Calcite
Photos Roger Weller, geology instructor
wellerr@cochise.edu copyright 2008-R.Weller
gray calcite crystal-2
Close up view of fractured surface shows
rhombohedral cleavage and double
refraction.

Photo is copyright free for
non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Specimen from Cochise College collection
cochise013