VS
Name
—
Ca₆Cr₂(SO₄)₃(OH)₁₂·26H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Hexagonal
Crystal system
—
2
Mohs hardness
—
2.025
Specific gravity
—
Very pale violet
Streak
—
Vitreous
Luster
—
{1010}, perfect; {0001}, distinct
Cleavage
—
P6_3/mmc
Space group
—
Ettringite
Structural group
—
Bto · Approved
IMA
—
1979
Named in
—
Bright violet
Typical colors
—
Ca · Cr · S · O · H
Elements
—