Formula: Al(UO2)2(PO4)2(OH).8H2O
Origin of name: for Ian Threadgold (1929-), Australian mineralogist, University of Sydney, NSW, Australia
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 20.25, b = 9.85, c = 19.75, β = 111.4°
Colour: greenish yellow
Diaphaneity: translucent
Luster:
Habit: crystals tabular, micaceous
Hardness: 2-3
Specific gravity: 3.4
Cleavage: none
Tenacity:
Streak: yellow white
Synonyms/varieties:
Comments: Fluorescent, SW-UV pale green, LW-UV green
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