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galena

(Encyclopedia)galena gəlēˈnə [key] or lead glance, lustrous, blue-gray mineral crystallizing usually in cubes, sometimes in octahedrons. It is the most important ore and the principal source of lead. It consist...

Peabody

(Encyclopedia)Peabody pēˈbədē, –bädē [key], city (1990 pop. 47,039), Essex co., NE Mass., a suburb of Boston, on the Danvers River; settled c.1633, inc. as South Danvers 1855, name changed 1868. Little is l...

Rzeszów

(Encyclopedia)Rzeszów zhĕˈsho͞of [key], city (1992 est. pop. 156,000), capital of Podkarpackie prov., SE Poland. It is a railway junction and an important industrial center, whose major industries produce metal...

Cerro de Pasco

(Encyclopedia)Cerro de Pasco sĕrˈrō ᵺā päsˈkō [key], city, capital of Pasco dept., central...

Pori

(Encyclopedia)Pori pôˈrē [key], Swed. Björneborg, city (1998 pop. 76,375), Western Finland prov., SW Finland, near the mouth of the Kokemaënjoki River. Timber and metals are exported, and chemical and wood pro...

hardening

(Encyclopedia)hardening, in metallurgy, treatment of metals to increase their resistance to penetration. A metal is harder when it has small grains, which result when the metal is cooled rapidly. Sometimes small ar...

neodymium

(Encyclopedia)neodymium nēˌōdĭmˈēəm [key], metallic chemical element; symbol Nd; at. no. 60; at. wt. 144.242; m.p. about 1,021℃; b.p. about 3,068℃; sp. gr. 7.004 at 20℃; valence +3. Neodymium is a lust...

thermoelectricity

(Encyclopedia)thermoelectricity, direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English phys...

cerium

(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...

oxide

(Encyclopedia)oxide, chemical compound containing oxygen and one other chemical element. Oxides are widely and abundantly distributed in nature. Water is the oxide of hydrogen. Silicon dioxide is the major componen...