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opal

(Encyclopedia) opal ō´pəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO 2· n H 2O; the water content is quite variable but usually ranges from 3% to…

Brewer's: O'pal

From the Greek ops (the eye). Considered unlucky for the same reason that peacocks' feathers in a house are said to be unlucky. A peacock's feather, being full of eyes, act as spies in a…

Brewer's: Opal of Alphonso XII

(of Spain) seemed to be fatal. The king, on his wedding day, presented an opal ring to his wife (Mercedes, daughter of the Duke of Montpensier), but her death occurred soon afterwards.…

(Opal) Shagg Courtney 2001 Deaths

(Opal) Shagg CourtneyAge: 89 Harlem Globetrotter credited with inventing one of the teams most popular tricks; played three seasons starting in 1934; created the move of spinning the ball on…

fluorite

(Encyclopedia) fluorite flo͞o´ərīt [key] or fluorspar flo͞o´ərspär [key], mineral appearing in various colors, e.g., green, yellow-brown, rose, and red. Chemically, it is…

agate

(Encyclopedia) agate ăg´ĭt [key], translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony . Agates are identical in chemical structure to jasper,…

Querétaro de Arteaga

(Encyclopedia) Querétaro de Arteaga kārā´tärō ᵺā ärtā-ä´gä [key], state (1990 pop. 1,061,236), 4,432 sq mi (11,479 sq km), central Mexico. The city of Querétaro is the capital.…

Guanajuato

(Encyclopedia) Guanajuato gwänähwä´tō [key], state (1990 pop. 3,982,593), 11,805 sq mi (30,575 sq km), W central Mexico, on the central plateau. The city of Guanajuato is the…

silica

(Encyclopedia) silica or silicon dioxide, chemical compound, SiO 2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica…

month

(Encyclopedia) month, in chronology, the conventional period of a lunation, i.e., passage of the moon through all its phases. It is usually computed at approximately 29 or 30 days. For…