Formula: NaMgF3
Origin of name: for F. Neighbor, American geologist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 5.363, b = 7.676, c = 5.503
Colour: colourless to pink
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals octahedral, twinned, to 0.1 to 0.5 mm, rounded grains
Hardness: 4.5
Specific gravity: 3.03
Cleavage: none
Tenacity: Uneven fracture, flat surfaces (not cleavage)
Streak: White
Synonyms/varieties:
Comments:
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