Tourmaline mineral

Properties

Chemical formula

CaFe²⁺₃Al₆(Si₅AlO₁₈)(BO₃)₃(OH)₃(OH)

Group

Oxides

Crystal system

Trigonal

Hardness (Mohs)

—

Color

Brown

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

R3m

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

—

Dana classification

—

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Adc

Locality

🇯🇵 Saiki

Type locality

—

Discovery year

—

Source: Wikidata