(Encyclopedia) apatiteapatiteăpˈətīt [key], mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and…
(Encyclopedia) Walker, Kara Elizabeth,1969–, American artist, b. Stockton, Calif., grad. Atlanta College of Art (B.F.A., 1981), Rhode Island School of Design (M.F.A., 1994). Walker is best known for…
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z More Biographies Don't see the biography you're looking for? Search 30,000+ biographies Biographies…
(Encyclopedia) flame test, test used in the identification of certain metals. It is based on the observation that light emitted by any element gives a unique spectrum when passed through a…
(Encyclopedia) Lambeau, Earl Louis, 1898–1965, American football coach and player, b. Green Bay, Wis. “Curly” Lambeau briefly attended Notre Dame, where he played for Knute Rockne, but illness forced…
(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…
