Owl - coll. P.P. ATHENA

MINERALOGY
mlevy
Mineral:BANNISTERITE
Formula:KCa(Mn,Fe2+,Zn)21(Si,Al)32O76(OH)16 · 12H2O
Crystal System:Monoclinic
Strunz Nr:8/H.17-10
Group:Smectite Group
References:NJMA 164 (1992), 169; HB2/1 (1995)
Type Locality:Benallt mine, Rhiw, Lleyn Peninsula, Caernavonshire (Gwynedd), Wales, GB

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