Dolomite on sulfides Richard A. Kosnar is probably the most difficult

is probably the most difficult to obtain

This crystal is an unusual shade of green

This small cabinet size specimen features excellent

This mine is still active today and bears the unique distinction of producing the only GEM quality (facet grade) Cassiterites from any mine in Bolivia Considering the millions of tons of tin ore that Bolivia has yielded

A handful of sharp

Dolomite on sulfides Richard A. Kosnar is probably the most difficultA wonderful display specimen from the famous Black Cloud mine featuring razor sharp, vitreous rhombohedra of cream colored Dolomite some of which are oriented into spherical aggregates which are sitting atop black Sphalerite, silvery Galena and golden Pyrite matrix. Excellent quality and wonderful aesthetics. The Black Cloud Mine was one of the most famous specimen producing locales in Leadville and was one of the last operating mines in Colorado when