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Formula: Na4(UO2)(CO3)3
Uranyl carbonate
Crystal System: Monoclinic
Specific gravity: 3.67 measured, 3.74 calculated
Streak: Light yellow
Colour: Pale yellow to beige
Luminescence: Weak yellow to yellow-green fluorescence in short wave and long wave UV
Solubility: Readily soluble with effervescence in diluted acids and even soluble in water with pH < 6.5 (slightly acid)
RADIOACTIVE
Environments
Čejkaite is a secondary mineral associated with
decomposed uraninite. It is formed in a relatively dry environment at pH 6.5
to 11.5 (non-acidic) (Webmin).
Localities
At the type locality, the Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech
Republic, čejkaite forms a thin earthy efflorescence over a calcite
vein
associated with disintegrated uraninite. The broad
secondary mineral association includes
andersonite,
schröckingerite, uraninite
and calcite
(AM 88.686-693, Mindat).
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