Water molecules bond at a tetrahedral angle of 109.5 degrees. That angle, repeated at the molecular level, is why every snowflake has six-fold symmetry. The hexagonal lattice structure of ice propagates outward as the crystal grows, with each arm following a closely similar thermodynamic path (small differences due to temperature and pressure over small distances).
It got very warm around here so I'm getting started on gardening. I stumble, literary, across these two geodes. Some of you may remember that I keep finding small geodes in my backyard... but this (one in the back in photo) may be the biggest one. My collection grows! #geode #rocks #minerals #crystals
