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flint, mineral

(Encyclopedia)flint, variety of quartz that commonly occurs in rounded nodules and whose crystal structure is not visible to the naked eye. Flint is dark gray, smoky brown, or black in color; pale gray flint is cal...

hematite

(Encyclopedia)hematite hĕmˈətīt [key], mineral, an oxide of iron, Fe2O3, containing about 70% metal, occurring in nature in red to reddish-brown earthy masses and in steel-gray to black crystalline forms. Hemat...

dolomite

(Encyclopedia)dolomite dōˈləmītˌ, dŏlˈə– [key]. 1 Mineral, calcium magnesium carbonate, CaMg (CO3)2. It is commonly crystalline and is white, gray, brown, or reddish in color with a vitreous to pearly lus...

Jumel Mansion

(Encyclopedia)Jumel Mansion jo͞omĕlˈ, zho͞o– [key], historic house, New York City. The sturdy Georgian mansion was completed in 1766 by Roger Morris, one of the city's wealthy merchants. In the American Revol...

Steptoe, Patrick Christopher

(Encyclopedia)Steptoe, Patrick Christopher, 1913–88, British surgeon, M.D. St. George Hospital Medical School, Univ. of London, 1939. Steptoe worked at Oldham General Hospital from 1951 to 1980, when he and Briti...

Stoneman, George

(Encyclopedia)Stoneman, George, 1822–94, Union general in the American Civil War, b. Busti, N.Y. As commander of Fort Brown, Tex., in Feb., 1861, he refused to obey the order of General Twiggs to surrender to Tex...

Tantlinger, Keith Walton

(Encyclopedia)Tantlinger, Keith Walton, 1919–2011, b. Orange, Calif. Trained as a mechanical engineer, he was the inventor of the modern shipping container. After stints at Douglas Aircraft Co. (later McDonnell D...

Skidmore, Owings and Merrill

(Encyclopedia)Skidmore, Owings and Merrill, American architectural firm founded in 1936 in New York City by Louis Skidmore (1897–1962), Nathaniel A. Owings (1903–84), and John O. Merrill (1896–1975). The firm...

agouti

(Encyclopedia)agouti əgo͞oˈtē [key], name applied to rabbit-sized rodents of the genus Dasyprocta, found in Central and South America and in the West Indies. They have slender limbs with five front and three hi...

Philby, Kim

(Encyclopedia)Philby, Kim (Harold Adrian Russell Philby), 1912–88, British double agent, son of Harry St. John Bridger Philby, studied Trinity College, Cambridge. A longtime high-ranking member of Britain's MI6 i...