Formula: Ca4(Mg,Fe,Mn)5(PO4)6
Origin of name: for Stanley Field, American museum official
Crystal system: monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: reddish to amber
Diaphaneity:
Luster:
Habit: massive, irregular grains, thin veinlets
Hardness: 4 to 5
Specific gravity: 3.15
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: from meteorites
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