A metamorphic biotite from Lemhi County, Idaho, has a chlorine content of 1.11 per cent and a fluorine content of 0.23 per cent. The biotite occurs in schist, associated with garnet, muscovite and quartz, smaller amounts of tourmaline and zircon, and a few rare grains of sphene. A complete analysis is given for the biotite, the mineralogy of the schist is described, and the features of its field occurrence are outlined.

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