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Formula: Ca(U6+O2)2(Si5O12)(OH)2.6H2O
Nesosilicate (insular SiO4 groups), uranyl mineral
Crystal System: Orthorhombic
Specific gravity: 3.35 measured, 4.93 calculated
Hardness: 3½
Streak: White
Colour: Pale yellow, greenish-yellow
Luminescence: Weakly fluorescent dull green under UV
Environments
Plutonic igneous environments
Pegmatites
Haiweeite is a secondary oxidation product
(Webmin).
Localities
At the Pasel adit, Radhausberg, Kreuzkogel massif, Naßfeld valley, Bad Gastein, St. Johann im Pongau District, Salzburg,
Austria, haiweeite occurs in gneiss
(Dana).
Haiweeite from the Pasel adit - Image
At Perus, São Paulo, Brazil, haiweeite occurs along fractures in
tourmaline-bearing granite
and granite pegmatites, associated with
autunite, meta-autunite,
uranophane, uranophane-β,
phosphuranylite,
torbernite, metatorbernite,
chernikovite and uranian opal
(AM 54.966-968).
Haiweeite from Perus - Image
At the type locality, Haiwee reservoir, Inyo county, California, USA, haiweeite occurs on fracture surfaces in
granite and voids in lake-bed sediments
(AM 44.839-843).
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