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ATHENA

MINERALOGY

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Mineral: BRAMMALLITE = PARAGONITE, ILLITE
Formula: Na0,65Al2▢Al0,65Si3,35O10(OH)2
Crystal System: Monoclinic
Group: Mica group. Interlayer-deficient mica. Dioctahedral
References: DAN Earth Sci. 208 (1973), 157; CM 36 (1998), 905
Type Locality: Llandybie, Dyfed, South Wales, United Kingdom
Comments: Dioctahedral interlayer deficient-micas. ▢ = vacancy

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