Analcime
Analcime or analcite is a white, grey, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Analcime can be found in Namibia.
Chemical Formular : Na(AlSi2O6) · H2O
Refractive Index : 1.479 – 1.493
Hardness : 5 – 5.5 on the Mohs Scale
Crystal System : Orthorhombic