Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:TODOROKITE
Formula:(Mn2+,Ca,Mg)Mn4+3O7 · H2O
Crystal System:Monoclinic
Strunz Nr:4/D.09-10
Group:Coronadite Group
References:AM 68 (1983), 972; HB3 (1997)
Type Locality:Todoroki mine, Hokkaido, Japan

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