Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:NONTRONITE
Formula:Na0.3Fe3+2(Si,Al)4O10(OH)2 · nH2O
Crystal System:Monoclinic
Strunz Nr:8/H.19-40
Group:Smectite Group
References:AM 60 (1975), 840; HB2/2 (1995)
Type Locality:Saint-Pardoux, Nontron, Dordogne, France

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