Formula: Mg3(H2O)18[(UO2)4O3(SO4)2]2·10(H2O)
Origin of name: Named for the locality, La Creusaz U-prospect near Les Marecottes, Western Swiss Alps, Switzerland.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 10.815, b = 11.249, c = 13.851, α = 66.224°, β = 72.412°, γ = 69.95°
Colour: Yellow orange
Diaphaneity: Transparent
Luster: Vitreous
Habit: Triangular crystals, rosettes
Hardness: 3
Specific gravity: 4.03
Cleavage: {011} perfect
Tenacity: Very brittle
Streak: Colourless
Synonyms/varieties:
Comments:
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