(Encyclopedia) spinel, magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous rocks, in…
(Encyclopedia) color blindness, visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is…
(Encyclopedia) MenomineeMenomineemənŏmˈənē [key], city (1990 pop. 9,398), seat of Menominee co., N Mich., W Upper Peninsula, on Green Bay at the mouth of the Menominee River; inc. 1883. It is a…
(Encyclopedia) Champion, uninc. community in the town of Green Bay, Brown co., NE Wis., NE of the city of Green Bay. It is noted for the Shrine of Our…
(Encyclopedia) Caño Cristales, river, c.62 mi (100 km) long, central Colombia, rising in Serranía de la Macarena National Park and flowing SE to the Guayabero River. Also known as the “River of Five…
(Encyclopedia) tourmalinetourmalinet&oobreve;rˈməlĭn, –lēn [key], complex borosilicate mineral with varying amounts of aluminum, iron, magnesium, sodium, lithium, potassium, and sometimes other…
(Encyclopedia) corundumcorundumkərŭnˈdəm [key], mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal…
(Encyclopedia) Fox, river, 176 mi (283 km) long, rising in S central Wis. and flowing SW to within 1.5 mi (2.4 km) of Portage, Wis., on the Wisconsin River, then NE through Lake Winnebago into Green…
(Encyclopedia) jade, common name for either of two minerals used as gems. The rarer variety of jade is jadeite, a sodium aluminum silicate, NaAl(SiO3)2, usually white or green in color; the green…
(Encyclopedia) bowls, ancient sport (the bocce of Caesar's Rome is still played by Italians), especially popular in Great Britain and Australia, known as lawn bowls or bowling on the green in the…
