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fool's gold

iron or copper pyrites, sometimes mistaken for gold.
1870-75, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for fool's gold
  • Don't be fooled by the glitter of pyrite: it's fool's gold.
  • Under the oxygen-poor conditions of the swamp, sulfur combined with iron to form iron pyrite, or fool's gold.
British Dictionary definitions for fool's gold

fool's gold

any of various yellow minerals, esp pyrite or chalcopyrite, that can be mistaken for gold
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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fool's gold in Science
fool's gold
Any of several minerals, especially pyrite and chalcopyrite, sometimes mistaken for gold.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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