Thursday, August 23, 2012

Gemstone of the Week: Covellite

(Covellite image from

Covellite is a rare and beautiful copper sulfide.  It was first discovered in 1832 as a volcanic sublimate on Mount Vesuvius by Nicolas Covelli, after whom it is named.  Covellite tends to be indigo-blue to black and often has faint tinges of purple iridescence. Usually, Covellite occurs as a product of alteration of another copper sulfide, such as, Chalcopyrite, Chalcocite, and Bornite.  Covellite makes beautiful cabochons, but as jewelry you will have to be very careful with it as it only has a hardness of 1.5-2.  Some of the places it may be found include: Germany, Serbia, Australia, Sardinia, and the states of Montana and Arizona.

No comments:

Post a Comment