单词 | fluorite |
例句 | The knuckles of my right hand jammed against something I hadn’t remembered was there: a jagged piece of bright-purple fluorite that I’d nicked from the Earth Science room during mineral lab. The Miseducation of Cameron Post 2012-02-07T00:00:00Z I decided that piece of fluorite would look nice, would even look right, somehow, hanging above the fireplace in the room I thought of as the library. The Miseducation of Cameron Post 2012-02-07T00:00:00Z Earlier, it had been the music from James Bond as he mixed fluorite, gypsum and talcum. The great Moon-rock heist - extract 2011-07-08T21:59:00Z His eyes are bloodstones, those green gems sprinkled with red jasper, less shiny than the fluorite crystals embedded in our children’s faces, but no less spectacular. Sins of the mother: I blame myself for my son's overdose 2019-02-01T05:00:00Z He said the five most sought-after varieties included tourmaline, aquamarine, crystallized gold, fluorite and rhodochrosite. Chemical Compounds That Incite Oohs and Aahs 2022-06-24T04:00:00Z Two hunks of polished green fluorite, a mineral popular in the world of healing crystals, sit on chained steel trolleys. New York Galleries: What to See Right Now 2019-10-09T04:00:00Z One result is the fluorspar district of southern Illinois, which once produced a majority of the country’s fluorite—used to smelt steel and create hydrofluoric acid. Major U.S. geological survey aims to uncover minerals critical for batteries and microchips 2023-06-01T04:00:00Z Deposits of fluorite are formed through a process called hydrothermal precipitation in which calcium and fluoride ions dissolved in groundwater combine to produce insoluble CaF2 in response to some change in solution conditions. Chemistry 2019-02-14T00:00:00Z For example apatite is about three times harder than fluorite and diamond is three times harder than corundum. Physical Geology 2015-01-01T00:00:00Z It is obviously gigantic, but Nikon says the use of a magnesium alloy and a fluorite lens element help keep the weight and balance under control. Nikon announces colossal $12,399 super-telephoto lens with built-in teleconverter 2018-01-08T05:00:00Z The residual impurity at any stage could be estimated by interposing a thin plate of quartz or fluorite which completely reflected or absorbed the residual rays, but allowed the impurity to pass. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Many of these granites contain tourmaline, fluorite and monazite. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z For example, a decrease in temperature may trigger fluorite precipitation if its solubility is exceeded at the lower temperature. Chemistry 2019-02-14T00:00:00Z In the case of fluorite, only China rivals its output. Analysis: Mexichem profits to surge on global M&A payoff 2010-10-08T16:23:00Z Other minerals extracted include salt, kaolin, chalk, talc, asbestos, gypsum, mica, fluorite, quartzite, antimony, lime, sandstone, slate, and pyrites. Area Handbook for Bulgaria In England, fluorite is obtained in this manner as a by-product from lead and zinc mines. The Economic Aspect of Geology The experiment was performed in a platinum U tube, closed by stoppers of fluorite, and having at the upper part of each branch a small delivery tube, also of platinum. Scientific American Supplement, No. 561, October 2, 1886 Because fluoride ion is a weak base, its solubility is also affected by solution pH, and so geologic or other processes that change groundwater pH will also affect the precipitation of fluorite. Chemistry 2019-02-14T00:00:00Z It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. The Gutenberg Webster's Unabridged Dictionary Section F, G and H How Minerals Got Their Names Names of most minerals end in "ite"—apatite, calcite, dolomite, fluorite. Let's Collect Rocks and Shells Fluorspar is the trade name for the mineral fluorite, which is composed of calcium fluoride. The Economic Aspect of Geology The large fluorspar deposits of Illinois and Kentucky contain fluorite with calcite, barite, and metallic sulphides, in wide veins filling fissures in limestones and sandstones and replacing the fissure walls. The Economic Aspect of Geology In the western United States many metalliferous deposits carry large amounts of fluorite, which is treated as a gangue or waste mineral, but which could be profitably extracted if there were local markets. The Economic Aspect of Geology The gangue is usually quartz, containing smaller amounts of a number of less common minerals—including lithium mica, fluorite, topaz, tourmaline, and apatite. The Economic Aspect of Geology |
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