| 单词 | monazite |
| 例句 | The researchers determined the crater’s age by examining tiny crystals of the minerals monazite and zircon formed in the asteroid impact. Did asteroid that hit Australia help thaw ancient 'snowball Earth'? 2020-01-23T05:00:00Z The scientists were able to determine the age of the impact crater, which is not visible to the eye, by testing the minerals zircon and monazite that were "shock recrystallized." Earth's oldest asteroid strike may have ended 'Snowball Earth' 2020-01-22T05:00:00Z The scientists were looking for grains of zircon and monazite, tough minerals that survive for billions of years and, crucially, incorporate uranium and thorium atoms into their crystalline structure. Earth’s Oldest Asteroid Impact Found in Australia 2020-01-21T05:00:00Z Geologists date events using “isotopic clocks” in minerals like zircon and monazite. The world’s oldest asteroid strike in Western Australia may have triggered a global thaw 2020-01-21T05:00:00Z To determine when the asteroid hit Earth, the team examined tiny zircon and monazite crystals in the rocks. Earth's oldest asteroid crater found in Australia 2020-01-21T05:00:00Z Another was "lucium", a substance found in 1896 in a reddish-brown mineral called monazite, which turned out to be an impure sample of a rare earth element, yttrium. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z The property is the former home of the defunct Wolff-Alport Chemical Company, which until 1954 extracted rare earth minerals from monazite sand, with the radioactive element thorium as a byproduct. Superfund Site Is Designated in Queens 2014-05-08T21:16:40Z Based on measurements of 39 zircon and monazite crystals, Dr. Erickson and his team calculated that the Yarrabubba impact occurred 2.229 billion years ago, with an uncertainty of 5 million years. Earth’s Oldest Asteroid Impact Found in Australia 2020-01-21T05:00:00Z The JV plans to extract about 40,000 tonnes of rare earths from the monazite concentrate stored in the warehouses over the course of seven or eight years starting from 2015, the companies said. Russia to invest $1 billion in rare earths to cut dependence on China 2013-09-10T09:36:13Z De had trained in Germany with Hahn and Meitner in the 1920s and like Allison, used monazite sand for his research. A Tale of 7 Elements: Element 85 Astatine [Excerpt] 2013-07-05T14:15:00.623Z If thorianite cannot be obtained, monazite, which is more abundant, may be utilized. 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 World monazite resources are estimated to be about 12 million tons, two-thirds of which are in heavy mineral sands deposits on the south and east coasts of India. Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly. 2011-09-11T22:29:54Z The mineral monazite is the source of the thorium and cerium compounds which, glowing intensely when heated, form the light-giving material of incandescent gas mantles. The Economic Aspect of Geology These elements are found in a few rare minerals, especially in the monazite sand of the Carolinas and Brazil. An Elementary Study of Chemistry It also occurs as phosphate in monazite, and as fluoride in fluocerite. A Text-book of Assaying: For the Use of Those Connected with Mines. Since the monazite contains more cerium than thorium and the mantles made from it contain more thorium than cerium, there is a superfluity of cerium. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The most common source of thorium is the rare earth phosphate mineral, monazite. Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly. 2011-09-11T22:29:54Z The world's supply of monazite is obtained mainly from Brazilian and Indian properties. The Economic Aspect of Geology The content of thorium oxide varies from a trace up to 30 per cent, and commercial monazite sands are usually mixed so as to bring the grade up to at least 5 per cent. The Economic Aspect of Geology Yellowish-brown crystals of monazite have been found scattered through granites, gneisses, and pegmatites, but in quantities ordinarily too small to warrant mining. The Economic Aspect of Geology The chief sources of the material for the Welsbach burners is monazite, a glittering yellow sand composed of phosphate of cerium with some 5 per cent. of thorium. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The North and South Carolina monazite has been obtained chiefly from stream beds, and to a slight extent by mining and washing the rotted underlying rock, which is a pegmatized gneiss. The Economic Aspect of Geology The United States has a supply of domestic monazite of lower grade than the imports, but is dependent under normal conditions on supplies from Brazil and India. The Economic Aspect of Geology The recently developed deposits of Pablo Beach, Florida, may produce important amounts of titanium minerals along with the output of zircon and monazite. The Economic Aspect of Geology In 1916 the United States imported 2,500,000 pounds of monazite from Brazil and India, most of which used to go to Germany. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries |
| 随便看 |
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。