Formula: Ca5(AsO4)3F
Origin of name: for Anton Svab, Swedish mining official
Crystal system: hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.80 Å, c = 6.97 Å
Colour: colouless, yellowish white to gray, grayish green
Diaphaneity:
Luster: vitreous to resinous
Habit: crystals short prismatic, massive
Hardness: 4 to 5
Specific gravity: 3.5 to 3.8
Cleavage: 1; {10-10} distinct
Tenacity: brittle
Streak:
Synonyms/varieties:
Comments:
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