Columbia Encyclopedia

(Encyclopedia) Yap yăp, yäp [key], state (1990 pop. 10,886), c.47 sq mi (121 sq km), in the W Caroline Islands, W Pacific. One of four states comprising the Federated States of Micronesia, the island group was for...

(Encyclopedia) topaz tōˈpăz [key], aluminum silicate mineral with either hydroxyl radicals or fluorine, Al2SiO4(F,OH)2, used as a gem. It is commonly colorless or some shade of pale yellow to wine-yellow; pale bl...

(Encyclopedia) tourmaline to͝orˈməlĭn, –lēn [key], complex borosilicate mineral with varying amounts of aluminum, iron, magnesium, sodium, lithium, potassium, and sometimes other elements, used as a gem. It o...

(Encyclopedia) Zorach, William zŏrˈäk [key], 1887–1966, American sculptor, b. Lithuania. His family emigrated to the United States when he was four and settled near Cleveland. After studying at the Cleveland Sc...

(Encyclopedia) sapphire, precious stone. A transparent blue corundum, it is classified among the most valuable of gems. Sapphires are found chiefly in Madagascar, Sri Lanka, and Myanmar and also in Thailand, Tanzani...

(Encyclopedia) plaster casting, as a sculpture process, is of three kinds. One employs a waste mold, another a piece mold (both plaster of paris), and the third a gelatin mold; all reproduce the original clay or wax...

(Encyclopedia) Göbekli Tepe, Neolithic site in SE Turkey, c. 9 mi (15 km) NE of Şanlıurfa, that dates to c.11,000 b.c. or earlier. Although previously known, it was first recognized as a Neolithic site in 1994 by...

(Encyclopedia) Stonehenge stōnˈhĕnjˌ [key], group of standing stones on Salisbury Plain, Wiltshire, S England. Preeminent among megalithic monuments in the British Isles, it is similar to an older and larger mon...

(Encyclopedia) terra-cotta tĕrˈə kŏtˈə [key] [Ital.,=baked earth], form of hard-baked pottery, widely used in the decorative arts, especially as an architectural material, either in its natural red-brown color...

(Encyclopedia) Iron Age, period in the development of industry that begins with the general use of iron and continues into modern times. In Asia, Egypt, and Europe it was preceded by the Bronze Age. It did not begin...