Photo: Didier Descouens · CC BY-SA 4.0

True mica, phyllosilicate mineral

Properties

Chemical formula

KMg₃(Si₃Al)O₁₀(OH)₂

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

2,5

Color

Brown

Luster

—

Streak

White

Density

2,815 g/cm³

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

C2/m

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EC.20

Dana classification

—

IMA status

Grandfathered mineral (G)

IMA symbol

Phl

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata