Greigite

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Science and technology

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What Wikipedia says

Greigite is an iron sulfide mineral with the chemical formula Fe2+Fe3+2S4. It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). It was first described in 1964 for an occurrence in San Bernardino County, California, and named after the mineralogist and physical chemist Joseph W. Greig (1895–1977).

Excerpt from the Wikipedia article “Greigite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Perditax, CC0, via Wikimedia Commons.