VS
Name
—
Ca₄[Fe²⁺₆Fe³⁺₆]O₄[Si₈Be₂Al₂O₃₆]
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5.5
Mohs hardness
—
3.85–3.88
Specific gravity
—
Dark green
Streak
—
Subadamantine to nonmetallic
Luster
—
Two good, intersecting at ~55°; a parting ? elongation
Cleavage
—
P-1
Space group
—
Sapphirine
Structural group
—
Htu · Approved
IMA
—
1990
Named in
—
Black
Typical colors
—
Ca · Fe · O · Si · Be · Al
Elements
—