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sodium

(Encyclopedia)sodium, a metallic chemical element; symbol Na [Lat. natrium]; at. no. 11; at. wt. 22.98977; m.p. 97.81℃; b.p. 892.9℃; sp. gr. 0.971 at 20℃; valence +1. Sodium is a soft, silver-white metal. Ext...

Tirebolu

(Encyclopedia)Tirebolu tĭrĕˈbōlo͞o [key], anc. Tripolis, town, N Turkey, a port on the Black Sea. Its exports include copper, manganese, and zinc. The remains of a Byzantine fortress are there. ...

Takaoka

(Encyclopedia)Takaoka täkäˈôkä [key], city (1990 pop. 175,466), Toyama prefecture, W central Honshu, Japan, on the Sho River. A center for the Japanese aluminum industry, Takaoka also produces paper, copper, a...

Daly, Marcus

(Encyclopedia)Daly, Marcus, 1841–1900, American copper magnate, b. Ireland. He went to New York City at 15 and later moved to California, where he worked as a miner. He was employed by the “silver kings,” J. ...

aluminum

(Encyclopedia)aluminum ălˌyo͞omĭnˈēəm [key], metallic chemical element; symbol Al; at. no. 13; at. wt. 26.98154; m.p. 660.37℃; b.p. 2,467℃; sp. gr. 2.6989 at 20℃; valence +3. Aluminum is a silver-white...

Oskarshamn

(Encyclopedia)Oskarshamn ôsˌkärs-häˈmən [key], city (1990 pop. 17,790), Kalmar co., SE Sweden, a seaport on the Kalmarsund (an arm of the Baltic Sea); chartered 1856. Manufactures of this industrial center in...

britannia metal

(Encyclopedia)britannia metal, silvery-white alloy of tin with antimony, copper, and sometimes bismuth and zinc. It is very similar in appearance to pewter, but is harder. It is used widely for the manufacture of t...

azurite

(Encyclopedia)azurite ăzhˈərīt [key], blue mineral, the basic carbonate of copper, occurring in monoclinic crystals or masses that range from transparent to translucent and opaque. It is usually associated with...

Timmins

(Encyclopedia)Timmins, town (1991 pop. 47,461), central Ont., Canada, on the Mattagami River. Timmins is the commercial center of the rich Porcupine gold-mining district, where gold was first discovered in 1909. Si...

Tati

(Encyclopedia)Tati täˈtē [key], region, c.2,070 sq mi (5,360 sq km), NE Botswana. Nickel, copper, and manganese are mined in the region. Tati was a source of gold for centuries; mining ceased there in the early ...