18 Stages

Mighty snowflakes from tiny seed crystals grow.

 

In 58 minutes, this crystal grew from 0.05 to 3.0 mm (tip to tip). The images are all at the same scale. You might think #16 is scaled smaller than #18 (for example), but it is not. Note that the center hexagon is the same size in each image (although it also changes slightly as the crystal grows)

 

You can see more detail if you go large:

www.flickr.com/photos/klibbrecht/15347842773/sizes/k/

 

or really large:

www.flickr.com/photos/klibbrecht/15347842773/sizes/o/

(scroll down and to the right to see more than just white)

Done