Jacobsite

Rarity: Common

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At a glance

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Notion

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Science and technology

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What Wikipedia says

Jacobsite is a manganese iron oxide mineral. It is in the spinel group and forms a solid solution series with magnetite. The chemical formula is (Mn,Mg)Fe2O4 or with oxidation states and substitutions:

Excerpt from the Wikipedia article “Jacobsite”, 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.