Bournonite on Pyrite (excellent “cogwheel”)

Bournonite on Pyrite (excellent “cogwheel”)A 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

layered blades of Ferberite on the side

it is remarkably difficult to obtain such well crystallized

To the best of my knowledge

Very little damage and really striking for the species and the locality

These are the only Copper “sheets” that I have seen from Corocoro

caterpillar (Lepidoptera larva)

He states that Paravauxite is the most abundant of all the "Vauxites" from this mine

You can read Willard's bio on the Mineralogical Record website

The quality is good for this locality and is almost irreplaceable in today's market

Though matrix specimens of Phosphophyllite do exist

Not since the days of World War II has there been such a remarkable find of this material

most often as blades