The Encyclopedia Americana (1920)/Adamite

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The Encyclopedia Americana
Adamite
Edition of 1920. See also Adamite on Wikipedia, and the disclaimer.

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 Zn3As2O3Zn(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.