Marlion was a planet famous for its crystal mines.

Iris Wildthyme and Jenny Winterleaf once helped the Second Doctor defeat the Dalek Supreme in the crystal mines of Marlion. (PROSE: Bafflement and Devotion)

Huxley claimed that Jo Grant encountered Daleks on Marlion during her travels with Iris Wildthyme. (AUDIO: Find and Replace)

The Diamond Mines of Marion were a location in Reginald Tyler's The True History of Planets. (PROSE: Mad Dogs and Englishmen)

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