Marcasite
| FeS2
This sample of marcasite is displayed in the Smithsonian Museum of Natural History. Marcasite is a sulfide mineral of iron with the composition FeS2. The sample at left is about 15 cm across and is from Northern Indiana stone quarry, Indiana.
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This sample of marcasite is about 15 cm across and is from Picher, Oklahoma.
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This sample of marcasite is about 14 cm across and is from Montreal, Wisconsin.
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Marcasite has the same structure as safflorite.
Mindat: Marcasite
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