VS
Name
—
MgAl₃O₂(BO₃)(SiO₄)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
7.5
Mohs hardness
—
2.98–2.99
Specific gravity
—
white
Streak
—
Vitreous, somewhat pearly on the cleavage
Luster
—
{100}, more perfect, and {010}
Cleavage
—
Pbnm
Space group
—
—
Structural group
—
Gdd · Grandfathered
IMA
—
1902
Named in
—
Blue, Green
Typical colors
—
Mg · Al · O · B · Si
Elements
—