Glowrocks is all about fluorescent minerals. 

Photographs and essays, along with links to related information, serve to provide you as the web's complete fluorescent mineral resource! 

The featured piece is a set of calcite items from Florida.

The front 2 pieces are crystals, while the back piece is calcite encrusting some marine fossils.  All have a very radiant glow.  (click to see a larger version)