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3) Bancroft, G. M. and Burns, R. G. (1969) Mössbauer and absorption spectral study of alkali amphiboles. Miner. Soc. Amer. Special Paper, 2, 137–148.
4) Ernst, W. G. and Wai, C. M. (1970) Mössbauer, infrared, X-ray and optical study of cation ordering and dehydrogenation in natural and heat-treated sodic amphiboles. Amer. Mineral., 55, 1226–1258.