Look up: pyrite

1. 
   Pyrite
   Pyrite has the formulae FeS2 and a relative hardness of 7. It is iron pyrite. Formed from cooling magma. It is found as an igneous segregation and also in metamorphic rocks and as vein deposits. Often found in sedimentary rocks being both primary and secondary in origin. Often mined for the gold or silver associated with it.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   pyrite
   [n] - a common mineral (iron disulfide) that has a pale yellow color
   Found on http://www.webdictionary.co.uk/definitio
   
   
3. 
   Pyrite
   Pyr'ite noun ; plural Pyrites . [ Confer French pyrite . See Pyrites .] (Min.) A common mineral of a pale brass- yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. « Hence sable coal his massy couch extends, And stars of gold the sparkling pyrite blends.» E. Darwin.
   Found on http://www.encyclo.co.uk/webster/P/203
   
   
4. 
   pyrite
   <chemistry> A name given to a number of common sulphur-containing metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish colour. ... The term was originally applied to the mineral pyrite, or iron pyrites, in allusion to its giving sparks when struck with steel. Arsenical pyrites, arsenopyrite. Auriferous ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
5. 
   pyrite
   iron pyrite noun a common mineral (iron disulfide) that has a pale yellow color
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
6. 
   Pyrite
   The mineral `pyrite`, or `iron pyrite`, is iron sulfide, FeS2. It has isometric crystals that usually appear as cubes. The cube faces may be striated (parallel lines on crystal surface or cleavage face) as a result of alternation of the cube and pyritohedron faces. Pyrite also frequently occurs as octahedral crystals and as pyritohedra (a dodecahedron with pentagonal faces). It has a slightly uneven and conchoidal fracture, a hardness of 6-6.5, a...
   Found on http://en.wikipedia.org/wiki/Pyrite
   
   
7. 
   Pyrite
   • (n.) A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide.
   Found on http://thinkexist.com/dictionary/meaning
   
   
8. 
   pyrite
   a naturally occurring iron disulfide mineral. The name comes from the Greek word pyr, `fire,` because pyrite emits sparks when struck by steel. ... [9 related articles]
   Found on http://www.britannica.com/eb/a-z/p/137
   
   
9. 
   Pyrite
   A hard, heavy, shiny, yellow mineral, FeS2 or iron disulfide, generally in cubic crystals. Also called iron pyrites, fool's gold, sulfur balls. Iron pyrite is the most common sulfide found in coal mines.
   Found on http://www.coaleducation.org/glossary.ht
   
   
10. 
    pyrite
    Pyrite. Credit: Mineral Information Institute Also known as iron pyrites (Fe₂S, iron (II) disulfide), a hard, yellow sulfide mineral sometimes called fool's gold because of its resemblance to gold. It occurs worldwide and is a major ore of sulfur. Pyrite crystallizes in th...
    Found on http://www.daviddarling.info/encyclopedi
    
    
11. 
    pyrite
    pyrite (pī'rīt) or iron pyrites (pīrī'tēz, pu–, pī'rīts) , pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of cubes and pyritohedrons) bu...
    Found on http://www.infoplease.com/ce6/sci/A08406