Formula: (Mn,Fe)16Si12As3O36(OH)17
Origin of name: for W.Schaller, American mineralogist
Crystal system: hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: reddish brown
Diaphaneity:
Luster: waxy on fracture, pearly on cleavage
Habit: massive, granular
Hardness: about 5
Specific gravity: 3.365
Cleavage: 1; {0001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with nelenite
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