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jet-black twinned crystal of Ferberite (twinned along the a{100} face)
I’ll bet that you don’t have an Augelite with Chlorargyrite in your collection
Specimen # BROOK31904
Specimen# CO712B83
gemminess and unique color
Calcite Bolivia metallic jet-black twinned crystal of FerberiteA beautiful crystallized plate of nearly colorless, gemmy, modified rhombohedra of Calcite from the world famous Sherman Mine in Leadville. This locality is arguably the most productive specimen producer in Leadville, despite the fact that over 10 million ounces of Silver came out in a period lasting around 11 years (started 1968 1970 and reopened 1975 1982). The Leadville mining district was the most productive silver mining region in Colorado. As of
