Formula: Na(Mg,Zn)3Cu(AsO4)3
Origin of name: For Johannes Hiller, German mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Violet
Diaphaneity: Transparent
Luster:
Habit: Thin platelets in radial aggregates
Hardness: 3
Specific gravity: 4.15
Cleavage: 3; {010} perfect, {100} and {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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