Bournonite on Pyrite (excellent “cogwheel”) red modified scalenohedra of Calcite sitting

modified scalenohedra of Calcite sitting on underlain "chlorite" on matrix

white/colorless Quartz crystals aesthetically flaring out of the sides

and the twins from Tasna are a favorite among collectors

This mine is actually the LARGEST Cassiterite deposit in the world but is best known for its phosphate species

Bournonite on Pyrite (excellent “cogwheel”) red modified scalenohedra of Calcite sittingA very good quality, COMPLETE, sharp, lustrous, silvery colored classic cogwheel twinned crystal group is aesthetically flaring off lustrous, golden, octahedral metallic Pyrite matrix. The cogwheel is essentially undamaged, save the tiniest of Wilbers on the edge. Its amazing to me that you can see all sides of the cogwheel as its not buried into the Pyrite matrix, which is EXCEPTIONALLY RARE in my experience with the material. If youre a Bolivian