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New chemical analyses are given for samples of hortonolite dunite from the Mooihoek Mine, Transvaal, and from the type locality at Monroe, New York; and measurements are given of wave velocities to 10 kb for the Monroe hortonolite. The olivine of the Mooihoek hortonolite has the composition Fo44Fa56, but about 10% has been altered. The olivine of the Monroe hortonolite has the composition Fo37Fa57Te6, and the velocities and density are somewhat higher than those of the Mooihoek rock. Extrapolation to fayalite suggests that the compressibility changes relatively little with iron content in the forsterite-fayalite series.
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Mao et al. (1970) studied this question.
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