Columbia Encyclopedia

(Encyclopedia) smaltite smôlˈtīt [key], opaque tin-white to steel-gray mineral of the pyrite group, a compound of cobalt and arsenic. It occurs in massive form, occasionally in crystals (cubes) of the isometric s...

(Encyclopedia) sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone va...

(Encyclopedia) Mueller, Robert Swan, 3d, 1944–, American law enforcement official, b. New York City, B.A. Princeton, 1966, M.A. New York Univ., 1967, J.D. Univ. of Virginia School of Law, 1973. After serving in Vi...

(Encyclopedia) Graeae or Graiae both: grēˈī [key], in Greek mythology, daughters of Ceto and Phorcus, called Deino, Enyo, and Pemphredo. The personifications of old age, they were born with gray hair and only one...

(Encyclopedia) squirrel, name for small or medium-sized rodents of the family Sciuridae, found throughout the world except in Australia, Madagascar, and the polar regions; it is applied especially to the tree-living...

(Encyclopedia) duiker dīˈkər, dāˈ– [key], name for members of a group of small, light antelopes, found in thick brush and forest over most of Africa. All stand under 25 in. (64 cm) high at the shoulder. They ...

(Encyclopedia) harbor seal, most commonly seen seal of the Northern Hemisphere, Phoca vitulina. Harbor seals are found along coasts and in sheltered bays and harbors of North America, Europe, and NE Asia. They range...

(Encyclopedia) Pampa pămˈpə [key], city (1990 pop. 19,959), seat of Gray co., extreme N Tex. This cow town on the Panhandle plains still ships cattle and wheat and packs meat, but the discovery of oil and gas has...

(Encyclopedia) Chesapeake and Delaware Canal, sea-level canal, 19 mi (31 km) long, 250 ft (76 m) wide, and 27 ft (8.2 m) deep, connecting the head of Chesapeake Bay with the Delaware River. Built in 1824–29, the c...

(Encyclopedia) grisaille grĭzīˈ, –zālˈ, Fr. grēzäˈyə [key], a monochrome painting and drawing technique executed in tones of gray. Such works were often produced in the Renaissance to simulate sculpture, ...