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Kimberlite: An ultramafic igneous rock containing at least 35 percent olivine, with one or more of the following in the groundmass: monticellite, phlogopite, carbonate, serpentine, diopside. No leucite is allowed in the definition of kimberlite. (Definition from Jackson, J.A., ed., 1997, Glossary of geology [4th ed.]: Alexandria, Va., American Geological Institute, 769 p.)