Formula: Ca5(AsO3OH)2(AsO4)2 . 9H2O
Origin of name: For Giovanni Ferraris, Italian mineralogist
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster:
Habit:
Hardness:
Specific gravity: 2.63
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with guerinite
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