Jim Solar Space Sheriff - Pirates of the Planet X #1

Jim Solar, Space Sheriff, investigates a rare mineral called Nixite on Planet X, where he discovers that pirates have stolen a cargo shipment of the valuable substance. Sheriff Solar is captured by the alien inhabitants of Planet X after they learn of the theft, but he reveals he witnessed the pirates' removal of the Nixite and helps expose their crime. The story involves space combat, antigravity magnets, and the recovery of the stolen mineral cargo.