VS
Name
—
Al₂O₃
Formula
—
Variety
Entry type
—
Oxides & Hydroxides
Chemical class
—
Trigonal
Crystal system
—
9
Mohs hardness
—
3.95–4.1
Specific gravity
—
White
Streak
—
Vitreous, Subadamantine
Luster
—
None — parting on {0001} and {1011} from lamellar twinning
Cleavage
—
R-3c
Space group
—
—
Structural group
—
—
IMA
—
—
Named in
—
Blue, Yellow, Pink, Purple, Colorless, Green
Typical colors
—
—
Elements
—