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feldspar

(Encyclopedia)feldspar fĕlˈspär [key], an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron...

Henan

(Encyclopedia)Henan or Honan both: ho͝oˈnänˈ [key], province, c.65,000 sq mi (168,350 sq km), NE China. The capital is ...

Harpers Ferry

(Encyclopedia)Harpers Ferry, town (2020 pop. 285), Jefferson co., easternmost W Va., at the confluence of the Shenandoah and Potomac rivers; inc. 1763. The town is a ...

Andaman and Nicobar Islands

(Encyclopedia)Andaman and Nicobar Islands ănˈdəmən, nĭkˈōbär [key], union territory (2001 provisional pop. 356,265), India, in the Bay of Bengal. Port Blair, in the Andamans, is...

garnet

(Encyclopedia)garnet, name applied to a group of isomorphic minerals crystallizing in the cubic system. They are used chiefly as gems and as abrasives (as in garnet paper). The garnets are double silicates; one of ...

Kahn, Louis Isadore

(Encyclopedia)Kahn, Louis Isadore , kän [key], 1901–74, American architect, b. Estonia. He and his family moved to Philadelphia in 1905, and he later studied at the Univ. of Pennsylvania. From the 1920s through ...

Mixtec

(Encyclopedia)Mixtec mĭsˈtĕk [key], Native American people of Oaxaca, Puebla, and part of Guerrero, SW Mexico, one of the most important groups in Mexico. Although the Mixtec codices constitute the largest colle...

Machu Picchu

(Encyclopedia)Machu Picchu mäˈcho͞o pēkˈcho͞o [key], Inca site in Peru, about 50 mi (80 km) NW of Cuzco. It is perched high upon a rock in a narrow saddle between two sharp mountain peaks and overlooks the Ur...

Tuva Republic

(Encyclopedia)Tuva Republic or Tyva Republic both: to͞oˈvə, Rus. to͞oväˈ, Tuvan to͞owäˈ [key], constituent republic (1990 est. pop. 366,000), 65,830 sq mi (170,500 sq km), extreme S Siberian Russia, on the...

well

(Encyclopedia)well, aperture in the earth's surface through which substances in a natural underground reservoir, such as water, gas, oil, salt, and sulfur, can flow or be pumped to the surface. In the United States...