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Formula: Ca(UO2)6(MoO4)2O5.12H2O
Hydrated molybdate
Crystal System: Orthorhombic
Specific gravity: 4.25 measured, 4.24 calculated
Hardness: 2 to 2½
Streak: Light yellow
Colour: Yellow
Solubility: Soluble in sulphuric and nitric acids, slowly soluble in 1% hydrochloric acid
RADIOACTIVE
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type locality, an unnamed U deposit, Tengchong County, Baoshan, Yunnan, China, tengchongite occurs in
the oxide zone of a uranium mineralisation on the contacts between
migmatite and a
migmatitic gneiss. It is
closely associated with studtite and
calcurmolite
(AM 73.195-196).
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