VS
Name
—
Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
7.5
Mohs hardness
—
3.4–3.58
Specific gravity
—
white
Streak
—
Vitreous
Luster
—
Fair on {010}, poor on {001}, {100}
Cleavage
—
P-1
Space group
—
Sapphirine
Structural group
—
Spr · Grandfathered
IMA
—
1819
Named in
—
Blue, Green
Typical colors
—
Mg · Al · O · Si
Elements
—