Phi II also named simply Phi, is an ringed Class G planet located in the Phi system of the Orias sector. If features a surface covered in crystalline fragments of sulfite compounds. Its atmosphere is composed of a mix of carbon dioxide and hydrogen. While neutronium ore has been detected on the planet's western landmass, the severe conditions make establishing a manned mining outpost prohibitively expensive. When in 2409 traces of dilithium had been detected in the planets ring, The Federation considered establishing mining stations on some of the larger asteroids. So a Starfleet ship was sent to collect samples for SCE evaluation. The survey was interruped by the sudden presence of Jem'Hadar warships. (ST video game: Star Trek Online: Phi System Patrol)