A new analysis and two previously published analyses of peridotite mylonites are presented. The mylonitic character of the peridotites had earlier been established. Available data indicate that they are more accurately designated peridotites than dunites, in that they contain significant amounts of pyroxenes, amphiboles, and spinel, together with the predominant olivine. The view that the peridotites are the product of an extraction process from a less refractory peridotite, richer in alkalis, is favored.

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