VS
Name
—
Ca₄[Mg₃Fe³⁺₉]O₄[Si₃Al₈Fe³⁺O₃₆]
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5
Mohs hardness
—
3.959
Specific gravity
—
Gray
Streak
—
Submetallic
Luster
—
Good on {010} and {001}
Cleavage
—
—
Space group
—
Sapphirine
Structural group
—
Dor · Approved
IMA
—
1987
Named in
—
Dark red-brown to dark brown
Typical colors
—
Ca · Mg · Fe · O · Si · Al
Elements
—