[pahy-rahy-teez, puh-, pahy-rahyts]
noun, plural pyrites. Mineralogy.
any of various other metallic sulfides, as of copper or tin.

1545–55; < Latin pyrītes (plural); see pyrite Unabridged


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]

pyrites (paɪˈraɪtiːz, (in combination) ˈpaɪraɪts)
n , pl -tes
1.  another name for pyrite
2.  any of a number of other disulphides of metals, esp of copper and tin

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
The ore is mixed with other metalliferous minerals, such as sphalerite, copper
  pyrites and iron pyrites.
Coal pyrites are minerals and rocks found in coal that are not milled in the
  coal pulverizers.
The pyrites are currently discharged to the tailings impoundments, but they
  could be segregated.
The reactivity of fine grained pyrites reflects the fact that acid generating
  reactions occur at the mineral surface.
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