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Mineralpedia Details for Afghanite

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Afghanite

Afghanite

Named after the country in which it was discovered, Afghanistan, where it can be found at the type locality in Ladjuar Medam in the Badakhshan Province. Additional localities for Afghanite are located in Russia, Tajikistan, Italy, the United States, and Canada, among only a couple others. Afghanite occurs at the type locality in veinlets cutting lazurite, and in Italy in siliceous limestone xenoliths in pumice.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/afghanite.pdf

Formula
Na22Ca10(Si24Al24)O96(SO4)6Cl6 
Crystal System
Hexagonal 
Crystal Habit
Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue, colorless 
Streak
white 
Class
Hexagonal 
Fracture
Conchoidal 
Hardness
5.5-6 
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Afghanite from Kokcha Valley, Badakshan, Afghanistan

Afghanite
            from Kokcha Valley, Badakshan,  Afghanistan

A gem quality, blue-green, 1.4cm prismatic crystal with multiple faces. 

Crude crystal grains to 4mm in matrix. 

A perfectly formed, translucent, gemmy, blue Afghanite crystal to 1cm partially set in Calcite matrix. This crystal has very well defined faces and a perfect terminated end exposed that shows the hexagonal outline.

Click thumbnail images for larger view.

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