Was the home planet of the raxacoricofallapatorians,the planet was located in the Isop galaxy(a galaxy of great age).Raxacoricofallapatorius appeared in the doctor who series,the planet was purple and contained calcium based animals,the planet also had calcium based plants.
Raxacoricofallapatorius 1

An image of raxacoricofallapatorius

the planet had a twin planet.