Photo: John Krygier · Public domain

Phyllosilicate mineral

Properties

Chemical formula

Al₂Si₄O₁₀(OH)₂

Group

Silicates

Crystal system

Triclinic

Hardness (Mohs)

—

Color

Brown

Luster

—

Streak

White

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EC.10

Dana classification

71.2.1.1

IMA status

Grandfathered mineral (G)

IMA symbol

Prl

Locality

🇷🇺 Beryozovskoye deposit

Type locality

—

Discovery year

—

Source: Wikidata