Formula: V2O2(OH)3
Origin of name: For Gunnar Hagg (1903-), chemist and crystallographer, of the University of Uppsala, Sweden.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.17, b = 2.99, c = 4.83, β = 98.25°
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Efflorescences, botryoidal, disseminated
Hardness: 4.5
Specific gravity:
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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