Formula: LiAl2Al6(BO3)3Si6O18(OH)4
Origin of name: Named after George R. Rossman (1945-), California Institute of Technology, Pasadena, CA, USA, in recognition for his work on the spectroscopy of the tourmaline minerals.
Crystal system: Trigonal
Crystal class: 3 m
Twinning:
Unit cell: a = 15.77, c = 7.085
Colour: Pink, pale pink
Diaphaneity: Transparent
Luster: Vitreous
Habit: Columnar, striated
Hardness: 7
Specific gravity: 3
Cleavage: None
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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