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australian biotite mining ireland

Sep 01, 2017 Biotite or black mica, K(Mg,Fe 2) 3 (Al,Fe 3)Si 3 O 10 (OH,F) 2, is rich in iron and magnesium and typically occurs in mafic igneous rocks. Biotite is so common that its considered a rock-forming mineral. It is named in honor of Jean Baptiste Biot, a French physicist who first described the optical effects in the mica minerals.

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