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melaphyre

noun mel·a·phyre \ ˈmeləˌfī(ə)r \
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Definition of melaphyre

plural -s
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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Origin and Etymology of melaphyre

French mélaphyre, from méla- mela- + -phyre

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