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2 definitions found
 for Hair pyrites
From The Collaborative International Dictionary of English v.0.48 :

  Pyrites \Py*ri"tes\, n. [L., fr. Gr. ?, fr. ? fire. See Pyre.]
     A name given to a number of metallic minerals, sulphides of
     iron, copper, cobalt, nickel, and tin, of a white or
     yellowish color.
     [1913 Webster]
     Note: The term was originally applied to the mineral pyrite,
           or iron pyrites, in allusion to its giving sparks when
           struck with steel.
           [1913 Webster]
     Arsenical pyrites, arsenopyrite.
     Auriferous pyrites. See under Auriferous.
     Capillary pyrites, millerite.
     Common pyrites, isometric iron disulphide; pyrite.
     Hair pyrites, millerite.
     Iron pyrites. See Pyrite.
     Magnetic pyrites, pyrrhotite.
     Tin pyrites, stannite.
     White iron pyrites, orthorhombic iron disulphide;
        marcasite. This includes cockscomb pyrites (a variety of
        marcasite, named in allusion to its form), spear pyrites,
     Yellow pyrites, or Copper pyrites, the sulphide of copper
        and iron; chalcopyrite.
        [1913 Webster] Pyritic

From The Collaborative International Dictionary of English v.0.48 :

  Millerite \Mil"ler*ite\, n. [From W. H. Miller, of Cambridge,
     Eng.] (Min.)
     A sulphide of nickel, commonly occurring in delicate
     capillary crystals, also in incrustations of a bronze yellow;
     -- sometimes called hair pyrites.
     [1913 Webster]

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