Tephroite

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Notion

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Science and technology

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What Wikipedia says

Tephroite is the manganese endmember of the olivine group of nesosilicate minerals with the formula Mn2SiO4. A solid solution series exists between tephroite and its analogues, the group endmembers fayalite and forsterite. Divalent iron or magnesium may readily replace manganese in the olivine crystal structure.

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

Image: Modris Baum, Public domain, via Wikimedia Commons.