Topgems Cabochons
Fine designer cabochons of ocean jasper, marra mamba tiger eye, hawks eye, Biggs and Blue Mountain jasper, Mookaite, Fire Agate, Fire Obsidian and others.
Covellite (aka covelline) is a crystalline form of copper sulfide (CuS). In appearance it is a deep metallic indigo blue (tarnished to purple or black) with iridescent yellow and red flashes. It is associated with chalcosite in zones of secondary enrichment (supergene) of copper sulfide deposits. Commonly found with and as coatings on chalcocite, chalcopyrite, bornite, enargite, pyrite, and other sulfides. Often occurs as pseudomorphic replacements after other minerals. Very rare occurrence as a volcanic sublimate at Mount Vesuvius the site of its discovery or first description by N. Covelli (1790 - 1829).
http://en.wikipedia.org/wiki/Covellite
All the covellite I work with is from Butte, Montana USA. It has also been found in other parts of the world Germany; Austria and South America to name a few.
