Ca-amphibole, double chain inosilicate mineral

Properties

Chemical formula

PbCa₂(Mg₃Fe³⁺₂)(Be₂Si₆)O₂₂(OH)₂

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

5,5

Color

Black

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

P2/a

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.DE.10

Dana classification

66.1.4.1

IMA status

Redefined mineral (Rd)

IMA symbol

Joe

Locality

🇸🇪 Långban

Type locality

—

Discovery year

—

Source: Wikidata