Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:BRINROBERTSITE
Formula:Na0.3Al4(Si4O10)2(OH)4 · 3.5H2O
Crystal System:Monoclinic pseudo Hexagonal
Strunz Nr:8/H.19-10
Group:Smectite Group
References:MM 66 (2002), 605; MR 4 (2004), 345
Type Locality:Penrhyn castle, Bangor, North Wales, England, Great Britain
Comments:An ordered, mixed layer dioctahedral pyrophyllite-smectite

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