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Related to toadstone: Bufonite
A stone once worn as a charm and believed to have been formed in the body of a toad.
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.
(Geological Science) rare an amygdaloidal basalt occurring in the limestone regions of Derbyshire
[C18: perhaps from a supposed resemblance to a toad's spotted skin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of various stonelike objects, usu. fossilized animal parts, formerly supposed to have been formed in the body of a toad, worn esp. as amulets to protect against poison.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.