a very common brass-yellow mineral, iron disulfide, FeS 2 , with a metallic luster, burned to sulfur dioxide in the manufacture of sulfuric acid: chemically similar to marcasite, but crystallizing in the isometric system.
Also, pyrites.
Also called iron pyrites.

1560–70; < Latin pyrītēs < Greek pyrī́tēs, noun use of adj.: of fire, so called because it produces sparks when struck. See pyr-, -ite1

pyritic [pahy-rit-ik, puh-] , pyritical, pyritous [puh-rahy-tuhs, pahy-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrite (ˈpaɪraɪt)
iron pyrites, Also called: pyrites, Nontechnical name: fool's gold a yellow mineral, found in igneous and metamorphic rocks and in veins. It is a source of sulphur and is used in the manufacture of sulphuric acid. Composition: iron sulphide. Formula: FeS2. Crystal structure: cubic
[C16: from Latin pyrites flint, from Greek puritēs (lithos) fire (stone), that is, capable of withstanding or striking fire, from pur fire]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"metallic iron disulfide," 1555, from O.Fr. pyrite (12c.), from L. pyrites, from Gk. pyrites lithos "stone of fire, flint" (so called because it glitters), from pyr (gen. pyros) "fire" (see pyre).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
pyrite   (pī'rīt')  Pronunciation Key 
A silver to yellow, metallic, cubic mineral. Pyrite often crystallizes in cubes or octahedrons but also occurs as shapeless masses of grains. It occurs in most types of rocks, and is used as a source of iron and in making sulfur dioxide. It is a polymorph of marcasite. Because of its shiny look and often yellow color, it is sometimes mistaken for gold and for this reason is also called fool's gold. Chemical formula: FeS2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Regeneration--can be performed either concurrently with coal pyrite leaching in
  a single operation or separately.
Pyrite oxidation is taking place on temporary surfaces, which are constant
  renewed and buried during mining operations.
Pyrite and marcasite are dimorphs, minerals that are identical in chemical
  composition but differ in crystalline form.
Not only does the pyrite in coal vary in morphology and size but also in
  stoichiometry and crystallinity.
Images for pyrite
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