Claudia is a fluorescent blue ore mined on the floating world of Prester.
Several million Claudia
Claudia is the primary currency of Prester, and well suited for the purpose; as it is constantly burned in Claudia engines it is not subject to monetary inflation and cannot be counterfeited. A frugal person will spend less than 80 Claudia on room and board in a week. It is also potent—in its refined state, several billion Claudia is only a fist-sized stone.
Additionally,
Claudia fuel in a Vanship
it is processed into Claudia fuel, allowing ships to fly, by dissolving small amounts of it in water - the more that is dissolved, the more potent the fuel.