Formula: (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8
Origin of name: abbreviation of National Institute of Metallurgy, South Africa
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: yellow-green
Diaphaneity:
Luster:
Habit: massive, minute veinlets
Hardness: 3
Specific gravity: 3.19
Cleavage: 1; {001} pronounced
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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