Formula: Na₄(Si₃Al₃)O₁₂Cl

Species: Silicates – (Tectosilicates)

Colour: All Colours

Lustre: Vitreous, Greasy

Hardness: 5½ – 6

Specific Gravity: 2.27 – 2.33

Crystal System: Isometric

Member of: Sodalite Group > Feldspathoid Group

Name: The name reflects its sodium content.

Type Locality: Ilímaussaq complex, Kujalleq – Greenland