Formula: (Ca,Mg)F(Cl,F)
Origin of name: from Latin for dew
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: tabular crystals to 1 mm
Hardness: 2
Specific gravity: 2.78
Cleavage: 2; {001} excellent, {110} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments: soluble in water, hygroscopic, in air becomes turbid (alters to fine-grained fluorite), fluoresces weak violet
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