Planet Granite is a location that appears in the Sonic the Comic series published by Fleetway Editions. It is a planet a million light-years from Mobius. It was the first planet that Amy Rose and Tekno the Canary were sent by the Ring of Eternity.
When Amy and Tekno arrived on Planet Granite, it was the dawn of a prehistoric civilisation. Two rival tribes were the weak, cowardly Meek Tribe and the strong, warlike Thickskull Tribe. The Thickskull Tribe frequently enjoyed attacking their Meek neighbours. Amy and Tekno helped fight off the Thickskulls once, but rather than give the Meeks weapons to defend themselves, instead they taught the Meeks to mock the Thickskulls so that they could convince the Thickskulls to discuss their problems around a table instead of fighting. This worked, leading the two tribes to sit down to discuss the cause of the Thickskulls' anger, and Tekno hoped that they might develop into a non-violent culture. Amy was glad that they had prevented war, but disheartened that they had invented cucumber sandwiches instead.