HAUSMANN, JOHANN FRIEDRICH LUDWIG (1782-1859), German mineralogist, was born at Hanover on Feb. 22, 1782. He was educated at Gottingen, and in 1811 returned there as professor, holding his chair for over 4o years. Hausmann wrote on gypsum, pyrites, felspar, tachylite, cordierite and on some eruptive rocks, and he devoted much attention to the crystals developed during metallurgical processes. He died Dec. 26,