While each snowflake is distinct, they all have six-sided crystals as a common feature.
Water molecules are organized in layers of hexagonal rings inside an ice crystal. These layers are known as the crystal's basal planes, and the c-axis or optical axis of the crystal is the direction normal to the basal plane. It can look translucent or more or less opaque bluish-white depending on the presence of contaminants like dirt particles or air bubbles.
From Mercury, which is close to the Sun, to the Oort cloud objects, which are far from it, ice is abundant and naturally occurs throughout the Solar System. It can be found as interstellar ice outside the Solar System. It is prevalent as precipitation and deposition on Earth's surface, especially in the polar areas and above the snow. As such, it is essential to the planet's water cycle and climate. It comes down as snowflakes and hail, or forms glaciers and ice sheets from snow as frost, icicles, or ice spikes.
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