| Porites | ‖n. [ NL., fr. Gr. po`ros a pore. ] (Zool.) An important genus of reef-building corals having small twelve-rayed calicles, and a very porous coral. Some species are branched, others grow in large massive or globular forms. [ 1913 Webster ] |
| Pyrites | n. [ L., fr. Gr. &unr_;, fr. &unr_; 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 ] ☞ 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 ]
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