Cyclosilicate mineral

Properties

Chemical formula

K(☐,Na)₂(Mn,Fe,Mg)₂[(Be,Al)₃Si₁₂]O₃₀

Group

Silicates

Crystal system

Hexagonal

Hardness (Mohs)

6

Color

Yellow

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.CM.05

Dana classification

—

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Alr

Locality

🇩🇪 Caspar quarry

Type locality

—

Discovery year

—

Source: Wikidata