A good looking specimen of Hackmanite Fluorescent for sale. Not common with interesting colours under fluorescent UV lighting as the pics show. A rarer form of Sodalite for your mineral collection. It looks white without UV lighting. Fluorescent Long and Short wave, Short, Long wave and normal light pics shown. The orange pics are with UVA filter and pink are without filter.
10cm x 7.8cm x 5cm, 428g.
Sodium Aluminum Silicate Chloride.
Sodalite is a scarce mineral that can be rock forming. Named in reference to its sodium content. It is used for carvings and some jewelry pieces. Sodalite is a member of the feldspathoid group of minerals. Minerals whose chemistries are close to that of the alkali feldspars but are poor in silica (SiO2) content, are called feldspathoids. As a result or more correctly as a function of the fact, they are found in silica poor rocks containing other silica poor minerals and no quartz. If quartz were present when the melt was crystallizing, it would react with any feldspathoids and form a feldspar. Localities that have feldspathoids are few but some produce large quantities of sodalite. Sodalite, when not blue, is hard to distinguish from other feldspathoids. It is the only feldspathoid that contains chlorine. Sodalite dissolved in a dilute solution of HNO3 gives a positive chlorine test obtained from some swimming pool test kits.