Roger Weller, geology instructor
firstname.lastname@example.org copyright 2010-R.Weller
Marcasite is also known as a white iron pyrite because its color on a fresh surface
is more pale than the brassy yellow of pyrite. This circular structure is known as a
marcasite disk ; it is created when the marcasite crystallizes between tight layers
Photo is copyright free only for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.