Roger Weller, geology instructor
email@example.com 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
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Just credit photo to R.Weller/Cochise College.