* Copper is the only metal which occurs native abundantly in large masses; it is found also in various ores, of which the most important are chalcopyrite, chalcocite, cuprite, and malachite. Copper mixed with tin forms bell metal; with a smaller proportion, bronze; and with zinc, it forms brass, pinchbeck, and other alloys.

My friends filled my pockets with coppers.
Franklin.

* Copper is often used adjectively, commonly in the sense of made or consisting of copper, or resembling copper; as, a copper boiler, tube, etc.

All in a hot and copper sky.
Coleridge.

It is sometimes written in combination; as, copperplate, coppersmith, copper- colored.

Copper finch. (Zoöl.) See Chaffinch. -- Copper glance, or Vitreous copper. (Min.) See Chalcocite. -- Indigo copper. (Min.) See Covelline.