Ferberite, Quartz, Sphalerite

Outstanding, large, highly-aesthetic specimen featuring large, razor-sharp, highly-lustrous black Ferberite crystals arranged across a 3-dimensional matrix of gemmy undamaged clear quartz crystals with well-formed black sphalerite crystals, from the Kami Mine in Ayopaya Province, Cochabamba, Bolivia. For the species (ferberite) the quality is very high with this piece. Mark Cross photo.