Isidrite

No! This is my lump of caramel!

Isidrite is a naturally occurring mineral which can be used in the repair of Transformer weaponry.

Fiction

The Transformers cartoon

While Ultra Magnus was leading a group of Autobots in mining a deposit of isidrite on an asteroid, they came under attack by the Decepticons, who needed the mineral in order to repair their weapons. Fortunately the disarray of the Decepticon attack, caused by Galvatron's unstable mental condition, made their job of repelling the attackers much easier, and the Autobots were able to get away with the isidrite. Webworld