More on white iron pyrites from Fact Monster:

• marcasite - marcasite marcasite or white iron pyrites,a mineral closely resembling and having the same chemical ...
• pyrite - pyrite pyrite or iron pyrites, pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs ...
• Encyclopedia: Mineralogy and Crystallography - Encyclopeadia articles concerning Mineralogy and Crystallography.

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