Formula: Th(SiO4)1-x(OH)4x
Origin of name: from thorium and Latin for gum
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 7.068, c = 6.26
Colour: Yellowish brown, greenish gray, buff to nearly white
Diaphaneity: Opaque
Luster: Dull to subvitreous
Habit: crusts, opaline to microcrystalline, nodular masses, firm to earthy; fine-grained aggregates pseudemorphous of thorite
Hardness: 4.5 to 5.5
Specific gravity: 3.2 to 5.4
Cleavage: none
Tenacity:
Streak: brownish
Synonyms/varieties: Hydrothorite, Mackintoshite
Comments:
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