Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of a series of igneous rocks similar in composition to basalt but having more silica and iron and less aluminum.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology An
igneous basalticrock , formed frommagma rich inmagnesium andiron .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Tholei, (Tholey), municipality in Saarland, Germany, where it is found.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
From German Tholeiit, from Tholei, a village in western Germany.
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Examples
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The coastline is also cut through by olivine and tholeiite dykes, a good example of which can be seen at Roveran Valley Head.
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Myles L. Miller, Scott S. Hughes, 2009, Mixing primitive and evolved olivine tholeiite magmas in the Eastern Snake River Plain, Idaho
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