veinstone

vein·stone

 (vān′stōn′)
n.
Mineral matter in a vein exclusive of the ore; gangue.
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.

veinstone

(ˈveɪnˌstəʊn)
n
(Mining & Quarrying) another word for gangue
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 ?
Its occurrence seems restricted to the interior of cavities in the veinstone.
Traces of ancient excavations on many of the veins were very plainly to be seen by prospectors in 1863, and there were, and still remain, heaps of debris consisting of the veinstone with small fragments of ore.