Snow Science Groups of Ice Crystal Classifications
There are 7 major groupings of snowflakes which branch off into 41 morphological types.
Morphology deals with the structure and form of animals and plants and means the study of structure or form.
A snowflake may change or morph into a variety of shapes depending upon the conditions outlined above.
Here are the basic groups of Snow Crystal Classifications
Sources: National Weather Service - National Snow and Ice Data Center - Snowcrystals.com (Kenneth Libbrecht's Most Excellent snow and ice crystal site)