noun Petrology.
a type of dark igneous rock embedded with feldspar crystals, related to basalt.

melaphyric [mel-uh-fir-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
melaphyre (ˈmɛləˌfaɪə)
obsolete geology a type of weathered amygdaloidal basalt or andesite
[C19: via French from Greek melas black + (por)phura purple]

Collins English Dictionary - Complete & Unabridged 10th Edition
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