The determination of the optical properties of scorodite by E. S. Larsen2 has suggested that there are at least two minerals included under the name scorodite. One, with medium high indices of refraction, is the more common; the other although similar in general appearance and crystal form, has indices of refraction considerably higher (Kuira, Bungo, Japan). Unfortunately there is not sufficient material on the specimens of the latter type for a satisfactory chemical analysis but of the more normal scorodite there is abundant material available from the arsenic deposits of Gold Hill, Toole County, Utah.

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