Ivory

From Tardis Wiki, the free Doctor Who reference
Ivory

Ivory from Indonesia was an object in the game of Time-Space Scavenger Hunt played by the Twelfth Doctor and Miss Chief. (COMIC: Witch Hunt)

In 2595 ivory was vat-grown and used on floors in buildings on Mars. (PROSE: Beige Planet Mars [+]Loading...["Beige Planet Mars (novel)"])