Formula: Na2Ti2Si2O9
Origin of name: For J. Lorenzen, Danish mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.49 Å, b = 8.699 Å, b = 5.233Å
Colour: Brown to black, light blue, green, white, colourless
Diaphaneity:
Luster: Vitreous, adamantine to
Habit: Crystals acicular, minute
Hardness: 6
Specific gravity: 3.43
Cleavage: 1; {010} distinct
Tenacity:
Streak:
Synonyms/varieties: Ramsayite
Comments:
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