Formula: CaFeV4W8O36.12H2O
Origin of name: after locality Rankach valley, Germany
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: dark brown to brownish yellow
Diaphaneity: opaque to slightly translucent
Luster: resinous to subadamantine
Habit: crystals acicular radiated and rosette-like aggregates and crusts
Hardness: 2.5
Specific gravity: 4.03
Cleavage: 2; {100} and {010} perfect
Tenacity:
Streak: brownish
Synonyms/varieties:
Comments:
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