A collection of the arsenical ores of the White Caps Mine at Manhattan, Nevada, secured for the Harvard Mineralogical Museum from H. G. Clinton, contained well crystallized stibnite and orpiment. The study of these crystals has added to our knowledge of the crystallography of these minerals and is therefore presented here m some detail. The geology of the district has been described by Ferguson.1 The ores occur as replacement deposits in a Cambrian limestone.

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