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turquoise

(Encyclopedia)turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has a waxy luster; ...

Sorenstam, Annika

(Encyclopedia)Sorenstam, Annika, 1970–, Swedish golfer. Acclaimed by many as golf's greatest female player, she dominated the game in the late 1990s and early 2000s. She played for the Swedish national team (1987...

Prescott, Edward Christian

(Encyclopedia)Prescott, Edward Christian, 1940–, American economist, b. Glen Falls, N.Y., Ph.D. Carnegie Mellon Univ., 1967. Prescott has taught at Carnegie Mellon (1971–80), the Univ. of Minnesota (1980–98, ...

Ostrom, Elinor Awan

(Encyclopedia)Ostrom, Elinor Awan, 1933–2012, American political economist, b. Los Angeles, Ph.D. Univ. of California, Los Angeles, 1965. She was on the faculty of the Univ. of Indiana, Bloomington, from 1965 unt...

Oratory, Congregation of the

(Encyclopedia)Oratory, Congregation of the [Lat. abbr., Cong. Orat.], in the Roman Catholic Church, founded in 1575, an association of secular priests organized into independent communities according to the rule wr...

Katz, Alex

(Encyclopedia)Katz, Alex, 1927–, American painter, b. Brooklyn, N.Y., studied Cooper Union, New York City (1946–49), Skowhegan School, Maine (1949–50). At a time when abstract expressionism captured most crit...

Colorado Plateau

(Encyclopedia)Colorado Plateau, physiographic region of SW North America, c.150,000 sq mi (388,500 sq km), in Arizona, Utah, Colorado, and New Mexico, including the “Four Corners” area. It is characterized by b...

Escalante, Silvestre Vélez de

(Encyclopedia)Escalante, Silvestre Vélez de sēlvāˈstrā vāˈlāth dā āskälänˈtā [key], fl. 1769–79, Spanish explorer in the American Southwest and Far West, a Franciscan missionary. He was in charge of...

Guadalupe Hidalgo, Treaty of

(Encyclopedia)Guadalupe Hidalgo, Treaty of, 1848, peace treaty between the United States and Mexico that ended the Mexican War. Negotiations were carried on for the United States by Nicholas P. Trist. The treaty wa...

Jeffords, Thomas

(Encyclopedia)Jeffords, Thomas, 1832–1914, American pioneer, b. Chautauqua co., N.Y. He went to Arizona in 1862 as a U.S. army scout and messenger and later became a stage driver. In 1866–67, he controlled mail...