Uploaded January 2026 | Updated September 2026, 3 weeks ago

---

Phyllite is a beautiful metamorphic rock that starts out as soft mud and clay on an ancient seafloor. In this Short, we follow that quiet journey from shale to phyllite as heat and pressure slowly rearrange tiny clay minerals into fine mica and chlorite.

That silky sheen you see on phyllite isn’t just pretty—it’s a record of mountain-building and a very long, very patient process inside the Earth. If you love gentle, educational geology content like this, you’re in the right place.

Subscribe to Will O’s Southwest Studio for more calm rock and mineral stories, field guides, and geology adventures.