Sodalite,  New zealand.

Sodalite, New zealand.

Sodalite is named because of it's soda content. It is a tectosilicate mineral with the formula Na8 ( Al6 Si6 O24 ) Cl2 , and is classed as a feldspathoid mineral.  It has the appearance of a rock, but it is a mineral, and when polished can be used for making jewellery. Unfortunately, it's origin can only be loosely attributed to New Zealand.