veinstone

or vein stone

[veyn-stohn]
Also called phleb·o·lith [fleb-uh-lith] /ˈflɛb ə lɪθ/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for veinstone

veinstone

noun
  1. another word for gangue
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