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ATHENA

MINERALOGY

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Mineral: STILPNOMELANE
Formula: K(Fe2+,Mg,Fe3+,Al)8(Si,Al)12(O,OH)27.2H2O
Crystal System: Monoclinic / Anorthic (Triclinic)
Group: Stilpnomelane group
IMA Number: 1971 s.p.
References: MM 42 (1978), 361; HB2/2 (1995)
Type Locality: Obergrund, Zuckmantel, Silesia, Poland

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