Photo: Val Collins · Public domain

Feldspar, tectosilicate mineral

Properties

Chemical formula

KAlSi₃O₈

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

6

Color

Colorless

Luster

—

Streak

White

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

C2/m

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.FA.30

Dana classification

76.1.1.2

IMA status

Grandfathered mineral (G)

IMA symbol

Sa

Locality

🇩🇪 Drachenfels

Type locality

—

Discovery year

—

Source: Wikidata