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fool's gold

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noun
  1. iron or copper pyrites, sometimes mistaken for gold.
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Origin of fool's gold

An Americanism dating back to 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for fool's gold

fool's gold

noun
  1. any of various yellow minerals, esp pyrite or chalcopyrite, that can be mistaken for gold
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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

fool's gold in Science

fool's gold

[fōōlz]
  1. Any of several minerals, especially pyrite and chalcopyrite, sometimes mistaken for gold.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.