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Brinrobertsite
Type Locality
Nant Ffrancon Formation, Aber-Ogwen, Bangor, Gwynedd (Caernarvonshire), Wales, UK
Mineral Data
Na
0.3
Al
4
(Si
4
O
10
)
2
(OH)
4
·3.5 H
2
O
Strunz:
9.EC.60
Physical Properties
Streak:
white
Hardness:
1.0 - 0.0
