chalcopyrite

[kal-kuh-pahy-rahyt]
noun
a very common mineral, copper iron sulfide, CuFeS 2 , occurring in brass-yellow crystals or masses: the most important ore of copper; copper pyrites.

Origin:
1825–35; chalco- + pyrite

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World English Dictionary
chalcopyrite (ˌkælkəˈpaɪraɪt, -ˈpaɪə-)
 
n
Also called: copper pyrites a widely distributed yellow mineral consisting of a sulphide of copper and iron in tetragonal crystalline form: the principal ore of copper. Formula: CuFeS2

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American Heritage
Science Dictionary
chalcopyrite   (kāl'kə-pī'rīt')  Pronunciation Key 
A brassy yellow, metallic, tetragonal mineral, usually occurring as shapeless masses of grains. Chalcopyrite is found in igneous rocks and copper-rich shales, and it is an important ore of copper. Because of its shiny look and often yellow color, it is sometimes mistaken for gold, and for this reason it is also called fool's gold. Chemical formula: CuFeS2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Chalcopyrite crystal is anhedral and occurs as isolated crystal in feldspar.
Where copper sulfide minerals are present, chalcopyrite is dominant.
Chalcopyrite and pyrite are disseminated in narrow envelopes in the wall rocks
  surrounding the dikes.
Oxidation obscures original textures and may have obliterated evidence of
  primary chalcopyrite.
Image for chalcopyrite
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