Small snowflake, around 2mm. It is slightly melted and definitely worse than perfect photo by Pam Eveleigh:
10 serial shots averaged to boost signal-to-noise ratio. Background: dark woolen fabric, natural light (gray clouded sky), external optics Helios 44M-5, march 2013, Moscow. Looks better in original resolution (1024 x 768 pixels).
Prints available at Artist website (mirrors at Pixels and FineArtAmerica).
This tiny and unusual crystal was chosen as cover for music disk "Asylum Benefits EP" by Laurent Memmi, a French drone / ambient music producer:
If you want to see more snowflakes, you can browse through all snowflake pictures.
Here you'll find snowflake photo wallpapers in numerous resolutions and screen proportions, up to Ultra HD 4K.
And here is article about snowflake macro photography.