Mooncrete

He gestured at the mooncrete. "Great stuff, huh? And another case of the Builders showing off. They not only make us a moon; they make us one that will remain forever new."

The driver slowed down to a crawl; the vehicle's inflated wheels bumped slightly as they moved onto a mooncrete ramp, then the bus began rolling downward toward a pair of double doors.

The design emphasized the use of extra-terrestrial materials preferably from the Moon. "Mooncrete" – or lunar concrete – should be produced by processing lunar rocks in a factory.

An otherworldly project is underway. A researcher at the University of Miami is currently making "mooncrete," a material he hopes to perfect for building a habitable base on the moon.