brazil! What you have is this weird, melty-looking rose quartz, on the side of a euhedral quartz crystal, that has wrapped itself around a crystal of dark green tourmaline! The tourmaline was able to be removed with one of its terminations intact. Unique!
15.5 x 5.4 x 4.4 cm. This is a very large, doubly-terminated quartz crystal, made really distinctive by the natural etching from corrosive solutions in the pocket in which it formed - which give it this complex surface with interesting micro-faces and etch pits. The crystal is very transparent through the center.
5.3 x 2.7 x 1.7 cm. An amethyst crystal from Brazil showing dramatic sceptering, with a cap that is an incredibly intense purple on a lighter-colored stalk. The camera could not capture it, but under strong light this crystal lights up a shocking violet color. Collection of French dealer in Brazilian minerals, Michel Jactat.
5.5 x 2.4 x 1.9 cm. An incredibly cool specimen from Brazil, where a super-gemmy quartz crystal has wrapped itself around an equally gemmy, in fact gem-grade and cutter quality, tourmaline crystal! When this happens, these typically cannot be removed with terminations intact, but in this case, the most important termination of the tourmaline, sticking up from the top of the quartz termination, IS intact! The clarity of both the quartz and the tourmaline make this really special. There is a smaller crystal in back, also with one termination complete. Collection of French dealer in Brazilian minerals, Michel Jactat.
4.5 x 2.9 x 2.7 cm. A BIZARRE specimen of rose quartz resulting from dramatic etching by corrosive solutions in the pocket. What you have is four "walls" of transparent pink rose quartz, attached to a partial crystal of smoky quartz; you can see two sharp faces of the smoky quartz crystal down in the center of these four "walls." It is hard to say what the form of the rose quartz was originally, before the etching took place that resulted in this unique specimen. Collection of French dealer in Brazilian minerals, Michel Jactat.
7.6 x 5.4 x 4.8 cm. This specimen is from a batch we got of very interesting quartz specimens from KENYA - including large, colorless crystals, and these more modest-sized amethystine crystals. The color is isolated in these intense blushes inside the otherwise colorless quartz, as with Brandberg crystals. The exterior surface of these is rather rough.
2.4 x 1.9 x 1.0 cm, 2.2 x 1.4 x 1.0 cm, 1.9 x 1.9 x 1.1 cm. Three specimens of the most sought-after variety of quartz, from the Pitorra Mine in Brazil. These three nice thumbers have good transparency and pretty pastel pink color. One is a straightforward crystal cluster, another is naturally etched into a strange form, and the third is in-between!
2.7 x 2.2 x 1.1 cm. These famous "fire agates", at their best, have all the flash of opals and are often confused with opal. They actually are formed by a thin layer of limonite covered in hard, transparent quartz, which is then polished to reveal the color. The good ones are quite rare; they are sometimes used in jewelry, though very hard to work with, so not many jewelers or lapidaries can work with the material, to get them exactly like this to where the colors come out, either for jewelry or just to keep as specimens. At any rate, here is a gorgeous specimen with a wonderful play of green and red.
5.5 x 3.9 x 3.7 cm. A water-clear quartz crystal all shot through with glimmering, golden needles of rutile.The metallic mineral is hematite, frequently associated with these. The faces of this crystal are so lustrous and clear, it is just a great example of one of these, really striking!
16.5 x 12.0 x 5.5 cm. A DRAMATIC Sweet Home Mine, V-shaped, LARGE CABINET combination specimen from the Sulfide Pocket of the Tetrahedrite Drift. Water-clear quartz needles are richly and aesthetically covered with lustrous hubnerite blades to 1.8 cm, mirror-bright, striated, brass-yellow pyritohedrons and a scattering of tetrahedrite - all on a matrix of milky quartz. This is CLASSIC Sweet Home association material, SELDOM available in this quality and size. Hubnerite is a particularly desirable and uncommon accessory species. All fine Sweet Home pieces are escalating in price, with the mine now closed.
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Rob Lavinsky, rob@irocks.com
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share specimen![Quartz (Var: Amethyst) from Jalgaon District, Maharashtra, India [db_pics/mdpics/MD-155002a.jpg]](db_pics/mdpics/MD-155002a.jpg)
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