Formula: CaV6O16 . 3H2O
Origin of name: From Greek meta and hewettite (two are dimorphous)
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.15 Å, b = 3.61 Å, c = 18.44 Å, β = 118.0°
Colour: Deep red
Diaphaneity:
Luster: Dull to silky
Habit: Crystals lath-like; fibrous coatings; nodular aggregates
Hardness:
Specific gravity: 2.94
Cleavage: None
Tenacity:
Streak: Maroon to brownish red
Synonyms/varieties:
Comments:
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