Formula: Ca16(Mg,Li)2[B13O17(OH)12]4Cl6·28H2O
Origin of name: for Thomas Leonard Walker (1867-1942), Founding Member and past president Geological Society of America.
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 15.52, b = 22.74, c = 8.761
Colour: Colourless, white
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Fibrous, acicular
Hardness: 3
Specific gravity: 2.07
Cleavage: None
Tenacity: Brittle, splintery
Streak: White
Synonyms/varieties:
Comments:
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