peridotite
Concise Oxford English Dictionary © 2008 Oxford University Press:
peridotite /ˈpɛrɪdɒtʌɪt/
▶noun Geology a dense, coarse-grained plutonic rock containing a large amount of olivine, believed to be the main constituent of the earth's mantle.
– derivatives
peridotitic adjective.
peridotitic adjective.
'peridotite' also found in these Oxford entries:

