Formula: Ca3(AsO4)2.11H2O
Origin of name: after locality Phaunoux, the French name for the valley
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster: vitreous
Habit: crystals acicular, to 1.5 mm, in fan-shaped groups
Hardness:
Specific gravity: 2.28
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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