Columbia Encyclopedia
Search results
25 results found
emerald
(Encyclopedia)emerald, the green variety of beryl, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds. The emerald ...emerald flash
(Encyclopedia)emerald flash: see green flash. ...beryl
(Encyclopedia)beryl bĕrˈĭl [key], mineral, a silicate of beryllium and aluminum, Be3Al2Si6O18, extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, b...green flash
(Encyclopedia)green flash or emerald flash, a refractive phenomenon of the atmosphere where the top edge of the setting (or, less frequently, rising) sun will momentarily turn emerald green. The green color lasts f...Eugene
(Encyclopedia)Eugene, city (2020 pop. 176,654), seat of Lane co., W Oregon, on the Willamette River; inc. 1862. A processing and shipping center in a farming area, th...aquamarine
(Encyclopedia)aquamarine ăkˌwəmərēnˈ, äkˌ– [key] [Lat.,=seawater], transparent beryl with a blue or bluish-green color. Sources of the gems include Brazil, Siberia, the Union of Myanmar, Madagascar, and p...beryllium
(Encyclopedia)beryllium bərĭlˈēəm [key] [from beryl ], metallic chemical element; symbol Be; at. no. 4; at. wt. 9.01218; m.p. about 1,278℃; b.p. 2,970℃ (estimated); sp. gr. 1.85 at 20℃; valence +2. Ber...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 ...Ischia
(Encyclopedia)Ischia ēsˈkyä [key], volcanic island, 18 sq mi (47 sq km), Campania, S Italy, in the Tyrrh...Stiegel, Henry William
(Encyclopedia)Stiegel, Henry William stēˈgəl [key], 1729–85, American iron and glass manufacturer, b. Germany. He emigrated to America, arriving in Philadelphia (1750). In 1758 he purchased his father-in-law's...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
- Places +-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
