Bokite : (Al,Fe)1.3(V5+,V4+,Fe3+)8O20·7.5H2O
Corvusite : (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20·6-10H2O
Fervanite : Fe3+4V5+4O16·5H2O
Photo added to mindat.org
“1 mm size spherulite agregate of black tabular Bokite crystals partially replaced by yellow Fervanite. Associating mineral is black earthy Corvusite also partially replaced by Fervanite. FOV is ~5x4 mm. Pavel M. Kartashov collection and photo”
Pavel Kartashov - 14th August 2007
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