Gaianium

Gaianium (地素 Chiso), abbreviated as Ga, is a chemical element. It is a rare metal, found in few places around the world. It is also highly concentrated in Devil Fruits, which gives it its horrible taste.

Etymology
Gaia (Γαῖα) is the personification of the Earth and a primordial deity in Greek mythology.


 * The symbol Ga is used for Gallium, an actual element.