Formula: (Ca,Sr)5(AsO4,PO4)3(OH)
Origin of name: For Lewis Fermor, Geological Survey of India
Crystal system: Hexagonal
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pale pinkish white
Diaphaneity: Translucent
Luster: Greasy
Habit: Massive, granular
Hardness: 5
Specific gravity: 3.52
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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