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MINERALOGY

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Mineral: BRINROBERTSITE
Formula: Na0,3Al4(Si4O10)2(OH)4.3,5H2O
Crystal System: Monoclinic pseudo Hexagonal
IMA Number: 1997-040
References: MM 66 (2002), 605; MR 4 (2004), 345
Type Locality: Penrhyn castle, Bangor, North Wales, England, United Kingdom
Comments: An ordered, mixed layer dioctahedral pyrophyllite-smectite

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