Roger Weller, geology instructor
firstname.lastname@example.org copyright 2011-R.Weller
Gypsum is hydrous calcium sulfate. When it occurs in a clear, transparent form,
it is also known as selenite. When gypsum is allow to crystallize in an unrestricted
environment, it forms the typical shape seen below.
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.