What would be the correct word? Specimen?

An ichnofossil is the fossil of activity of a living thing.

But specimen seems like it might work as long as you’re not using wet / embalmed with it.

Vitrification maybe almost works, but doesn’t seem to really work for a snowflake.

Aquastasis ? (Joking)

Apologies. After reading this I’m now wracking my brain trying to figure out what would be the correct word to apply to creating a /mold/ model / sample of a snowflake.