Photo: Robert M. Lavinsky · CC BY-SA 3.0

Mixed oxide mineral of manganese II and III

Properties

Chemical formula

Mn²⁺Mn³⁺₂O₄

Group

Oxides

Crystal system

Tetragonal

Hardness (Mohs)

—

Color

Black

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

4.BB.10

Dana classification

—

IMA status

Grandfathered mineral (G)

IMA symbol

Hsm

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata