Ca-amphibole, double chain inosilicate mineral

Properties

Chemical formula

KCa₂(Mg₄Al)(Si₆Al₂)O₂₂Cl₂

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

—

Color

Black

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

C2/m

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.DE.10

Dana classification

—

IMA status

Redefined mineral (Rd)

IMA symbol

Pcprg

Locality

🇷🇺 Elgoras mount, Sal’nye tundry

Type locality

—

Discovery year

—

Source: Wikidata