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Mineral Specimens with Diamond
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13.4 x 10.5 x 6.4 cm. "Herkimer Diamond" quartz occurs in hard dolostone and is hard to extract - crystals this large are seldom extracted on matrix. The crystal measures 5 cm across. It is razor-sharp and has NO damage. Also significant is the fact that instead of sitting on grey rock, it is on a bed of sparkly brown quartz crystals.
13.9 x 11.9 x 9.3 cm. These are small, "diamond"-like crystals, of the intense gemminess that makes these crystals so famous. They measure to 1.3 cm. As with the other specimen, these crystals are on a bed of sparkly, light taupe-colored quartz crystals (drusy) rather than the usual gray rock, which adds to the attractiveness.
1.2 x 1.2 x 1.1 cm. A STRIKING, LARGE, 12.66 carat, twinned octahedral diamond crystal from an unknown locality in Zaire. This large, translucent, honey-brown beauty has adamantine, frosted lustre and the crystal twinning is visible on all sides of this pristine, large and uncommon gemstone.
7.9 x 7.2 x 6.4 cm. Looking jewel-like in its natural dolomitic vug is a doubly-terminated, transparent, colorless quartz crystal, measuring 2.75 cm in length. This specimen dramatically illustrates how crystals can form in the small cavities within rocks. Ex. Harold Urish Collection.
8.3 x 5.4 x 3.3 cm. A rare Brazilian specimen of a gemmy, glassy and lightly frosted, 6 mm, diamond crystal nestled amongst conglomerate river pebbles from the famous Diamantina River of Minas Gerais. Ex. Ed Swoboda Collection.
One of a group of interesting cubic diamond crystals with various colors. These are all colorful, translucent, and moderately lustrous. The rightmost photo shows the specimen backlit with a flashlight in the dark 0.7 x 0.6 x 0.6 cm
A bright stone with silky lustre and pearlescent color to it. It is, internally, fairly gemmy and translucent to transparent in person 0.9 x 0.6 x 0.6 cm
4.8 x 3.7 x 1.8 cm. A fabulous floater Herkimer quartz (these are often called "Herkimer Diamonds" due to their brilliance). Two intergrown crystals show the incredible clarity that makes these so famous. You can see the typical dark inclusions of bituminous inside. The larger crystal is absolutely glass-clear.
Okay, so it's a Herkimer quartz, but - how often do you see a thumbnail this good - of ANYTHING? Three diamond-like crystals perfectly arranged on just the merest bit of matrix - you just have to love it, "Herkimer diamond" or not. 2.5 x 2.3 x 1.2 cm
4.3 x 3.6 x 3.0 cm. This is a sharp quartz specimen from the classic "diamond mines" near Herkimer, New York. It is so sharp, so gemmy, it looks carved, hence their nicknames. The crystal is perfectly balanced on a natural little pedestal of rock matrix, attached at its base. Ex. Helmut Bruckner Collection.
18.9 x 13.9 x 12.8 cm. You generally see these so-called "Herkimer Diamonds" (quartz) alone or in groups, apart from the matrix. But this very large specimen is really interesting in that you get to see them in their natural setting. They are found in large hard-rock boulders that must be split apart (the labor is supposedly quite intense to find these) in order to search for and expose the little pockets in which they have formed. They look like diamonds glittering almost impossibly inside the gray, dull host rock - as if they were place there. There are two separate pockets on this one specimen, with crystals up to 1.5 cm.
0.5 x 0.4 x 0.3 cm. A gemmy, sharp, 0.55 carat, colorless to light tan, cuboctahedral diamond crystal from the famous Crater of Diamonds State Park of Arkansas. Here is a highly representative, moderately large diamond crystal from this historic locale and the Irv Brown Collection.
This specimen features a SHARP, stepped octahedral diamond crystal measuring 6 mm, NATURALLY embedded in host rock! Note that a lot of supposedly matrix diamonds are simply fabricated, but this crystal is partially enclosed in the rock in such a way that it could not be faked. This is an excellent matrix diamond in this price range and it has excellent form and lustre - such that it really "jumps out" at you from a distance! Better in person! Obtaining matrix diamonds is difficult because of the heavy security and automation at modern diamond-mining operations to remove temptation from "the human element" as I have heard it called euphemistically in the trade. Most of these specimens are either very old or came out during a temporary breakdown in order at the dissolution of the old USSR. 3.5 x 2 x 1.2 cm
12 x 9 x 5 cm. Ed David had a huge suite of several dozen very fine Herkimer quartz specimens in his collection, assembled over 30 years of collecting. This was, to me, his prize Herkimer quartz specimen. It is a phenomenally gemmy crystal group on matrix, with calcite, acquired in 1998 from miner Nancy Koskie. The calcite association is highly unusual. Not only is there an association, but the quartzes are of highest quality in terms of clarity, brightness, and form. The cluster is attractively perched on the matrix.
1.3 x 0.8 x 0.8 cm. A fine, 6.53 carat cluster of two, intergrown, sharp, honey-yellow cubic diamond crystals from Congo (Zaire). The crystals are lustrous, translucent and are nicely frosted or etched.
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Rob Lavinsky, rob@irocks.com
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share specimen![Quartz (Var: Herkimer Diamond) from Herkimer Co., New York, USA [db_pics/mdpics/MD-167890a.jpg]](db_pics/mdpics/MD-167890a.jpg)
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![Quartz (Var: Herkimer Diamond) from Herkimer Co., New York, USA [db_pics/mdpics/MD-212101a.jpg]](db_pics/mdpics/MD-212101a.jpg)
![Quartz (Var: Herkimer Diamond) from Herkimer Co., New York, USA [db_pics/mdpics/MD-212101b.jpg]](db_pics/mdpics/MD-212101b.jpg)
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