oceanite
/ˈəʊʃ(ə)nʌɪt/ /ˈəʊsɪənʌɪt/Geology
noun
Any of various dark-coloured basalts which are very rich in olivine.
Origin
1920s; earliest use found in George Walter Tyrrell (b. 1883). From ocean + -ite, after French océanite, so called because of the abundance of such rocks on ocean islands.
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