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fool's gold

noun
1.
iron or copper pyrites, sometimes mistaken for gold.
Origin
1870-1875
1870-75, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fools gold

fool's gold

noun
1.
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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fools gold in Science
fool's gold
  (flz)   
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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