Cubanite

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What Wikipedia says

Cubanite is a copper iron sulfide mineral that commonly occurs as a minor alteration mineral in magmatic sulfide deposits. It has the chemical formula CuFe2S3 and when found, it has a bronze to brass-yellow appearance. On the Mohs hardness scale, cubanite falls between 3.5 and 4 and has a orthorhombic crystal system.

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

Image: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.