Wild Clay

Scrape scrape scrape... clay comes off smooth and silky from the creek-bed.

Ta da! Lizard by Taliesin. This can't be fired. The clay would need to be carefully sieved first for that, and even then it would be iffy. But the hands-on process of harvesting, creating, drying, observing, and slowly allowing the creation to return to earth is hugely rewarding.