Photo: Wikimedia Commons · CC BY 2.0

Alunite supergroup, sulfate mineral

Properties

Chemical formula

KAl₃(SO₄)₂(OH)₆

Group

Sulfates

Crystal system

Trigonal

Hardness (Mohs)

—

Color

Yellow

Luster

—

Streak

White

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

R-3m

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

7.BC.10

Dana classification

30.2.4.1

IMA status

Redefined mineral (Rd)

IMA symbol

Alu

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata