VS
Name
—
Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5.5
Mohs hardness
—
3.81
Specific gravity
—
Reddish brown
Streak
—
Vitreous to greasy
Luster
—
Good on {010}, {100}
Cleavage
—
P-1
Space group
—
Sapphirine
Structural group
—
Aen · Approved
IMA
—
1865
Named in
—
Velvet-black; in thin section, reddish brown to black
Typical colors
—
Na · Fe · Ti · O · Si
Elements
—