Tags: Chemical Substance, Mineral.
Afghanite (NaCaK)8[Al6Si6O24](SO4Cl2CO3)3·0.5H2O is a hydrous sodium calcium potassium sulfate chloride carbonate 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.
