This very lustrous, large rough black diamond mined in Canada weighs 91.40 carats and has crystallized in a natural cube shape. Black diamonds owe their opaque color to natural impurities in the crystal lattice and make beautiful collector's pieces. This

A complex cluster of gemmy, prismatic crystals of Mimetite interspersed with green Duftite. Fluoresces red-orange under SW UV. An endlessly explorable small cabinet classic. Tsumcorp Mine, Tsumeb, Namibia. 2", x 1.5" x 2.5", 5 oz

Bayldonite is a rare secondary mineral that occurs in oxidized zones of polymetallic deposits. This is a nicely sparkling example on a dynamic matrix. A few, completely covered, crystals of Wulfenite accompany. Under loupe inspection a scattering of miniature crystals of Calcite can be found. Tsumcorp Mine, Tsumeb, Namibia. 2", x 1.3" x 2", 2.5 oz

Complex and multicolored, this piece features prismatic crystals of Mimetite punctuated by hundreds of tiny green clusters of Malachite on both sides. An endlessly explorable classic. Tsumcorp Mine, Tsumeb, Namibia. 2.5", x 2" x .75", 2.4 oz

Sprays of prismatic crystals of Mimetite punctuated by the occasional crystal of green Malachite, which continue across the matrix as a dusting. The mass is largely red-clear gemmy Willemite crystals. An endlessly explorable small cabinet classic. Tsumcorp Mine, Tsumeb, Namibia. 2", x 1.5" x 2.5", 5 oz

Matte black Goethite provides the perfect contrasting canvas for hundreds of gemmy, bright red crystals of Vanadinite. The crystallization wraps around the matrix of this large cabinet mineral specimen. Taouz Caidat, Morocco. 5.25" x 1.75" x 4.5", 1.15 lbs