Diamonds in an Upper Mantle Peridotite Nodule from Kimberlite in Southern Wyoming

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Science  16 Apr 1976:
Vol. 192, Issue 4236, pp. 253-256
DOI: 10.1126/science.192.4236.253


Diamonds in a serpentinized garnet peridotite nodule from a diatreme in southern Wyoming are the first known occurrence in an upper mantle peridotite xenolith from a kimberlite intrusion in North America as well as the second authenticated occurrence of diamonds from kimberlite pipes in North America. The nodule is believed to have come from a section of depleted (partially melted) lherzolite at a depth of 130 to 180 kilometers.