Formula: (Fe,Mn,Ca)3(PO4)2
Origin of name: Locality; Grafton, New Hampshire
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pink to brown, reddish brown
Diaphaneity: Translucent
Luster: Vitreous to resinous
Habit: Massive, cleavable; composite crystals, rough
Hardness: 5
Specific gravity: 3.67 to 3.79
Cleavage: 2; {010} distinct, {100} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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