VS
Name
—
Ca₆Al₂(SO₄)₃(OH)₁₂·27H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Hexagonal
Crystal system
—
2–2.5
Mohs hardness
—
1.77
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
On {1010}, perfect
Cleavage
—
P31c
Space group
—
Ettringite
Structural group
—
Ett · Approved
IMA
—
1874
Named in
—
Colorless, pale yellow, milky white; colorless in transmitted light
Typical colors
—
Ca · Al · S · O · H
Elements
—