- a coarse-grained igneous rock composed almost entirely of olivine.
Origin of dunite
1865–70; named after Mt. Dun in New Zealand, where it is found; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- an ultrabasic igneous rock consisting mainly of olivine
C19: named after Dun Mountain, a mountain in New Zealand where it is abundant
- A coarse-grained igneous rock that consists mainly of olivine.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.