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Verneuil method

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  • verneuil method — noun see verneuil process …   Useful english dictionary

  • verneuil process — noun or verneuil method (ˈ)ver|nər , nə̄ē, F vernœœy Etymology: after A. V. L. Verneuil, 19th century French mineralogist : a procedure for growing large crystals (as of sapphire, ruby, spinel, or rutile) by adding the powdered material to the… …   Useful english dictionary

  • Verneuil process — The Verneuil process, also called flame fusion, was the first commercially successful method of manufacturing synthetic gemstones, developed in 1902 by the French chemist Auguste Verneuil. It is primarily used to produce the ruby and sapphire… …   Wikipedia

  • Verneuil process — /verr noy /; Fr. /verdd nue yeu/ a process for making synthetic rubies, sapphires, spinels, etc., by the fusion at high temperatures of powdered compounds. Also called flame fusion process. [named after A.V.L. Verneuil, 19th century French… …   Universalium

  • Flux method — is a method of crystal growth where the components of the desired substance are dissolved in a solvent (flux) and growth takes place at relatively low temperatures. The method is particularly suitable for crystals needing to be free from thermal… …   Wikipedia

  • Beryllium oxide — Preferred IUPAC name Beryllium oxide[ …   Wikipedia

  • Sapphire — For other uses, see Sapphire (disambiguation). Sapphire The 423 carat (85 g) blue Logan sapphire General Category Oxide mineral …   Wikipedia

  • geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium

  • Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …   Wikipedia

  • Hydrothermal synthesis — includes the various techniques of crystallizing substances from high temperature aqueous solutions at high vapor pressures; also termed hydrothermal method . The term hydrothermal is of geologic origin. Geochemists and mineralogists have studied …   Wikipedia

  • Timeline of materials technology — BC= * 29,000–25,000 BC First ceramic appears *3rd millennium BC Copper metallurgy is invented and copper is used for ornamentation *2nd millennium BC Bronze is used for weapons and armour *1st millennium BC Pewter beginning to be used in China… …   Wikipedia

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