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topaz
to·paz T0269100 (tō′păz′) n. 1. a. A colorless, blue, yellow, brown, or pink aluminum silicate mineral, often found in association with granitic rocks and valued as a gemstone. b. Any of various yellow gemstones, especially a yellow variety of sapphire or corundum. 2. A light yellow variety of quartz.
[Middle English topace, from Old French, from Latin topazus, a precious green stone, from Greek topazos, topazion, a precious green stone such as peridot or chrysolite, perhaps after Topazios, ancient name (said by Pliny the Elder to mean "to be sought" in the local Troglodyte language, since sailors would use it as a landmark) of Zabargad or St. John's Island, an island in the Red Sea off the coast of Egypt formed of rocks rich in peridot.] topaz (ˈtəʊpæz) n1. (Minerals) a white or colourless mineral often tinted by impurities, found in cavities in igneous rocks and in quartz veins. It is used as a gemstone. Composition: hydrated aluminium silicate. Formula: Al2SiO4(F,OH)2. Crystal structure: orthorhombic2. (Minerals) oriental topaz a yellowish-brown variety of sapphire3. (Minerals) false topaz another name for citrine4. (Colours) a. a yellowish-brown colour, as in some varieties of topazb. (as adjective): topaz eyes. 5. (Animals) either of two South American hummingbirds, Topaza pyra and T. pella[C13: from Old French topaze, from Latin topazus, from Greek topazos]to•paz (ˈtoʊ pæz)
n. 1. a mineral, Al2(SiO4)(OH,F)2, occurring in transparent crystal prisms and granular masses and used as a gem. 2. citrine (def. 2). [1225–75; Middle English topace < Old French < Latin topazus < Greek tópazos] to′paz•ine` (-pəˌzin, -zɪn) adj. to·paz (tō′păz′)1. A colorless, blue, yellow, brown, or pink mineral consisting largely of aluminum silicate and valued as a gem. Topaz is often found in pegmatites and is the mineral used to represent a hardness of 8 on the Mohs scale.2. Any of various yellow gemstones, especially a yellow variety of sapphire or corundum.Thesaurus| Noun | 1. |  topaz - a yellow quartz common topaz, false topazquartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities | | 2. |  topaz - a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstonemineral - solid homogeneous inorganic substances occurring in nature having a definite chemical compositiontransparent gem - a gemstone having the property of transmitting light without serious diffusion | | 3. |  topaz - a light brown the color of topaz tanlight brown - a brown that is light but unsaturated |
Translationstopaz (ˈtəupaz) noun a kind of precious stone, of various colours. 黃晶，黃玉 黄晶，黄玉 topaz
topaz (tō`păz), aluminum silicate mineral with either hydroxyl radicals or fluorine, Al2SiO4(F,OH)2, used as a gem. It is commonly colorless or some shade of pale yellow to wine-yellow; pale blue and pale green also occur, but natural red stones are uncommon. Some natural yellow stones lose their yellow coloring when heated and become permanently pink ("pinked" topaz). The stone is transparent with a vitreous luster. It has perfect cleavage on the basal pinacoid, but it is nevertheless hard and durable. The brilliant cut is commonly used. Topaz crystals, which are of the orthorhombic system, occur in highly acid igneous rocks, e.g., granites and rhyolites, and in metamorphic rocks, e.g., gneisses and schists. Important sources of topaz are in Russia, Siberia, Brazil, Australia, and Mexico and in New Hampshire, Colorado, and Utah in the United States. The name topaz is commonly but incorrectly used for various other yellow stones, e.g., for citrine quartzquartz,
one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2.
..... Click the link for more information. .Topaz a silicate mineral of the nesosilicate class with the chemical composition Al2[SiO4l (OH, F)2. The contents of OH– and F– vary, and the ions Fe3+, Cr3+, Ti3+, and V4+ may replace aluminum. Topaz crystallizes in the orthorhombic system, usually forming prismatic crystals with perfect basal cleavage. The mineral’s structure is based on a four-layered arrangement of densely packed oxygen and fluorine atoms and OH– groups; Al atoms are located in the octahedral interstices, and Si atoms in the tetrahedral interstices. The distribution of fluorine and of OH– groups in the structure may or may not be ordered, a situation affecting the mineral’s optical constants. Topaz may be yellow, green, pale blue, or pink; colorless varieties are also encountered. Under the action of ionizing radiation (gamma radiation, X-radiation), the mineral acquires a smoky, dark yellow, or red color owing to the formation of structural defects. Topaz has a hardness of 8 on Mohs’ scale and a density of 3,400–3,640 kg/m3. Topaz is found in granitic pegmatites and pneumatolytic deposits in association with feldspar, quartz, tourmaline, beryl, and micas. Transparent colorless and beautifully colored crystals of topaz are gems. Topaz rocks (greisens) are used as a refractory material. Deposits of topaz, which can be faceted, exist in the Ukraine (Volyn’), the Ural Mountains, and Transbaikalia and, outside the Soviet Union, in Brazil, Japan, and Madagascar. L. V. BERSHOV topaz[′tō‚paz] (mineralogy) Al2SiO4(F,OH) A red, yellow, green, blue, or brown neosilicate mineral that crystallizes in the orthorhombic system and commonly occurs in prismatic crystals with pyramidal terminations; hardness is 8 on Mohs scale, and specific gravity is 3.4-3.6; used as a gemstone. topazNovember. [Am. Gem Symbolism: Kunz, 319–320]See: Birthstonestopaz1. a white or colourless mineral often tinted by impurities, found in cavities in igneous rocks and in quartz veins. It is used as a gemstone. Composition: hydrated aluminium silicate. Formula: Al2SiO4(F,OH)2. Crystal structure: orthorhombic 2. oriental topaz a yellowish-brown variety of sapphire 3. false topaz another name for citrine4. a yellowish-brown colour, as in some varieties of topaz 5. either of two South American hummingbirds, Topaza pyra and T. pella TOPAZ
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topaz
Related to topaz: opalSynonyms for topaznoun a yellow quartzSynonymsRelated Wordsnoun a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstoneRelated Wordsnoun a light brown the color of topazSynonymsRelated Words |