A mineral, V6 O13 .8H2 O(?) ; a mixed-valence
oxide; weakly radioactive; black; in the Colorado Plateau area as a sandstone
cement; also a massive wood replacement associated with carnotite, gypsum,
hewettite, pintadoite, tyuyamunite, and pyrite. See also:
kentsmithite
Source:
Dictionary of Mining, Mineral, and Related Terms