Yingjiangite

Formula: (K₂,Ca)(UO₂)₇(PO₄)₄(OH)₆.6H₂O

Origin of name: after locality Yingjiang County, Yunnan, China

Crystal system: Orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: a = 15.707, b = 17.424, c = 13.692

Colour: Golden yellow to yellow

Diaphaneity: Transparent to translucent

Luster: Subadamantine to resinous

Habit: grains 0.01 to 0.015 mm in compact aggregates

Hardness: 3 to 4

Specific gravity: 4.54

Cleavage: none

Tenacity: 

Streak: Yellow

Synonyms/varieties:

Comments: Fluoresces weak yellowish green in both SW- and LW-UV, radioactive