VS
Name
—
Mg(Fe³⁺,Al)O(BO₃)
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Orthorhombic
Crystal system
—
5–6
Mohs hardness
—
—
Specific gravity
—
Black
Streak
—
Submetallic to adamantine
Luster
—
Perfect on {100}
Cleavage
—
Pnma
Space group
—
Warwickite
Structural group
—
Yfl · Approved
IMA
—
1994
Named in
—
Black; brown in thin section; pale gray in reflected light, with dark red internal reflections
Typical colors
—
Mg · Fe · Al · O · B
Elements
—