The straczekite group includes:
bariandite:
Al0.6(V5+,V4+)8O20.9H2O
bokite:
(Al,Fe)1.3(V5+,V4+,Fe3+)8O20.7.5H2O
corvusite:
(Na,Ca,K)1-x(V5+,V4+,Fe2+)8O20.4H2O
straczekite:
(Ca,K,Ba)(V5+,V4+)8O20.3H2O
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