peridotite

名词 peridotite:

1. a dark coarse-grained igneous rock consisting principally of olivine

per.i.do.tite

n.（名词）
Any of a group of igneous rocks composed mainly of olivine and various pyroxenes and having a granitelike texture.
橄榄岩：含有大量橄榄石和各种辉石并有花岗岩状质地的岩石