Formula: Ca Fe Fe (PO4)2 (OH)
Origin of name: For Joseph Melon, Belgian mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Dark green, nearly black
Diaphaneity:
Luster: Brilliant, somewhat resinous
Habit: Massive, fibrous
Hardness: ~ 5
Specific gravity: 3.65
Cleavage: 2; {110} perfect, {010} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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