Formula: K(UO2)2SO4(OH)3.H2O
Origin of name: for Franz Xaver Maxmillian Zippe (1791-1863), Austrian mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: common on {001}
Unit cell: a = 8.81 Å, b = 14.13 Å, c = 8.85 Å, b = 104.2°
Colour: Orange-yellow, golden yellow, orange-red, reddish brown
Diaphaneity: Transparent to translucent
Luster: Dull to earthy
Habit: Crystals twinned, compact aggregates, coatings
Hardness: 2
Specific gravity: 3.66
Cleavage: 1; {010} perfect (probable)
Tenacity:
Streak: Yellow white
Synonyms/varieties:
Comments: Fluorescent but widely variable and not dependable, SW-UV bright yellow, LW-UV bright yellow, radioactive
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