Crystalline emiristol

Crystalline emiristol was a type of low-technology solid propellant used as a fuel.

The Kataan probe, launched from Kataan in the 14th century, used crystalline emiristol as a propellant. This left behind a radioactive trail that the USS Enterprise (NCC-1701-D) could trace back to its home star system in 2368, using a probe. 

Emiristolo cristallino