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ATHENA

MINERALOGY

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Mineral:BRAMMALLITE
Formula:Na0.65Al2[]Al0.65Si3.35O10(OH)2
Crystal System:Monoclinic
Strunz Nr:8/H.13-20
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


Mineral:BRAMMALLITE = a series name
Formula:(Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H2O] (?)
Crystal System:Monoclinic
References:DAN Earth Sci. 208 (1973), 157; CM 36 (1998), 905
Type Locality:Llandybie, Dyfed, South Wales, United Kingdom
Comments:Na rich Illite

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