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Brammallite

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SHS666839

Brammallite

Description Tabs

Description
Locality: 
Llandybie, Carmarthenshire, Wales, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.4 × 0.4 cm
Description

Brammallite in capsula

Mineral Data
What's on the rock

Brammallite

Variety Of: 

Illite

Formula: 
K0.65Al2.0[Al0.65Si3.35O10](OH)2
Hardness: 
1.0 - 2.0
Formula: 
(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
Strunz: 
9.EC.25
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Colour: 
White
Streak: 
White
Type Locality: 
Llandybie (Llandebie), Carmarthenshire (Dyfed), Wales, UK