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chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… … Universalium
mineral deposit — Introduction aggregate of a mineral in an unusually high concentration. About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… … Universalium
beryl — beryline /ber euh lin, luyn /, adj. /ber euhl/, n. a mineral, beryllium aluminum silicate, Be3Al2Si6O18, usually green, but also blue, rose, white, and golden, and both opaque and transparent, the latter variety including the gems emerald and… … Universalium
Pegmatite — is a very coarse grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic .Most pegmatites are composed of quartz, feldspar and mica; in essence a granite . Rarer intermediate and mafic pegmatite… … Wikipedia
Beryl — /ber il/, n. a female given name. * * * Mineral composed of beryllium aluminum silicate, Be3Al2(SiO3)6, a commercial source of beryllium. Several varieties are valued as gemstones: aquamarine (pale blue green); emerald (deep green); heliodor… … Universalium
Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table … Wikipedia
pegmatite — pegmatitic /peg meuh tit ik/, adj. /peg meuh tuyt /, n. Petrol. a coarsely crystalline granite or other high silica rock occurring in veins or dikes. [1825 35; < Gk pegmat (s. of pêgma) anything fastened together, a bond (Compare pegnýein to… … Universalium
Chrysoberyl — General Category Oxide minerals Spinel group Chemical formula Be … Wikipedia
Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
chemical atomic weights — Element El e*ment, n. [F. [ e]l[ e]ment, L. elementum.] 1. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based. [1913 Webster] 2. One of the… … The Collaborative International Dictionary of English
Cuprum — Element El e*ment, n. [F. [ e]l[ e]ment, L. elementum.] 1. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based. [1913 Webster] 2. One of the… … The Collaborative International Dictionary of English