Formula: (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
Origin of name: for Kenzo Yagi (1949-), Professor of Geology, Hokkaido University (Japan).
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 10.09, c = 14.29
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Massive
Hardness: 5-6
Specific gravity: 2.70
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: from a meteorite
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