Twinned Crystals Cochise College
Crystals and Crystal Models
Virtual Geology Museum Hall of Minerals
Twinned Crystals Roger Weller, geology instructor
wellerr@cochise.edu
copyright 2008-R.Weller
crystals of minerals
gypsum-1
swallow-tail twin
gypsum
Photo is copyright free for non-commercial
educational uses.
Just credit photo to R.Weller/Cochise College.