词汇 | monazite |
释义 | BETA Examples of monazitemonazite isn’t in the Cambridge Dictionary yet. You can help! Zircon, monazite, apatite, ilmenite and rutile are the common accessory phases. These stocks of monazite sand, whatever they may do, do not prove that the cause of the trouble is depreciated exchange. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The name is due to the darker color of the sand, with large amounts of monazite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thorium occurs in several minerals, the most common being the rare earth-thorium-phosphate mineral, monazite, which contains up to about 12% thorium oxide. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Both zircon and monazite are abundant in the rock. The samples were crushed and zircons and monazites retrieved from the powders. Accessory minerals include titanite, zircon, monazite, apatite, molybdenite and sulphide phases (pyrite/chalcopyrite). The results indicate that at least on a short-term scale (1-3 days), the monazite-rich sands do not cause any obvious increases in mutation. Contrasted monazite alteration mechanisms and their geochemical implications. Both zircons and monazites were then cleaned thoroughly with dilute nitric acid, followed by ionized water and acetone rinses. Accessory minerals include zircon, monazite, xenotime, thorite and apatite. Thorium usually occurs in sediments as the phosphate, monazite or in zircon. Parnell (2004) has detailed a scenario whereby this could happen, involving the accumulation of radioactive minerals, particularly monazite, in sands. Monazite was not detected as an inclusion in garnet. The organic material includes migrated hydrocarbons and carbon-rich shale fragments, but is also concentrated in aggregates (nodules) together with uranium/thorium-rich radioactive minerals (including uraninite, monazite). Zircon (100-250 m) and monazite (up to 300 m) occur mostly as inclusions within garnet and cordierite. Biotite shows euhedral crystal outlines, reaches up to 1.5 mm in diameter and contains a few apatite microlites besides abundant inclusions of zircon and monazite with dark brown pleochroic haloes. Monazite alteration contributes to phosphorus availability. |
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