Formula: NaAl(AsO4)F
Origin of name: Locality; State of Durango, Mexico
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common in artificial crystals on {001}, penetration
Unit cell: a = 6.69 Å, b = 8.66 Å, c = 7.27 Å, b = 115.8°
Colour: Pale yellow, light to dark orange to orange-red, red
Diaphaneity: Translucent
Luster: Vitreous
Habit: Crystals oblique pyramidal or prismatic elongated
Hardness: 5.5
Specific gravity: 3.90
Cleavage: 1; {110} distinct
Tenacity: Uneven; brittle
Streak: Yellowish
Synonyms/varieties:
Comments:
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