After a brief interval at Bratton Clovelly, in 1793
William and his family moved permanently to the rectory of Creed in Cornwall. Here he continued his remarkably accurate chemical analysis of minerals, most of which came from Cornwall, such as the zeolites found in gabbro on The Lizard. He also analysed wavellite, tourmaline, and the uranium minerals torbernite and autunite, the arsenate scorodite, the lead mineral mimetite and the nickel mineral niccolite, and others. But he is best known for one of his earliest discoveries: in 1791, while analysing the minerals in a black sand he had discovered in the Manaccan valley, he isolated the calx of an unknown metal which he named manaccanite. Later in 1791, Martin Heinrich Klaproth discovered what is now known as titanium in the mineral rutile. Believing this to be a new discovery, Klaproth named it titanium after the Titans of Greek Mythology, but eventually it was clarified that Gregor made the discovery first. Gregor was credited with the discovery, but the element kept the name chosen by Klaproth. Gregor later found titanium in corundum from Tibet, and in a tourmaline from a local tin mine. See the main article on titanium for information on its many uses. Titanium is a transition metal with the atomic number of 22 and atomic mass 47.867.