Abstract
A white chlorite occurring in metamorphosed limestones of the Philipsburg district of Montana was mentioned by Calkins2 under the name leuchtenbergite. Several other white chlorites having been described since the publication of this paper, Mr. Calkins requested that his specimens, which were preserved in the National Museum, be reexamined. The chlorite has been analyzed in the museum laboratory, and the results of the analysis confirm the original identification, the mineral being a typical leuchtenbergite. The specimens examined are numbered P 480 in the type collection from the Philipsburg district. Since the locality gives promise of furnishing leuchtenbergite in abundant finely crystallized specimens, the occurrence is directed to the attention of mineralogists by the following note.
