Formula: Zn5CaFe2(AsO4)6 . 14H2O
Origin of name: For Rolf Fahle, German mineral dealer
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Yellow to gray to green
Diaphaneity:
Luster: Silky or pearly
Habit: Bundles of fibrous crystals to >1 cm and minute fibrous aggregates or spherules
Hardness:
Specific gravity:
Cleavage: 1; Perfect, normal to fibers
Tenacity:
Streak:
Synonyms/varieties:
Comments: Readily soluble in cold acid
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