Formula: Ca(UO2)2V2O8 . 3H2O
Origin of name: From Greek for lower (hydration) and tyuyamunite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 10.54 Å, b = 8.49 Å, c = 17.0 Å
Colour: Canary-yellow to greenish yellow, dark green or yellow green
Diaphaneity:
Luster: Adamantine to waxy
Habit: Crystals lath-like or scales, tiny; compact to microcrystalline masses; pulverulent thin coatings
Hardness: ~ 2
Specific gravity: 3.8 to 3.9
Cleavage: 3; {001} perfect, {010} and {100} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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