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Formula: Al3(UO2)4(PO4)4(OH)5.5H2O
Hydrated uranyl phosphate
Crystal System: Triclinic
Specific gravity: 3.7 measured, 3.68 calculated
Hardness: 2 to 3
Colour: Bright yellow, yellow-green
Luminescence: Type material was not fluorescent. Material from Rhyolite Ridge, Nevada is fluorescent bright green under
short wave UV.
RADIOACTIVE
Environments
Pegmatites
Sedimentary environments
Localities
At the type locality, the Kobokobo pegmatite, Mwenga Territory, South Kivu, DR Congo, triangulite occurs as bright yellow
aggregates of flat, triangular or
rhombohedral crystals with a maximum length of 0.2 mm in the quartz -
K-feldspar - columbite zone of the complex
pegmatite. Associated minerals include
beryl, meta-autunite,
phosphuranylite, ranunculite and
zircon
(Mindat).
Triangulite from the Kobokobo pegmatite -
Image
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