Formula: (Mn,Fe)16Si12As3O36(OH)17
Origin of name: for Joseph Nelen, American chemist
Crystal system: hexagonal
Crystal class: 2/m
Twinning:
Unit cell:
Colour: brown
Diaphaneity:
Luster: vitreous
Habit: coarse granular, massive
Hardness: 5
Specific gravity: 3.46
Cleavage: 1; {0001} perfect
Tenacity:
Streak: light brown
Synonyms/varieties:
Comments: dimorphous with schallerite
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