Photo: Modris Baum · Public domain

Transitional structure between phyllosilicate and other silicate unit, mineral

Properties

Chemical formula

KNa₆Be₂(Si₁₅Al₃)O₃₉F₂

Group

Silicates

Crystal system

Trigonal

Hardness (Mohs)

—

Color

—

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

P-3m1

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.EH.25

Dana classification

76.2.11.3

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Eir

Locality

🇳🇴 Vesle Arøy island

Type locality

—

Discovery year

—

Source: Wikidata