Ice is a mineral! It's molecular lattice composed of hydrogen and oxygen repeats in all directions. Here, take a slow zoom through the center of hundreds of snowflakes, each one unique. The shape of every snowflake displays its utmost internal organization. Its hexagonal symmetry begins at the molecular level, 10 million times smaller than the self-organized product. This mirrored symmetry has to do with the structure of the water molecule itself: H20. Oxygen is heavier than Hydrogen, which makes water molecules join together the same way every time, building hexagons out of every six individual molecules.
Photographs courtesy of Professor Kenneth Libbrecht at the California Institute of Technology.