Composite inclusions with diamond, phengite, calcite and graphite in UHP pelitic gneisses.
((http://earth2005.jtbcom.co.jp/session/pdf/g025/g025p-007_e.pdf (Yoshihide Ogasawara; Rentaro Shimizu : Microdiamond in pelitic gneisses from the Kokchetav Massif, Kazakhstan http://www.earth.edu.waseda.ac.jp)).)