Formula: Na6(Fe,Mn)Al4Si8O26
Origin of name: after locality Naujakasik, Greenland
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: gray to silver-white
Diaphaneity:
Luster: pearly on basal plane
Habit: crystals platy, 1 to 5 mm across
Hardness: 2 to 3
Specific gravity: 2.62
Cleavage: 3; {001} micaceous, {-401} and {010} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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