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ATHENA

MINERALOGY

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Mineral: BANNISTERITE
Formula: KCa(Mn,Fe2+,Zn)21(Si,Al)32O76(OH)16.12H2O
Crystal System: Monoclinic
Group: Stilpnomelane group related
IMA Number: 1967-005
References: NJMA 164 (1992), 169; HB2/1 (1995)
Type Locality: Benallt mine, Rhiw, Lleyn Peninsula, Caernavonshire (Gwynedd), Wales, United Kingdom

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