Snowflakes are snow crystals form when tiny supercooled cloud droplets (about 10 μm in diameter) freeze. The individual ice crystals often have hexagonal symmetry. Although the ice is clear, scattering of light by the crystal facets and hollows/imperfections mean that the crystals often appear white in colour due to diffuse reflection of all spectrum of light by the small ice particles.
Click the figure below to see the interactive illustration of the Snowflakes: Hexagonal Symmetry.
See also:
Snowflakes: Hexagonal Symmetry
Golden Rectangles