Formula: Ca4Si3O9(OH)2
Origin of name: For William Fredrick Foshag (1894-1956), mineralogist and former curator at U. S. National Museum.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.406, b = 3.661, c = 7.034, β = 107.07°
Colour: White
Diaphaneity: Translucent
Luster: Silky
Habit: Fibrous, compact
Hardness: 3
Specific gravity: 2.36
Cleavage: 1; {001} distinct
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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