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Brammallite

Type Locality
Llandybie (Llandebie), Carmarthenshire (Dyfed), Wales, UK
Mineral Data
(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
Variety Of: 
Strunz: 
9.EC.25
Physical Properties
Colour: 
White
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
2.5 - 3.0