Hornstein may refer to: Hornstein (rock), a silicate-rich chemical sediment and one of the siliceous rocks Hornstein (surname) Hornstein, Austria, Burgenland 6712 Hornstein (1990 DS1), a Main-belt Asteroid (f. 1990) Horenstein (disambiguation) von Hornstein, name of a family of imperial knights in the south of Germany, near Riedlingen