Formula: Ba(UO2)3O3(OH)2.3H2O
Origin of name: for Jean Protas, French mineralogist
Crystal system: monoclinic, pseudohexagonal
Crystal class: m
Twinning:
Unit cell:
Colour: orange
Diaphaneity: transparent
Luster: subadamantine
Habit: pseudohexagonal platelets, 0.1 to 0.5 mm
Hardness:
Specific gravity: 5.83
Cleavage: 1; {010} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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