Celestite on aragonite
Blue-green celestine on aragonite. The celestine fluoresces a color that is hard to describe... somewhere between tan and grey. The aragonite glows brilliantly red. The photo is a stack of 20 HDR photos. Largest crystal is 3.5 cm.
Locality: Caltanisetta, Sicily, Italy.
Source: Fluorescent Minerals Workgroup MKA