Whewellite

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Whewellite is a mineral, monohydrated calcium oxalate, formula Ca C2O4·H2O. Because of its organic content it was thought to have an indirect biological origin; this hypothesis is supported by its presence in coal and sedimentary nodules.

Excerpt from the Wikipedia article “Whewellite”, 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.