VS
Name
—
Ca₄(Mg₂Fe³⁺₁₀)O₄(Fe³⁺₁₀Si₂)O₃₆
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
6
Mohs hardness
—
4.097
Specific gravity
—
—
Streak
—
Semi-metallic
Luster
—
None
Cleavage
—
P-1
Space group
—
Sapphirine
Structural group
—
Khe · Approved
IMA
—
2014
Named in
—
Black to dark brown on thin edges; gray in reflected light with weak brown internal reflections
Typical colors
—
Ca · Mg · Fe · O · Si
Elements
—