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Afghanite

>> Group(s) : pyroxenes
See the pictures :

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

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.

See pictures of the mines / other pictures

Use in jewelry

gemstone for collectors.

Looking alike stones

azurite , dumortierite , lapis lazuli , lazulite , 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

Double refraction : 0.006

Very weak, uniaxial (+)

visible double refraction : no

Pleochroism : absent

Number of colors : 1

Fluorescence : none

Crystals

Short prisms often biterminated

cristaux

Crystal system : hexagonal

Other informations
For sale in our boutiques
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