12 sided snowflakes occur along with the normal 6-sided snowflakes but scientists don't yet know which weather conditions cause them to happen.
Here are just a few examples of twelve sided snowflake patterns. You can use the six sided snowflake instructions to make a 12 sided paper snowflake.
Print all paper snowflake patterns on regular or colored paper. Use sharp scissors. For intricate patterns use small cuticle scissors.
View two beautiful color photographs of 12 sided crystals.