Ultramafic rock

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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

Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).

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

Image: Ariel Provost (pour la traduction des labels en français), CC BY-SA 4.0, via Wikimedia Commons.