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melaphyre

noun
mel·​a·​phyre | \ˈmeləˌfī(ə)r\
plural -s

Definition of melaphyre 

1 : a porphyritic rock consisting of phenocrysts of feldspar in a dark groundmass broadly : a porphyritic igneous rock with dark-colored aphanitic groundmass and phenocrysts of various kinds

2 : a Mesozoic basalt

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History and Etymology for melaphyre

French mélaphyre, from méla- mela- + -phyre

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