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A dark igneous porphyry embedded with feldspar crystals.

[French mélaphyre : Greek melās, black + French porphyre, porphyry (from Medieval Latin porphyrium; see porphyry).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) geology obsolete a type of weathered amygdaloidal basalt or andesite
[C19: via French from Greek melas black + (por)phura purple]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The highest cost was obtained for the hauling of melaphyre aggregate from Czarny Bor quarry to Augustow ($27/1000 kg with distance of 672 km) while the lowest hauling cost was for the transportation of the aggregate from the glacier deposits from the quarry located 30 km from the HMA plant in Augustow.