Formula: Sb2O3
Origin of name: for H. de Senarmont, French mineralogist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 11.15 Å
Colour: colourless to grayish white
Diaphaneity:
Luster: resinous
Habit: crystals octahedral, to 3 cm, massive, granular, crusts
Hardness: 2 to 2.5
Specific gravity: 5.50
Cleavage: 1; {111} trace
Tenacity: uneven, brittle
Streak: white
Synonyms/varieties:
Comments: dimorphous with valentinite
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