Formula: (Na,Li)Al(PO4)(OH,F)
Origin of name: from natrium = sodium and montebrasite
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: grayish white to white
Diaphaneity: translucent
Luster: vitreous
Habit: crystals short prismatic, rough, massive
Hardness: 5.5 to 6
Specific gravity: 3.04 to 3.1
Cleavage: 4; {100} perfect, {110} good, {0-11} distinct, {001} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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