Formula: Ba(UO2)3(SeO3)2(OH)4 . 3H2O
Origin of name: For C. Guillemin, French mineralogist
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 7.29 Ǻ, b = 16.87 Ǻ, c = 7.07 Ǻ
Colour: Canary-yellow
Diaphaneity:
Luster:
Habit: Crystals tabular; masses, silky; coatings
Hardness:
Specific gravity: 4.88
Cleavage: 2; {100} perfect; {010} good
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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