fools gold

fool's gold

noun
iron or copper pyrites, sometimes mistaken for gold.

Origin:
1870–75, Americanism

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Collins
World English Dictionary
fool's gold
 
n
any of various yellow minerals, esp pyrite or chalcopyrite, that can be mistaken for gold

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fool's gold   (flz)  Pronunciation Key 
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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