Domeykite

Rarity: Common

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Science and technology

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What Wikipedia says

Domeykite is a copper arsenide mineral, Cu3As. It crystallizes in the isometric system, although crystals are very rare. It typically forms as irregular masses or botryoidal forms. It is an opaque, white to gray (weathers brassy) metallic mineral with a Mohs hardness of 3 to 3.5 and a specific gravity of 7.2 to 8.1.

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

Image: http://libraryphoto.cr.usgs.gov/htmllib/btch566/btch566j/btch566z/btch566/byu00479.jpg - Transferred from en.wikipedia to Commons., Public domain, via Wikimedia Commons.