VS
Name
—
K₃Na(SO₄)₂
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Hexagonal
Crystal system
—
3
Mohs hardness
—
2.66–2.71
Specific gravity
—
—
Streak
—
Vitreous to resinous
Luster
—
On {1010}, fair; on {0001}, poor
Cleavage
—
P-3m1
Space group
—
Aphthitalite
Structural group
—
Att · Grandfathered
IMA
—
1813
Named in
—
White, colorless; gray, blue, green due to inclusions and impurities; colorless in transmitted light
Typical colors
—
K · Na · S · O
Elements
—