VS
Name
—
Sb⁵⁺₃Mn³⁺₉Mn²⁺₃₅(BO₃)₁₆O₃₂
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Orthorhombic
Crystal system
—
6
Mohs hardness
—
4.7
Specific gravity
—
Brown
Streak
—
Metallic to submetallic
Luster
—
On {001}, perfect; on {100}, imperfect, a parting
Cleavage
—
Pnnm
Space group
—
—
Structural group
—
Bla · Approved
IMA
—
1984
Named in
—
Black; exhibits red-orange internal reflections
Typical colors
—
Sb · Mn · B · O
Elements
—