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ATHENA

MINERALOGY

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Mineral: FERRIDRAVITE = POVONDRAITE, Fe rich DRAVITE or BUERGERITE
Formula: (Na,K)(Mg,Fe2+)3Fe3+6(BO3)3Si6O18(O,OH)4
Crystal System: Rhombohedral (Trigonal)
Group: Tourmaline group
References: AM 96 (2011), 895

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