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

Sulfate mineral

Properties

Chemical formula

K₃Na(SO₄)₂

Group

Sulfates

Crystal system

Trigonal

Hardness (Mohs)

3

Color

White

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

7.AC.35

Dana classification

28.2.2.1

IMA status

Grandfathered mineral (G)

IMA symbol

Att

Locality

🇮🇹 Mount Vesuvius

Type locality

—

Discovery year

—

Source: Wikidata