Calcite
Photos
Roger Weller, geology instructor
wellerr@cochise.edu copyright 2011-R.Weller
calcite crystal with untarnished copper
inclusions-1
Keweenaw Peninsula of Northern Michigan

calcite
2196a
Photo is copyright free only for
non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.
Specimen is on display at Cranbrook
Institute of Science, Bloomfield Hills, Michigan.