Formula: SeO2
Origin of name: For W. Downey, Pennsylvania
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Adamantine
Habit: Crystals acicular, prismatic
Hardness:
Specific gravity: 4.15
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Strongly hygroscopic
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