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Formula: BiMo2O7(OH).2H2O
Oxide, bismuth- and molybdenum-
bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.82 calculated
Hardness: 3
Streak: White
Colour: Pale yellow
Luminescence: No fluorescence under UV
Environments
Plutonic igneous environments
Hydrothermal environments
Localities
At the type locality, Punta de Su Seinargiu, Sarroch, Metropolitan City of Cagliari, Sardinia, Italy,
sardignaite occurs as thin prismatic crystals up to 1 mm in length in
quartz veins within a granitic
rock. It is a secondary mineral formed in the oxidation zone
of a molybdenite-bismuthinite
deposit. Associated minerals include bismuthinite,
bismoclite, molybdenite,
ferrimolybdite, koechlinite,
wulfenite and gelosaite
(HOM).
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