Formula: KNa2(Fe,Mn,Al)2Li3Si12O30
Origin of name: for K. Sugi, Japanese petrologist
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: light brownish yellow
Diaphaneity:
Luster: vitreous
Habit: subhedral grains, in aggregates
Hardness: 6 to 6.5
Specific gravity: 2.74
Cleavage: 1; {0001} poor
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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