Formula: Ca(UO2)2Si6O15 . 5H2O
Origin of name: Locality; near Haiwee Reservoir, California
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pale yellow to greenish yellow
Diaphaneity:
Luster: Pearly
Habit: Crystals acicular, microscopic; spherulitic aggregates; single grains, flake-like
Hardness: 3.5
Specific gravity: 3.35
Cleavage: 1; {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces weak dull green
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