针镍矿

Pyrites \Py*ri"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.

Note: 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 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.

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}.