Detailed sheet

afghanite

Named after the country where it has been discovered, Afghanistan. Often confused with lapis lazuli (lazurite), lazulite or sodalite.



CHEMICAL CHARACTERISTICS

(Na,Ca,K)8[(Si,Al)12O24)] (H2O) (SO4,Cl,CO3)3 

complex alumino silicate



PHYSICAL CHARACTERISTICS

Main color

blue

only in blue shades

Color of streak

white

Luster

vitreous

Hardness

5.5 to 6.0

Density

2.55 to 2.65

Cleavage

perfect

Fracture

uneven



OPTICAL PROPERTIES

Transparency

transparent

Refractive index

1.530 - 0.000

Double refraction

0.006

very weak, uniaxial (+)

visible double refraction

No

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

short prisms often biterminated

crystals system

hexagonal



OTHER INFORMATIONS

Exploited
sites

Found in Afghanistan in the Koksha valley in Badakhshan, but also in Canada in the Baffin island, in Germany (Palatinat), in Italy, in Pamir massif in Tadjikistan.

use in jewelry

gemstone for collectors.

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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