Vulcanite

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Notion

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Science and technology

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What Wikipedia says

Vulcanite is a rare copper telluride mineral. The mineral has a metallic luster, and has a green or bronze-yellow tint. It has a hardness between 1 and 2 on the Mohs scale (between talc and gypsum). Its crystal structure is orthorhombic.

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

Image: David Hospital, CC BY-SA 4.0, via Wikimedia Commons.