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Mohs scratch hardness number

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  • Mohs , Friedrich — (1773–1839) German mineralogist Mohs was born at Gernrode in Saxony and studied at Halle and at the Freiberg Mining Academy under Abraham Werner. In 1812 he became curator of the mineral collection at the Johanneum in Graz. He succeeded Werner at …   Scientists

  • Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …   Wikipedia

  • diamond — diamondlike, adj. /duy meuhnd, duy euh /, n. 1. a pure or nearly pure, extremely hard form of carbon, naturally crystallized in the isometric system. 2. a piece of this stone. 3. a transparent, flawless or almost flawless piece of this stone, esp …   Universalium

  • Diamond — /duy meuhnd, duy euh /, n. 1. Neil, born 1941, U.S. singer and songwriter. 2. Cape, a hill in Canada, in S Quebec, on the St. Lawrence River. * * * I Mineral composed of pure carbon, the hardest naturally occurring substance known and a valuable… …   Universalium

  • Operational definition — The operational definition of a peanut butter sandwich might be simply the result of putting peanut butter on a slice of bread with a butter knife and laying a second equally sized slice of bread on top An operational definition defines something …   Wikipedia

  • Rutile — Wine red rutile crystals from Binn Valley, Switzerland (Size: 2.0 x 1.6 x 0.8 cm) General Category Oxide minerals …   Wikipedia

  • 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

  • geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …   Universalium

  • abrasive — abrasively, adv. abrasiveness, n. /euh bray siv, ziv/, n. 1. any material or substance used for grinding, polishing, etc., as emery, pumice, or sandpaper. adj. 2. tending to abrade; causing abrasion; abrading. 3. tending to annoy or cause ill… …   Universalium

  • Boron — (pronEng|ˈbɔərɒn) is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element on… …   Wikipedia

  • Mineral — For other uses, see Mineral (disambiguation). An assortment of minerals. A mineral is a naturally occurring …   Wikipedia

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