Mexico Iceland spar, produced in Nuevo Leon, Mexico . 3.3 x 2.4 x 1.3 cm. Iceland spar in the region has a special fluorescence and phosphorescence (Fluorescent & Phosphorescent). Phosphorescence is that when ultraviolet light source is turned off, a mineral still continued fluorescence phenomena over time. Piece of Iceland spar was very shallow pink, cleavage since a much larger Iceland spar, which can be issued under shortwave ultraviolet light blue-violet fluorescence (obviously), can be issued under the long-wave ultraviolet fluorescent pink (obviously). After the short-wave ultraviolet light turned off, the blue-violet fluorescence can last several seconds.

Fluorescent minerals: calcite (Iceland spar), blue-violet fluorescence (shortwave), pink fluorescence (longwave), fluorescence obvious.