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Formula: (Ca1-xNax)2(UO2)3(MoO4)2(OH)6-x.nH2O
Hydrated molybdate
Crystal System: Monoclinic
Hardness: 2 to 3
Colour: Bright yellow
Luminescence: Strong yellowish green under UV
Very strongly RADIOACTIVE
Environments
Calcurmolite is commonly associated with umohoite and
uranophane
(Mindat).
At an unspecified locality calcurmolite is reported as honey-yellow prismatic crystals or massive platy aggregates.
It forms pseudomorphs after
uraninite and is associated with
uranophane, uranospinite,
halloysite, betpakdalite,
jarosite and ferrimolybdite in
the zone of oxidation of a
uranium-molybdenum ore deposit
(AM 49.1152).
Localities
At the type locality, the Sokh-Karasu area, Kapan, Syunik Province, Armenia, calcurmolite occurs as a
secondary mineral in the lower oxidised zone of
molybdenum-uranium deposits.
Associated minerals include uraninite,
uranophane, uranospinite,
halloysite, betpakdalite,
jarosite and ferrimolybdite
(HOM).
At the Uranium occurrence, Tongbiguan, Yingjiang County, Dehong, Yunnan, China, calcurmolite is associated with
yingjiangite, studtite,
tengchongite and
autunite
(HOM).
At Rabejac Est, Le Puech, Lodève, Hérault, Occitanie, France, calcurmolite is associated with
umohoite and uranophane
(HOM).
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