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Mineral Specimens with Smithsonite
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Cadmian smithsonite with 2.5 cm rhombs with bright color. The cadmian deposits are layered into the outer layers of the large rhombohedral crystals, leaving white and yellow zones in cross-section. 10 x 9 x 5 cm
This is one of the best, most pristine examples of the rare cadmian smithsonite with large crystals and bright color that was found in one pocket in the early 1970's: that is still regarded as producing the best of its type. The cadmian deposits are layered into the outer layers of the large rhombohedral crystals(to about 1 inch in size!), leaving white and yellow zones when looked at in cross-section. However, this piece presents a solid mound of intensely-colored yellow to the viewer, and the color is not only more evenly distributed than on most such specimens but more intense as well. It is pristine, save for the bottom periphery. A comment from Dr. Bruce Cairncross, author of the book The Manganese Adventure: I can't be too specific re the Cd-smithsonites, but they were collected during the early 1970's, certainly pre-1975 when I started seriously collecting. Des Sacco confirms this period and he says there were'nt more than several found in a small pocket. 8 x 6 x 4 cm
Cadmian smithsonite with large crystals and bright color. The cadmian deposits are layered into the outer layers of the large rhombohedral crystals (to about 1 inch in size!), leaving white and yellow zones when looked at in cross-section. However, this piece presents a solid mound of intensely-colored yellow. Ex Nauke Oechslin Collection, purchased in Africa in the early 2000s. 17 x 15 x 12 cm
3.0 x 0.8 x 0.8 cm. A sharp, lustrous and gemmy, very elongated, pastel-pink, cobaltoan smithsonite scalenohedron from the Tsumeb Mine. Ex. Rob Smith Collection.
A SUPERB, complete all-around, two-toned brown stalactite of transparent to opaque lustrous smithsonite crystals to 1.4 cm from Tsumeb. You have to look hard to see the two trivial bruises and one cleaved crystal on this piece! 3 different views are given of this fine piece. 4.5 x 3.8 x 2.9 cm
A showy and damage-free crust of lustrous, botryoidal light-purple smithsonite encasing matrix from Choix, Sinaloa, Mexico. 8.3 x 5.5 x 4.7 cm
6.2 x 5.5 x 1.4 cm. This Choix smithsonite has really beautiful and unusual blue-green color, in addition to being translucent and having a fine shimmering luster.
3.9 x 3.2 x 1.8 cm. These unusual smithsonites that the Kelly produced are called "rice grain" for obvious reasons -- the little translucent "Kelly Blue" crystals have the form of grains of rice.
4.7 x 3.5 x 2.5 cm. Baryte is a rare mineral species of the old, upper oxidized zone at the Tsumeb Mine. This fine, two-sided specimen features lustrous, partially gemmy, chocolate-brown, tabular baryte crystals nicely clustered amongst lustrous, glassy, colorless smithsonite scalenohedrons. Ex. Robert Linck and Wilhelm Maucher Collections.
11 x 8.4 x 5.2 cm. A very weird, airy specimen with fat, striated, brownish-gray calcites on which are perched little bubbly, faintly green smithsonite crystals.
A very aesthetic and pristine plate of lustrous bladed smithsonite from Tsumeb. A tongue of matrix in the front of the specimen is covered with waterclear smithsonite blades. Behind the tongue is a solid ridge of colorless bladed smithsonite. The back of the specimen is solid bladed smithsonite. A most unusual and desirable Tsumeb piece. 5.3 x 4.3 x 2.5 cm
4.6 x 3.1 x 2.9 cm. Translucent, lustrous, dark tan balls and elongated crystals to 1.5 cm of intergrown smithsonite rhombs placed on a crust of coarsely crystallized calcite matrix from the Berg Aukas Mine of Namibia. The balls look like flower bulbs about to open. Ex. Rob Smith Collection.
4.3 x 3.2 x 3.2 cm. An old-time and fine specimen from the Oronogo Field of the Tri-State District. Oronogo lies about 5 miles north of Joplin, Missouri. Botryoidal, yellow, "turkeyfat" smithsonite richly covers the contrasting, 3-dimensional, sculptural, gray chert matrix. Likely dates to the late 1800s at the most recent.
9.6 x 7.9 x 5.5 cm. A very large, thick and rich example of Kelly Mine smithsonite showing the ideal blue-green color and shimmering, silky luster on shallow botryoidal forms. This crust measures over one cm thick.
14.8 x 8.3 x 4.0 cm. During growth this vug obviously was a thin septa in a pocket, standing mostly free of the walls, because smithsonite grew on both sides of this rind. The viewing side is covered in small clusters, to .6 cm across, of translucent, green, rice-grain, crystals of smithsonite. Their green color is due to copper content. It is a pretty enough smithsonite, anyhow. However, the key point to this specimen is the subsequent growth of malachite-coated, copper crystals, in a dendritic pattern, reaching 1.0 cm across. Ex. Richard Hauck Collection.
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Rob Lavinsky, rob@irocks.com
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share specimen![Smithsonite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-18797a.jpg]](db_pics/mdpics/MD-18797a.jpg)
![Smithsonite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-18798a.jpg]](db_pics/mdpics/MD-18798a.jpg)
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