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Formula: Ca(U6+O2)2Si6O15.nH2O
Nesosilicate (insular SiO4 groups), uranyl mineral
Crystal System: Monoclinic
Specific gravity: 3.35 measured
Hardness: 3½
Colour: Pale yellow to greenish yellow
Luminescence: Fluoresces weak dull green under UV
Very strongly RADIOACTIVE
Environments
Localities
At the type locality, an unnamed uranium occurrence at Inyo County, California, USA, metahaiweeite occurs on
fracture surfaces in granite, associated with
haiweeite
(Mindat).
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