Imori stone
From Tardis Wiki, the free Doctor Who reference
Imori stones were sacred stones unique to Koturia. The Koturian people used these stones in their marriage rituals to amplify the love of the bride and groom in order to complete Phasing, by providing energy to feed the acceleration of Koturian metabolism during Phasing. The largest Imori stone ever discovered on Koturia was placed in the Flamingo chapel, the most exclusive place on the Swathe, and only the most elite families were permitted to use it.
A similar stone was found on Azzarozia, which was used for rocket fuel. (PROSE: Something Borrowed)
