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Mineral Properties and Uses

What is Marcasite?

Marcasite is an iron sulfide mineral. It has the same chemical composition as pyrite, however these two minerals are in different crystal systems (marcasite is orthorhombic and pyrite is isometric).

Physical Properties of Marcasite

Chemical Classification sulfide
Color pale bronze yellow
Streak grayish black
Luster metallic
Diaphaneity opaque
Cleavage poor
Mohs Hardness 6 to 7.5
Specific Gravity 4.9
Diagnostic Properties color
Chemical Composition iron sulfide, FeS2
Crystal System orthorhombic

Uses of Marcasite?

Very few commercial uses. Has been used as a source of sulfur and as an ornamental stone (many of the ornamental stones sold under the name of "marcasite" are actually pyrite).

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