Photo: Wikimedia Commons · Public domain

Smectite, phyllosilicate mineral

Properties

Chemical formula

Mg₀.₇(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ * 8H₂O

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

1,3

Color

Colorless

Luster

—

Streak

—

Density

2,55 g/cm³

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EC.50

Dana classification

71.2.

IMA status

Grandfathered mineral (G)

IMA symbol

Vrm

Locality

🇺🇸 Millbury

Type locality

—

Discovery year

—

Source: Wikidata