Apatite

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Notion

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Science and technology

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What Wikipedia says

Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH−, F− and Cl− ion, respectively, in the crystal.

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

Image: Burkhard Mücke, CC BY-SA 4.0, via Wikimedia Commons.