Alluaudite

Rarity: Common

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Science and technology

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What Wikipedia says

Alluaudite is a relatively common alkaline manganese iron phosphate mineral with the chemical formula (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3. It occurs as metasomatic replacement in granitic pegmatites and within phosphatic nodules in shales.

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

Image: Dave Dyet http://www.shutterstone.com http://www.dyet.com, Public domain, via Wikimedia Commons.