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zircon Definitions

noun

a crystal of zircon, sometimes used as a false gemstone.

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  • zirconium is a fairly abundant element and is widely distributed in minerals, but it is never found uncombined in nature. it always occurs with hafnium, which has almost identical chemical properties. the chief ore is zircon (the silicate); baddeleyite (the oxide) also has some importance. zircon is recovered (along with monazite, ilmenite, and rutile) from certain beach sands in new south wales, australia, and near jacksonville, fla. the metal is produced by the kroll process. the zircon is treated with carbon in an electric furnace to form a cyanonitride, which is in turn treated with chlorine gas to form the volatile tetrachloride. the tetrachloride is carefully purified by sublimation in an inert atmosphere and is then chemically reduced to metal sponge by reaction with molten magnesium. the spongy metal is cleaned and further processed into ingots. factmonster.com

  • zirconium is a fairly abundant element and is widely distributed in minerals, but it is never found uncombined in nature. it always occurs with hafnium, which has almost identical chemical properties. the chief ore is zircon (the silicate); baddeleyite (the oxide) also has some importance. zircon is recovered (along with monazite, ilmenite, and rutile) from certain beach sands in new south wales, australia, and near jacksonville, fla. the metal is produced by the kroll process. the zircon is treated with carbon in an electric furnace to form a cyanonitride, which is in turn treated with chlorine gas to form the volatile tetrachloride. the tetrachloride is carefully purified by sublimation in an inert atmosphere and is then chemically reduced to metal sponge by reaction with molten magnesium. the spongy metal is cleaned and further processed into ingots. infoplease.com

  • dandruff: a scalp condition that produces white flakes that may be shed and fall from the hair. one cause of dandruff is overworking of the sebaceous glands. another cause of dandruff is fungus, especially an abundance of the fungus pitrosporum ovale. if several weeks of using a good-quality shampoo does not stop the dandruff, treatment options include an antifungal shampoo such as denorex, dhs targel, ionil-t plus, mg217, neutrogena t/gel, scalpicin, sebulex, selsun blue, tegrin, or zircon. the active ingredients approved for dandruff treatment by the us food and drug administration (fda) include tar, pyrithione zinc, salicylic acid, selenium sulfide, sulfur, and ketoconazole. medicinenet.com

  • life, then, appears to have been present when the oldest well-preserved sedimentary rocks were deposited (fig. 1). how much earlier life might have evolved remains conjectural. reduced carbon (graphite) in ancient metaturbidites from southwestern greenland has a c-isotopic composition, consistent with autotrophy (24), and recently, upwardly convex, laminated structures interpreted (not without controversy) as microbialites have been reported as well (25); the age of these rocks is constrained by cross-cutting intrusions that cluster tightly around 3710 ma (25). a still earlier origin for biological carbon fixation is suggested by a 13c-depleted organic inclusion in a zircon dated at 4100 ± 10 ma (26), although it is hard to rule out abiological fractionation in this minute sample of earth’s early interior. nih.gov