Snowflakes

It's snowing!

Snowflakes are ususally six-sided hexagonal crystals.  Snowflakes that deveop at cooler temperatures produce snowflakes with sharper tips, whereas snowflakes that develop at warmer temperatures produce  smoother tips. Here is a chart showing how the shape of the snowflake depends on the temperature: 

• 32-25° F - Thin hexagonal plates
• 25-21° F - Needles
• 21-14° F - Hollow columns
• 14-10° F - Sector plates
• (hexagons with indentations)
• 10-3° F - Dendrites
• (lacy hexagonal shapes)

I highly recommend the book The Secret Life of Water by Masaru Emoto.