Kolwezite is a rare mineral most commonly seen as small green hemispheres on Cobaltian Calcite specimens from the Congo. Here we have an entire vug filled with spherical masses of Kolwezite to 8mm in diameter. Comes with an old Gilbert Gautheir label.

Pair of intergrown, gemmy chisel-terminated Paracelsian crystals. Complete all around. Excellent example of the species, recently traded out of the British museum.

Partial cube of Platinum with a smaller attached crystal. Platinum crystals are much more rare than the nuggets and most are much more rounded than this one, in fact it was the sharpest, most well formed by far of a small lot of crystals I examined. I understand these are no longer being found.

Mound-shaped specimen covered by white drusy Quartz crystals and sprinkled with pink Rhodochrosite crystals. Old timer from the famous Butte mining district.

Bright metallic Calaverite in Quartz and in Quartz crystal lined vugs. Calaverite is is an uncommon telluride of gold with the chemical formula AuTe2. It was first discovered in Calaveras County, California in 1861.

Vuggy Limonite matrix with blue/green Aurichalcite and black Plattnerite. Good crystals all over, front and back and filling vugs.

Large single crystal of transparent Enstatite. This are typically found are partially etched crystals, but gem quality Enstatite is rare. This is the largest I've seen in some time.