Formula: CaV6O16 . 6H2O
Origin of name: For D. Hewett, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Deep red
Diaphaneity:
Luster: Dull to silky
Habit: Crystals lath-like; nodular aggregates and fibrous coatings
Hardness:
Specific gravity: 2.62
Cleavage: None
Tenacity:
Streak: Maroon to brownish red
Synonyms/varieties:
Comments:
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