the rock forming the walls of a vein.
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How to use wall rock in a sentence
The undergrowth was very dense out to the edge of the perpendicular wall rock.Trails and Tramps in Alaska and Newfoundland | William S. Thomas
In igneous rock the ore-bearing solutions may have altered the wall rock to a dense mixture of quartz, sericite, and chlorite.
Their principal occurrence is in distinct fissure veins in igneous rocks, with more or less replacement of the wall rock.
The ore fills fissures to some extent, but is mainly a replacement of the wall rock.
In narrow lodes, some of the wall-rock must be cut away to get room for the workmen.Hittel on Gold Mines and Mining | John S. Hittell
British Dictionary definitions for wall rock
rock that is immediately adjacent to a mineral vein, fault, or igneous intrusion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012