Four exposures of peridot{re occur near Murfreesboro, Pike County, Arkansas, and.three of these have produced diamonds.The exposure first discovered lies 2• miles south-southeast of Murfreesboro, near the confluence of Prairie Creek with Little Missouri River, and is thus named the Pr;firie Creek peridotite area.(See Fig. 58.)Diamonds were discovered on the area in I9O6 and since then several thousand stones, ranging in weight from a small fraction of a carat to 2o• carats, have been pro-
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Miser et al. (1922) studied this question.