VS
Name
—
Ca₂(Si₄Al₄)O₁₅(OH)₂·4H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
4
Mohs hardness
—
2.39–2.45
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
{100}, {110}, distinct
Cleavage
—
C2/c
Space group
—
—
Structural group
—
Pth · Approved
IMA
—
1978
Named in
—
White, dark blue [sic]; in transmitted light, colorless
Typical colors
—
Ca · Si · Al · O · H
Elements
—