Photo: Wikimedia Commons · Public domain

Oxide mineral

Properties

Chemical formula

Al₂O₃

Group

Oxides

Crystal system

Trigonal

Hardness (Mohs)

9

Color

Colorless

Luster

—

Streak

White

Density

—

Cleavage

—

Fracture

Conchoidal

Tenacity

—

Crystal habit

—

Transparency

—

Space group

R-3c

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

4.CB.05

Dana classification

4.3.1.1

IMA status

Grandfathered mineral (G)

IMA symbol

Crn

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata