Rock, or stone, was a naturally occurring aggregate of minerals.
Petrification was the process in which organic matter was turned into stone. The hand of Eldrad was petrified (TV: The Hand of Fear) as were Mrs Pritchard and her daughter, Gwendoline, after Light made them so. (TV: Ghost Light)
The ancient Egyptians used rocks as weapons when the Daleks landed in Egypt in search of the taranium core for the Time Destructor. One Dalek was rendered immobile as rocks were piled around its base. (TV: The Daleks' Master Plan) The Red Dalek commanding the mission was killed after it was bombarded by rocks, losing its gunstick and sustaining critical damage to its casing before being buried. (PROSE: The Mutation of Time)
On the planet Nebulax 4, rocks could be squeezed to produce a variety of bodily fluids, such as blood, mucus, saliva, phlegm or vomit, thus rendering the phrase "you can't get blood out of a stone" void. (TV: The Bounty Hunter)