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sphalerite

(Encyclopedia)sphalerite sfălˈərīt, sfāˈ– [key], mineral composed of zinc sulfide, usually containing some iron and a little cadmium. It occurs in crystals of the isometric system but more generally in clea...

Eocene epoch

(Encyclopedia)Eocene epoch ēˈəsēnˌ [key], second epoch of the Tertiary period in the Cenozoic era of geologic time, from approximately 54.9 to 38 million years ago. The Eocene in North America was marked by th...

praseodymium

(Encyclopedia)praseodymium prāˌzēōdĭmˈēəm, –sēō– [key] [Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.90765; m.p. 931℃; b.p. 3,512℃; sp. gr. about 6.8; valence +...

Lyon, Mary

(Encyclopedia)Lyon, Mary līˈən [key], 1797–1849, American educator, founder of Mt. Holyoke College, b. Buckland, Mass. She attended three academies in Massachusetts; later she taught at Ashfield, Mass., London...

Hackensack, city, United States

(Encyclopedia)Hackensack, city (2020 pop. 46,030), seat of Bergen co., NE N.J., on the Hackensack River, a residential and industrial suburb of New York City; settled...

Gawain, Sir

(Encyclopedia)Gawain, Sir gäˈwān, –wĭn [key], one of the most popular heroes of Arthurian legend; nephew of King Arthur. He was regarded, particularly in the early romances, as the model of chivalry—pure, b...

eggplant

(Encyclopedia)eggplant, name for Solanum melongena, a large-leaved woody perennial shrub (often grown as an annual herb) of the family Solanaceae (nightshade family), and also cultivated for its ovoid fruit. Native...

Allouez, Claude Jean

(Encyclopedia)Allouez, Claude Jean klōd zhäN älwāˈ [key], 1622–89, French Jesuit missionary in Canada and the American Midwest. After arriving (1658) in Canada he served at posts in the St. Lawrence region u...

Connelly, Marc

(Encyclopedia)Connelly, Marc (Marcus Cook Connelly) kŏnˈəlē [key], 1890–1981, American dramatist, b. McKeesport, Pa. He is best known for his Pulitzer Prize winning play The Green Pastures (1930), a fantasy o...

quartzite

(Encyclopedia)quartzite, usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by ...