[1] : The Collaborative International Dictionary of English v.0.48

pyrites \pyri"tes\, n. l., fr. gr. ?, fr. ? fire. see pyre.
   min.
   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,
      etc.

   yellow pyrites, or copper pyrites, the sulphide of copper
      and iron; chalcopyrite.
      1913 webster pyritic
see also:
pyre arsenical pyrites auriferous pyrites auriferous capillary pyrites common pyrites 
hair pyrites iron pyrites pyrite magnetic pyrites tin pyrites 
white iron pyrites yellow pyrites copper pyrites 

[2] : The Collaborative International Dictionary of English v.0.48

millerite \mil"lerite\, 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
see also:
hair pyrites 

Hair >> H Words
Hair, definition of term: Hair
hair_pag1.html

Hair Shirt >> H Words
Hair Shirt, definition of term: Hair Shirt
hair+shirt_pag1.html

Hair Spray >> H Words
Hair Spray, definition of term: Hair Spray
hair+spray_pag1.html

Hair Dryer >> H Words
Hair Dryer, definition of term: Hair Dryer
hair+dryer_pag1.html

Hair Ball >> H Words
Hair Ball, definition of term: Hair Ball
hair+ball_pag1.html

Guard Hair >> G Words
Guard Hair, definition of term: Guard Hair
guard+hair_pag1.html

Camels Hair >> C Words
Camels Hair, definition of term: Camels Hair
camels+hair_pag1.html

Hair Of The Dog >> H Words
Hair Of The Dog, definition of term: Hair Of The Dog
hair+of+the+dog_pag1.html