Quartz City

 was the capital city of Danpetro. It was named for the fact that it lay on a mountain of quartz.

Quartz City was located near the West Pole. It had the only spaceport on Danpetro.

When Bernice Summerfield was on Danpetro, it was attacked by an alien scout ship that drilled a hole into Quartz City. This killed all the people in and around the city. (PROSE: A Game of Soldiers)