Definition of tholeiite
: a basaltic rock that is rich in aluminum and low in potassium, is found typically in the ocean floor, and is prob. derived from the earth's mantle
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Origin and Etymology of tholeiite
German Tholeiit, from Tholey, village in Saarland, Germany + German -it -ite
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Britannica.com: Encyclopedia article about tholeiite
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