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ATHENA

MINERALOGY

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Mineral: NATROALUNITE-2c
Formula: (Na,Ca,K)2Al6(SO4)4(OH)12
Crystal System: Rhombohedral (Trigonal)
Group: Alunite supergroup. Alunite group
References: AM 67 (1982), 114; HB5 (2003); L 11 (2009), 40; MM 74 (2010), 919
Type Locality: Monzo Hot Springs, Kusatsu-Shrane volcano, Okumanza, Gumma pref., Japan

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