Formula: Na(Zn,Mg)3H2(AsO4)3
Origin of name: for H. O'Daniel, German mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: pale violet
Diaphaneity:
Luster:
Habit:
Hardness: 3
Specific gravity: 4.49
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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