Sodalite (Hackmanite)

About Sodalite (Hackmanite)

Exhibits tenebrescence - it changes color when exposed to UV light, turning from pale to vivid pink or purple, then fading back to white in darkness. This reversible photochromic effect is unique among gemstones. It was first discovered in Greenland in 1896. Afghanistan and Myanmar produce gem-quality material. The effect can be repeated indefinitely. Some specimens also fluoresce orange under UV light. It is one of the few minerals that changes color without any chemical alteration. The mechanism involves electrons moving between energy states. Specimens showing strong tenebrescence are the most valued.