Roger Weller, geology instructor
firstname.lastname@example.org copyright 2010-R.Weller
copper crystals from Bisbee, Arizona-1
Copper is one of the few elements that can naturally occur chemically uncombined
with other elements; this mode of occurrence is called "native". Some other
elements in this group that form in a native state are gold, silver, and sulfur.
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.