Roger Weller, geology instructor
email@example.com copyright 2010-R.Weller
Dioptase is a hydrous copper silicate that forms dark emerald-green stubby
crystals. It is a rare mineral that is highly prized by collectors because of its rich
color and well-formed crystals.
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.