An orthorhombic mineral, Ca(UO2 )6 O4 (OH)6 .8H2 O , with barium and potassium substitution for calcium; amber-yellow; a radioactive product of uraninite and ianthinite alteration.
Source: Frondel, Judith Weiss and Michael Fleischer. 1955. Glossary of Uranium- and Thorium-Bearing Minerals, Third Edition. Washington DC: United States Government Printing Office
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