Earth Manipulation – The character can control earth, sand, stone, rock, lava, dirt, and/or other minerals.
Petra (Marvel) is a mutant with the ability to turn coal into diamonds (X-Men-Deadly Genesis #4)!
Terra (DC) is a superhero turned villain who had this power (New Teen Titans #28).
The Invincible universe has Titan (Image) in The Official Handbook of the Invincible Universe #2.
Dust Wight – D&D 3.5 – Monster Manual III
Maeder Medusa – TSR 2140A Monstrous Manual
Next 154) Earth Mimicry