Formula: LiAlSi2O6
Origin of name: for Virgil Everett Barnes (1903-1998), professor of mineralogy, University of Texas, Austin, U.S.A.
Crystal system: Hexagonal
Crystal class: 622
Twinning:
Unit cell: a = 5.132, c = 5.454
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Rarely crystals hexagonal prisms with bipyramidal terminations, to 50 micron. As irregular rosette-shaped fibrous overgrowths on other minerals.
Hardness: 5.5 to 6
Specific gravity: 2.39 to 2.46
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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