VS
Name
—
Mg₂Al₄Si₅O₁₈
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
7–7.5
Mohs hardness
—
2.6–2.66
Specific gravity
—
white
Streak
—
Vitreous
Luster
—
Fair on {100}, poor on {001} and {010}
Cleavage
—
Cccm
Space group
—
Beryl
Structural group
—
Crd · Grandfathered
IMA
—
1813
Named in
—
Blue, Gray, Brown, Purple
Typical colors
—
Mg · Al · Si · O
Elements
—