VS
Name
—
[(Na,K)₆(SO₄)][Ca₂Cl₂][(Si₆Al₆O₂₄)]
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
6
Mohs hardness
—
2.42–2.53
Specific gravity
—
—
Streak
—
Silky to brilliant on {1010}, otherwise vitreous
Luster
—
{1010}, perfect; {0001}, less distinct
Cleavage
—
P6_3
Space group
—
Cancrinite, Cancrinite-sodalite
Structural group
—
Msm · Grandfathered
IMA
—
1872
Named in
—
Colorless
Typical colors
—
Na · K · S · O · Ca · Cl · Si · Al
Elements
—