Photo: John Sobolewski (JSS) · CC BY 3.0

Smectite, phyllosilicate mineral

Properties

Chemical formula

(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ * nH₂O

Group

Silicates

Crystal system

—

Hardness (Mohs)

—

Color

Brown

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EG.75

Dana classification

—

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Ban

Locality

🇺🇸 Franklin

Type locality

—

Discovery year

—

Source: Wikidata