malthaciteMin.|ˈmælθəsaɪt| Also malthazite. [ad. G. malthazit (A. Breithaupt 1837), f.Gr. µαλθακ-ός soft: see -ite.] A variety of fullers' earth (Chester Dict.Min. 1896). 1849Watts tr.Gmelin's Handbk.Chem. III. 419. 1883Encycl.Brit. XVI. 424/2 Malthazite, from Steindörfel near Bautzen.