marcasite
Noun. (geology) A pale mineral, FeS2. Marcasite is physically and crystallographically distinct from pyrite, although the two have the same chemical composition.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.