E-mail: osvald.petr@mineralos.cz
K(Fe,Mg)3AlSi3O10(OH,F)2
Foto - Osvald Petr
201, Biotit (Biotite), Tachov, Čechy (Bohemia) CZ,
55×30×40 mm, 2,0
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E-mail: osvald.petr@mineralos.cz