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

Smectite, phyllosilicate mineral

Properties

Chemical formula

(Na,Ca)₀.₃₃(Al,Mg)₂(Si₄O₁₀)(OH)₂ * nH₂O

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

1,3

Color

White

Luster

—

Streak

—

Density

1,8 g/cm³

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EC.40

Dana classification

71.3.1a.2

IMA status

Grandfathered mineral (G)

IMA symbol

Mnt

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata