CUPROADAMITE
Specimen cad-4

Dims: 4" x 2-1/2" x 2-1/2"

Wt: 13.5 oz

Laurion, Greece

At first glance, one may think that this is a smithsonite specimen, with dozens of blue-green bulbous formations on a heavy hematite/goethite matrix. Closer examination will reveal that each "blob" is a small, radiating cluster of semitransparent Cuproadamite crystals. Each cluster averages 1/8 inch in diameter, and contains crystals that are much too large to produce the silky, "melted wax" sheen of smithsonite. In a few places, the clusters are packed closely enough to intersect, making small areas that are coated with crusts of the mineral. Their color is unusual and splendid, with the dark, rust-brown of the matrix adding the perfect backdrop. Do you have one of these??

Dims: 1.8" x 1.3" x 1.1"(4.6 x 3.3 x 2.8 cm)

Wt: 1.54 oz.(43.8 g) w/ base

Tsumeb, Namibia

This particular specimen actually consists of two separate specimens! The above dimensions apply to the larger piece, and the weight represents both specimens and the bottom of a plastic specimen box. The first specimen consists of a small piece of what appears to be quartzite that is covered by a crust made up of both goethite and dolomite or calcite. There are a few very small moss-like Cuproadamite clusters made up of almost microscopic radiating needles. They have a bright green color, no luster, and seem to be opaque. There are also several patches of noncrystalline or massive Cuproadamite on the host rock. The other specimen has dimensions of 1.0 x 0.5 x 0.5"(2.5 x 1.3 x 1.3 cm) and is made up entirely of Cuproadamite crystals. They have the same bright green color, a pearly luster, and are translucent. They occur as flat blades with wedge-shaped terminations, several of which have small areas of near-transparence on their tips. The largest of these crystals measures 0.3 x 0.2 x 0.1"(8 x 4 x 1 mm) and rises up from the rest of the specimen, so as to be quite visible. Though there is substantial damage to the specimen, the crystals show good form and are much larger than those on the other specimen. Both pieces are attached to a specimen box's base with a removable putty.

Dims: 2.8" x 2.0" x 1.2"(7.1 x 5.1 x 3.0 cm)

Wt: 3.82 oz. (108.2 g)

Mina de Ojuela, Mapimi, Durango, Mexico

Three hemispherical clusters and a single crystal of Cuproadamite rest near or inside a crevice in the goethite/limonite host rock of this specimen- all are in excellent condition, showing no damage. The largest of the clusters measures 0.5" (1.3 cm) in diameter, and like one other cluster, has a good round, acicular form. The other cluster is wedged inside the crevice, which prevented a symmetrical growth. The individual crystal is also sheltered by the crevice and measures at least 0.1" (3 mm) in each dimension. All have a deep olive-green coloration with a hint of blue and a bright, adamantine luster, and are moderately translucent. There are many other Cuproadamite crystals scattered on the host rock, but these are nearly microscopic in size, and there is part of a vein of semicrystalline Cuproadamite that is easily visible.

Dims: 2.4x2.1x0.8" (6.1x5.4x2.0 cm)

Wt: 1.80 oz. (51 g)

Tsumeb Mine, Tsumeb, Namibia

This small hand specimen consists almost entirely of intergrown cuproadamite crystals. On the top, many of them are exposed, revealing the diamond wedge shaped terminations of this mineral. These crystals are up to 4mm in length, and are a translucent green-turquoise in color, and not the purple often asociated with cuproadamite. Another unusual characteristic is that this specimen flouresces a deep purple under long-wave UV (not the bright green of adamite). The back of this specimen is covered with a thin druse of a very sparkly gray mineral which I have not identified.