Formula: NaAl(PO4)F
Origin of name: For Alfred Lacroix, French mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pale yellow to pale green, gray, colourless
Diaphaneity:
Luster: Vitreous to resinous
Habit: Fragmentary crystals
Hardness: 4.5
Specific gravity: 3.29
Cleavage: 2; {111} and {1-11} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Phosphate analogue of durangite
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