Tengchongite

tengchongite

studtite

calcurmolite

migmatite

Images

Formula: Ca(UO2)6(MoO4)2O5.12H2O
Hydrated molybdate
Specific gravity: 4.25
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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