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Afghanite, (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3·0.5H2O, is a hydrous sodiumcalciumpotassiumsulfatechloridecarbonate alumino-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. It forms blue to colorless, typically massive crystals in the hexagonal crystal system. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. It has refractive index values of nω=1.523 and nε=1.529. It has one direction of perfect cleavage and exhibits conchoidal fracture. It fluoresces a bright orange.

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
Generally associated with sodalite-group minerals.
 IMA Status:
Approved IMA 1968
TL: Sar-e-Sang luzurite deposit in Afghanistan.
 Name Origin:
From its locality.
Physical Properties:
[???] Perfect
blue or colorless.
2.55 - 2.65, Average = 2.59
Massive - Uniformly indistinguishable crystals forming large masses., ,
5-6 - Between Apatite and Orthoclase
Vitreous (Glassy)
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