Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:CHROMDRAVITE
Formula:NaMg3(Cr,Fe3+)6(BO3)3Si6O18(OH)4
Crystal System:Rhomboedral (Trigonal)
Strunz Nr:8/E.19-30
Group:Tourmaline Group
References:ZVMO 112 (1983), 222; HB2/1 (1995)
Type Locality:Onega depression, Karelia, Russia, USSR

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