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wall rock

noun, Mining.
the rock forming the walls of a vein.
Origin of wall rock
An Americanism dating back to 1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for wall rock
Historical Examples
  • 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.

British Dictionary definitions for wall rock

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
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