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. Marcasite often forms complex twinned
crystals with a saw-like top referred to as "cockscomb marcasite."
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Just credit photo to R.Weller/Cochise College.