Formula: Sb2O3
Origin of name: for B. Valentinus, German alchemist (16th century)
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 4.914 Å, b = 12.47 Å, c = 5.421 Å
Colour: Colourless, white, grayish, yellowish, brownish, reddish
Diaphaneity: Transparent to translucent
Luster: Adamantine, pearly on cleavage
Habit: Crystals prismatic or tabular, prisms rounded and striated, in aggregates, massive, granular, columnar or lamellar
Hardness: 2.5 to 3
Specific gravity: 5.6-5.8
Cleavage: 2; {110} perfect, {010} distinct
Tenacity: Brittle, uneven fracture
Streak: White
Synonyms/varieties: Exitéle, antimony bloom
Comments: dimorphous with senarmonite
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