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Mineral Specimens with Copper
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This is the most sculptural of the small lot of Keweenaw Peninsula silver and copper "half-breeds" that I purchased a couple of years ago. The silver is shaped like a boot or sock. It is also unusual, in that, there is far more silver than copper. Typically, there is more copper than silver.. Here, this hefty thumbnal nugget has more silver than copper. 2.0 x 1.8 x 0.3 cm
This is really an amazing pseudo. To find Copper in such sharp hexagonal habit, even knowing that it is a pseudo, still blows the mind. 1.7 x 1.6 x 1.6 cm
Still one of the most attractive of the Michigan specimens, this fine calcite crystal has the copper well exposed within the crystal (it is unusually clear, and nicely exposed externally in the back. An excellent example of the Copper & Calcites! 2.6 x 2.2 x 1.8 cm
A very nice cluster of lustrous perfectly colored Copper crystals with the largest crystal being twinned. Incredible old, antique patina and sharp form! 2.4 x 1.3 x 1.3 cm
Intricate mass of crystallized wires that resembles a broomstick. There are clear crystals visible, as well as some possible twinning. This is an interesting specimen from quite the remote location. 3.2 x 1.9 x .8 cm
Secondary growths of Copper crystals on one long, possibly twinned, copper crystal that is shaped like a rectangular bar and most unusual! With such good color, luster, and form, this is a very fine thumb. 3 x 1.3 x 1 cm
This is a fantastic specimen of any size. The balance of the piece, combined with a superb gemmy Calcite whose slightly silky luster gives it an incredible ‘glow’, gives this an aesthetic appeal beyond reproach. This is one of the few specimens that causes me to draw in my breath every time I look at it. 2.2 x 2.2 x 1.4 cm
2.5 x 2.5 x 1.0 cm. A fine copper specimen from the Turjinskii Mine of the Urals. Two diverging columns of sharp copper crystals rise up from the main shaft, which includes a very sharp copper octahedron. One column is capped by a horizontal, 1.4 cm spinel twin. All of the crystals have fine patina and lustre. The piece is partly intergrown with native silver and a bit of quartz. Dating to the 1800s. Ex. St. Aubyn College, Richard Barstow and George Elling Collections.
This large copper-silver “halfbreed” is from the world renowned, but long depleted, copper deposit in the Upper Peninsula of Michigan. The specimen is a slightly rounded nugget with good eye appeal. With the unusual silver knob atop, it is a very compelling specimen and unusual in teh richness of both metals without showing intermixing. Over 9 ounces, or 265 grams! 8.3 x 4.6 x 2 cm
A shockingly unique copper specimen of considerable elegance, with two dramatic spinel-twinned crystals rising from matrix of calcite and copper. I have never seen such a specimen froman African locality, and the closest have been from Onganja in Namibias...for Zaire, I think this is a very special piece, indeed. It is complete and 3-dimensional all around. 5 x 2.9 x 2.8 cm
A sculptural old Michigan copper specimen, with a wonderful 2-cm euhedral crystal growing right on top! That crystal is unusuall good and makes this piece stand out. 5.9 x 3.5 x 1.3 cm
A fine mini of well-crystallized copper from Michigan, with nice chunky crystals all over, and a wonderful penny-bright patina. 4.8 x 4 x 1.4 cm
Killer Aussie thumber of crystallized copper! 3.3 x 1.7 x .5 cm
An excellent and aesthetic floater nest of dendritic, spinel-twinned, cuprite-coated copper crystals from a very uncommon Arizona locality, the Old Dominion Mine of Gila County. The cuprite coating adds a beautiful patina to this showy piece. 4.0 x 3.5 x 2.5 cm
A very fine miniature of crystallized copper from the prized Bisbee locality! Some of the long, finger-like crystals measure over 1.5 cm. It is of course quite hard to get fine old Bisbee pieces at decent prices these days. 3.4 x 3 x 2.3 cm
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Rob Lavinsky, rob@irocks.com
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share specimen![Silver, Copper from Keweenaw Co., Michigan, USA [db_pics/mdpics/MD-38448a.jpg]](db_pics/mdpics/MD-38448a.jpg)
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