VS
Name
—
Mg₂K(Be₂Al)Si₁₂O₃₀
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
6
Mohs hardness
—
2.67
Specific gravity
—
Light blue
Streak
—
Vitreous
Luster
—
Poor on {0001}
Cleavage
—
P6/mcc
Space group
—
Milarite
Structural group
—
Ltm · Approved
IMA
—
2019
Named in
—
Very strong dichroism: cobalt blue and green-yellow observed along [0001] and [1000], respectively
Typical colors
—
Mg · K · Be · Al · Si · O
Elements
—