Formula: Na(Ca,Pb)(Ca,Mn)(Mn,Mg)2(AsO4)3
Origin of name: From Greek for nut-brown
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Yellowish brown to brown
Diaphaneity: Subtranslucent
Luster: Greasy
Habit: Massive; fine granular
Hardness: 4
Specific gravity: 4.29
Cleavage: 2; {110} and {010} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with arseniopleite
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