title: Diamonds in an upper mantle peridotite nodule from kimberlite in southern wyoming.
abstract: 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.
authors.forename: M E
authors.initials: ME
authors.lastname: McCallum
authors.forename: D H
authors.initials: DH
authors.lastname: Eggler