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ATHENA

MINERALOGY

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Mineral: DORRITE
Formula: Ca2Mg2Fe3+4Si2Al4O20
Crystal System: Anorthic (Triclinic)
Group: Sapphirine supergroup. Rhönite group
IMA Number: 1987-054
References: AM 73 (1988), 1440; HB2/1 (1995); EJM 11 (1999), 743
Type Locality: Durham Ranch, Gillette, Reno Junction, Wyoming, USA

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