Tetradymite

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What Wikipedia says

Tetradymite is a mineral consisting of bismuth, tellurium and sulfide, Bi2Te2S, also known as telluric bismuth. If sulfur is absent the mineral is tellurobismuthite and the formula is then Bi2Te3. Traces of selenium are usually present.

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

Image: Auteur inconnu, CC BY 2.0, via Wikimedia Commons.