urea or carbamide crystals in polarized light

agriculture background carbamide carbonyl carbonyldiamine chemical chemics chiral chirality color colorful crystal crystalline diamide diaminomethanal diaminomethanone esthetical experiment fertilizer laboratory light macro magic medical microcrystal microphoto microphotography microscope microscopic mystical nitrogen nutrient pattern polarisation polarization polarized psychedelic rainbowcolored science scientific shape spectral spectralcolored spectrum structure texture urea