Clay

Clay was a mineral substance which could be moulded.

According to Romana II, limestone and clay was combined with water to form cement. (TV: Destiny of the Daleks)

In 1918, Charles Banham, under the control of the Dark Forces, animated clay to form walking "corpses" which he unleashed in Yorkshire. (PROSE: Casualties of War) Containers of clay and pumice were present in a storeroom within which the Ninth Doctor and Rose Tyler were trapped after escaping the patients infected (TV: The Doctor Dances) with the "Empty Child Syndrome". (PROSE: Amarillo Hoax, Hitler's Last Secret?)

Mehendri Solon had a clay bust of Morbius. (TV: The Brain of Morbius)

The Seventh Doctor said that when he felt depressed, he would make clay models of Zygons to cheer himself up. (PROSE: Human Nature)

Golems were usually made out of clay. (AUDIO: The Beast of Orlok)