Peridotite : Rock comprising the uppermost mantle, it is composed mainly of olivine [(Mg, Fe)2SiO4 and pyroxene [(Mg, Fe, Ca)SiO3; other minerals, such as garnet, can also be present
Peter Bormann, Keiiti Aki, William H. K. Lee, and Johannes Schweitzer (Compilers and Amenders), Glossary of Terms Interest to Earthquake and Engineering Seismologists (Version 1), Publication records from external use of GFZ scientific infrastructure, Germany 2011. http://gfzpublic.gfz-potsdam.de/pubman/item/escido c:56137:3/component/escidoc:56143/Glossary_rev1.pd f, (ND/ Erthq - Amer) {980}