haytoriteMin.|ˈheɪtəraɪt| [Named 1827, from Hay Tor, in Devonshire.] A pseudomorphic chalcedony, having the form of datolite. 1827Philos.Mag.Ser. ii. I. 39 We contemplate calling it Haytorite in honor of its birthplace.1868Dana Min. 382 Haytorite is datolite altered to chalcedony.