VS
Name
—
Na₆(Si₃₀Al₆)O₇₂·20H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
3.5–4
Mohs hardness
—
2.16
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
{010}, perfect
Cleavage
—
C2/m
Space group
—
Heulandite
Structural group
—
Cpt-Na · Approved
IMA
—
1969
Named in
—
Colorless to white; colorless in thin section
Typical colors
—
Na · Si · Al · O · H
Elements
—