The Encyclopedia Americana (1920)/Adamite

ADAMITE (named for M. Adam, a French mineralogist), a mineral, isomorphous with olivenite, and occurring in small orthorhombic crystals that are often grouped in fine granular aggregations. It is an arsenate of zinc, having the formula Zn$3$As$2$O$3$Zn(OH)$2$, although copper and cobalt may also be present. Its hardness is 3.5, and its sp. gr. 4.35. Its color is variable. It occurs at Cap Garonne, near Hyères, France; and also at Laurium, Greece, and in certain parts of Chile.