ATHENA MINERALOGY |
Mineral: | BRAMMALLITE = PARAGONITE, ILLITE |
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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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