Chemical Formula:

Mn²⁺Mn³⁺₂O₄

Mineral Class:

Oxide

Crystal System:

Tetragonal

Symmetry:

4/m 2/m 2/m

Hardness:

5-5.5

Specific Gravity:

4.7-4.8

Cleavage:

{001} perfect

Fracture:

Uneven

Color:

Gray, black

Streak:

Red-brown

Luster:

Submetallic

Transparency:

Opaque

Common Habits:

Massive

Other Properties:

Notable Localities:

Russia; Långban, Sweden; Ilfeld, Germany; Bulgaria

Uses:

Manganese ore, mineral specimen

Associated Minerals:

Garnet