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Formula: U(UO2)3(PO4)2(OH)6.2H2O
Hydrated uranyl phosphate
Crystal System: Orthorhombic
Specific gravity: 4.49 calculated
Streak: Very pale yellow
Colour: Medium yellow, canary-yellow
Luminescence: Metavanmeersscheite from Kobokobo fluoresces bright green to yellow green in short wave and long
wave UV
Strongly RADIOACTIVE
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, the Kobokobo pegmatite, Mwenga Territory, South Kivu, DR Congo, metavanmeersscheite is a
rare secondary mineral in the
uraniferous zone of the altered
granite
pegmatite, formed by dehydration of
vanmeersscheite. Associated minerals include
vanmeersscheite and studtite
(HOM).
At Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, metavanmeersscheite occurs with
uraninite, and sometimes
torbernite, as lustrous, transparent, yellow to yellow-green, square to
rectangular tablets and elongated, stacked fans up to about 0.2 mm in size. It fluoresces bright green under short wave
and long wave UV
(MinRec 55.5.600-601).
Metavanmeersscheite from Johanngeorgenstadt -
Image
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