Sodalite from Bolivia, flat stone

The mineral sodalite is a chlorine-containing sodium aluminum silicate with the chemical formula Na8Al6Si6O24Cl2. It belongs to the feldspathoids tectosilicaat. The white, gray, pink, green or deep blue sodalite is a glass to oily shine, a white stripe color and cleavage is poor according to the crystal surface [110]. The average density is 2.29 and the hardness is 6. The crystal system is cubic and the mineral is not radioactive. The name of the mineral sodalite is derived from the chemical composition; English sodium means "sodium." Sodalite is mainly found in nepheline syenieten, phonolite and other felsic silica-poor igneous and metamorphic rocks. The type locality is situated in the Ilimaussaq massif on Greenland.