Crystals obtained from the drying of urea in a sodium hydroxide (NaOH) solution. Sample sintetized by Angelo Pommella and Stefano Aime. A special thanks goes to Christophe Blanc for the set-up and to Adrian Philippe for the support.
Technique: Polarized light
Magnification: 10x
Microscope: Leitz Laborlux 12 Pol S
Camera: Nikon D50