What is the chemical formula for biotite mica that contains. potassium?

Zoe Gagnon asked Jan 5, 2023

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Zoe Gagnon asked Jan 5, 2023

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19 votes

K(Mg,Fe) 3(AlSi 3O 10)(F,OH) 2. it’s a repeating unit though.

Matt Pengelly answered Jan 11, 2023

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