3-Sided, triangular shaped snow crystals can appear with the same weather conditions that produce 6 sided, hexagonal shaped snowflakes.
These 3-Sided, triangular snowflakes, like the 12 sided variety, are a mystery to science. Here is a close-up set of photographs showing three sided snowflakes.
Here's another three sided snowflake that is featured right here on this page! Can you find it? (hint look for #730)
Print these patterns on regular or colored paper. Use sharp scissors. For intricate patterns use small cuticle scissors.