VS
Name
—
CaAl₁₂O₁₉
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Hexagonal
Crystal system
—
7.5–8
Mohs hardness
—
3.84
Specific gravity
—
Brown
Streak
—
Vitreous
Luster
—
{0001}, good; parting on {1010}
Cleavage
—
P6_3/mmc
Space group
—
Magnetoplumbite
Structural group
—
Hbn · Approved
IMA
—
1956
Named in
—
Brownish black to black; reddish brown in thin fragments; blue in meteorites
Typical colors
—
Ca · Al · O
Elements
—