Berthierite

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What Wikipedia says

Berthierite is a mineral, a sulfide of iron and antimony with formula FeSb2S4 (FeS·Sb2S3). It is steel grey in colour with a metallic lustre, which an iridescent tarnish can cover. Because of its appearance, it is often mistaken for stibnite (Sb2S3, an antimony trisulfide mineral, free of Fe2+ sulfide).

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

Image: http://libraryphoto.cr.usgs.gov/htmllib/btch555/btch555j/btch555z/btch555/byu00131.jpg - Transferred from en.wikipedia to Commons., Public domain, via Wikimedia Commons.