Formula: CaMg5(PO4)3(CO3)(OH)
Origin of name: For Heinrich Neumann, Norwegian mineralogist
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Pale blue-green
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 5
Specific gravity: 3.02
Cleavage: 1; {001} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Dissolves slowly with effervescence in cold dilute HCl
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