What does dunitic mean?
Dunitic is a technical adjective used in geology to describe rocks, formations, or compositions consisting of, or closely resembling, dunite — a coarse-grained igneous rock made almost entirely of the green mineral olivine. The term derives from dunite, itself named after Mount Dun in New Zealand, where the rock type was first described. In practice, geologists use dunitic when characterizing parts of ophiolite sequences, mantle xenoliths, layered intrusions, or ore deposits such as those bearing chromite or platinum-group metals, where olivine-dominated material plays a significant role. Because it belongs to specialist petrological terminology rather than everyday English, the word carries a formal, scientific register and would rarely appear outside academic papers, field reports, or textbooks. Its value lies in precision: rather than describing a rock merely as ultramafic or olivine-rich, calling it dunitic signals a specific composition dominated by olivine, making the term useful to anyone reading or writing about igneous petrology and mantle processes.
adjectiveRelating to or consisting of dunite, a coarse-grained igneous rock composed almost entirely of the mineral olivine.
- Of, relating to, or consisting of dunite (an ultramafic igneous rock made chiefly of olivine).
"The drill cores revealed thick dunitic layers beneath the overlying gabbro."
"The ophiolite complex contains extensive dunitic bodies near its base."
"Petrographic analysis classified the sample as strongly dunitic in composition."
Named after a single mountain in New Zealand — Mount Dun — this word describes one of the densest rocks in Earth's upper mantle.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dunitic
Dunitic is formed by adding the adjectival suffix -ic to dunite, the name of an ultramafic rock composed almost entirely of olivine. Dunite was named after Mount Dun in New Zealand, where the rock was first described in the late nineteenth century. As a derivative formation, dunitic shares its origin entirely with that place-name root and has no broader cognates in other languages beyond translations of the geological term itself.
Related word forms
How dunitic is actually used
Strictly technical vocabulary, used almost exclusively in petrology, geology, and mining literature; it would be out of place in general writing.
Easily confused with dunitic
Dunite is the noun naming the rock itself, while dunitic is the adjective describing things made of or resembling that rock.