Ragnium

Ragnium is a substance that appears in Sonic Boom: Fire & Ice. It is a new element discovered and harnessed by Dr. Eggman.

Description
Ragnium is a green, crystal like substance and supercharged form of natural element from the underground. The only known deposits of it are found on the mythical island of Ragna Rock. When melted down and combusted, it can be used as a powerful fuel source for robots. Ragnium serves as a collectible, similar to coins, that can be traded with Tails for Bot Racing robots.

Sonic Boom: Fire & Ice
Ragnium was first discovered by Dr. Eggman, who began mining it as a fuel source to empower his henchmen robots to the point that they could allegedly outrun Sonic. However, the doctor's operations created messy by-products that piped off to the adjacent islands, stirring up fire and ice elements that damaged the environment. To mine Ragnium, Eggman created D-Fekt, who failed to live up to its function.