Formula: Ca(UO2)6(MoO4)2O5.12H2O
Origin of name: after locality Tengchong County, Yunnan, China
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 15.616, b = 13.043, c = 17.716
Colour: Yellow
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: irregular tabular grains to micaceous
Hardness: 2 to 2.5
Specific gravity: 4.25
Cleavage: 1; {001} perfect
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments: Radioactive
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