Sodalite column (8-30 kilos), originating from Bolivia.

The mineral sodalite is a chlorine-containing sodium-aluminium-silicate with the chemical formula Na₈Al₆Si₆O₂₄Cl₂.. The tectosilicate belongs to the feldspar substitutes. The white, grey, pink, green or azure blue sodalite has a glassy to greasy lustre, a white streak colour and poor cleavage along the crystal plane [110]. The average density is 2.29, and the hardness is 6. The crystal system is cubic, and the mineral is not radioactive. The chemical composition of the mineral sodalite gives rise to its name; the English word sodium signifies "sodium". Sodalite occurs mainly in nepheline syenites, phonolites, and other felsic, silica-poor, igneous, and metamorphic rocks. The type locality is located in the Ilimaussaq massif in Greenland.