PYRA AND THE TEKTITES: THE UNICORN STONE by Tyree Campbell

Pyra continues to elude the pirates, but can she avoid being recaptured by Ichthia and sold to the highest bidder? Can Flanagan negotiate his way to freedom by delivering a Unicorn Stone to the Tektites? And what of the morrikaru, the creatures that live in the ocean under the surface of Europa?
 
Pyra acquires skills she could never learn in school—such as piloting a shuttle in space, and how to identify minerals. But these skills also get her into more trouble, such as when she accidentally steals the shuttle. Oops!