Greigite

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Greigite is an iron sulfide mineral with formula:Fe(II)Fe(III)2S4. It is a magnetic sulfide analogue of the iron oxide magnetite. Greigite occurs as microscopic (< .03 mm) isometric hexoctahedral crystals and as minute sooty masses. It is a bio-mineral produced by and found in magnetotactic bacteria. It is a pale pink to metallic blue-black mineral with a specific gravity of 4.049 and a Mohs hardness of 4 to 4.5.

It was first described in 1964 and named for Penn State mineralogist and physical chemist Joseph W. Greig (1895-1977).

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