Infrared absorption spectra of nine chlorites from Japan have been obtained in the range of 450-900 cm−1. The relationship between infrared absorption spectra and chemical composition of chlorites is discussed and the conclusion is drawn that Al-rich chlorite, Mg-rich chlorite and Fe-rich chlorite have different infrared absorption spectra. Considerable attention is given to absorption bands near 540-560 cm−1, 620-692 cm−1 and 744-765 cm−1 of each spectrum. The wave number of absorption in the region of 540-560 cm−1, 620-692 cm−1 and 744-765 cm−1 are related to the amount of octahedral Al, Mg and Fe.

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