Formula: Si3N4
Origin of name: for Alfred Nier, American chemist
Crystal system: hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster:
Habit: 0.4 by 2 micron laths
Hardness:
Specific gravity: 3.11
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: found in meteorites
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