Fluorescent halite from Bochnia salt mine, Poland NASA/ADS
The photoluminescence of selected halite crystals from Bochnia Salt Mine (Bochnia, Poland) were discovered in 2014. This is a result of contemporary precipitation from percolating waters. In most cases the fluorescence is observed in whole crystals or in zones of crystals. Only clear parts of transparent crystals are orangered fluorescent in short UV light (320 nm).