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apatite

(Encyclopedia) apatite ăp´ətīt [key], mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white,…

Kirovsk

(Encyclopedia) Kirovsk kē´rəfsk [key], city (1989 pop. 43,500), N European Russia, on the Kola Peninsula. The city is the center of a mining complex that produces apatite and nephelite…

Auburn

(Encyclopedia) Auburn ô´bərn [key]. 1 City (1990 pop. 33,830), Lee co., E Ala.; inc. 1839. The city's economy centers around Auburn Univ. ; there is some…

hardness

(Encyclopedia) hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different…

Calcium (Element)

(Encyclopedia) calcium kăl´sēəm [key] [Lat.,=lime], metallic chemical element; symbol Ca; at. no. 20; at. wt. 40.078; m.p. about 839°C; b.p. 1,484°C; sp. gr. 1.55 at 20°C; valence +2.…

Fluorine (Element)

(Encyclopedia) fluorine flo͞o´ərēn, –rĭn [key], gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C; b.p. −188.14°C; density 1.696 grams per liter at STP;…

Murmansk

(Encyclopedia) Murmansk mo͝ormänsk´ [key], city (1989 pop. 468,000), capital of Murmansk region, NW European Russia, on the Kola Gulf of the Barents Sea. It is the terminus of the…

Phosphorus (Element)

(Encyclopedia) phosphorus fŏs´fərəs [key] [Gr.,=light-bearing], nonmetallic chemical element; symbol P; at. no. 15; at. wt. 30.97376; m.p. 44.1°C; b.p. about 280°C; sp. gr. 1.82 at 20°…

Lapland

(Encyclopedia) Lapland lăp´lănd˝ [key], Finn. Lappi, Nor. Lapland, Swed. Lappland, vast region of N Europe, largely within the Arctic Circle. It includes the…