Loading data...

Impressum Privacy Policy

© 2026 TerraCollect

0.2.41

Minerals - Afghanite | TerraCollect

Mineral - Afghanite

Afghanite(Na,K)₂₂Ca₁₀(Si₂₄Al₂₄O₉₆)(SO₄)₆Cl₆

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

(Na,K)₂₂Ca₁₀(Si₂₄Al₂₄O₉₆)(SO₄)₆Cl₆

Unit Cell

a=12.77 c=21.35 Z=3

Physical Properties

Hardness

5.5 - 6

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

bluecolorless

Birefringence

0.006

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

trigonal

Composition

Elements

Mass

SiO₂

30.80

Al₂O₃

25.00

CaO

16.50

Na₂O

12.60

K₂O

2.70

Cl

4.60

H₂O

0.70

Karten-Ebenen

Geologische KarteSatelliten Karte

Name and first record : Named after the type locality country. Discovered in Afghanistan in 1967.

Chemistry :

Synonyms :

Varieties :

Abbreviation : Afg

literature

Bariand, P., Cesbron, F., & Giraud, R. (1968). A new special mineral: the Afghanite de Sar-e-Sang, Badakhshan, Afghanistan. Comparison with les minéraux de groupe de la cancrinite. Bulletin de Minéralogie , 91 (1), 34-42.

Cleavage

Perfekt after (1010)

Fracture

conchoidal

Tenacity

Brittle

Point Group

ditrigonal-pyramidal - 3m

Space Group

P31c (159)

Habit

lath-shaped, prismatic, tabular

Formation

Formed by contact metasomatism in silicated limestones or marbles through the interaction with alkali-, chloride-, and sulfate-rich hydrothermal solutions

Paragenesis

Twinning

Rarity

Rather rare

Synonyms

Afghanite, Natrodavyne

CO₂

0.40

SO₃

8.50

Afghanistan (Bariand et al. 1968)

Groups and Members

Feldspathoid-Supergroup

Cancrinite-Group