stink stone

or stink·stone


noun

any of various limestones that emit an unpleasant odor when scratched or struck.
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British Dictionary definitions for stinkstone

stinkstone
/ (ˈstɪŋkˌstəʊn) /

noun

any of various rocks producing a fetid odour when struck, esp certain limestones
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