Wilson A. “Snowflake” Bentley (1865–1931), born in Jericho, Vermont, USA, is the first known photographer of snowflakes. He perfected a process of catching flakes on black velvet in such a way that their images could be captured before they either melted or evaporated.
He photographed more than 5,000 “crystals” in his lifetime. His process was to capture them on a blackboard, and then shuffle them onto black velvet. You can see more of his collection here.