Photo: Andrew Silver, USGS · Public domain

Oxide mineral

Properties

Chemical formula

Cr₂O₃

Group

Oxides

Crystal system

Trigonal

Hardness (Mohs)

—

Color

Black

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

R-3c

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

4.CB.05

Dana classification

4.3.1.3

IMA status

Grandfathered mineral (G)

IMA symbol

Esk

Locality

🇫🇮 Outokumpu

Type locality

—

Discovery year

—

Source: Wikidata