Formula: Ca3Si2O7 . 3H2O
Origin of name: For W. Foshag, American mineralogist, and the mineral centrallasite (now gyrolite)
Crystal system: Monoclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: White
Diaphaneity:
Luster:
Habit: Crystals tabular, elongated, striated vertically; in radial aggregates
Hardness: 2.5 to 3
Specific gravity: 2.5
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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