Xenotime


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xenotime

[′zēn·ə‚tīm]
(mineralogy)
Y(PO4) A tetragonal mineral of varying color, consisting of yttrium phosphate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Xenotime

 

a mineral; yttrium phosphate, YPO4 (V2O3 ~ 63.1 percent). Xenotime always contains rare earths, sometimes ThO2, UO2 (up to 5 percent), ZrO2 (up to 3 percent), and others. It crystallizes in the tetragonal system, forming pyramidal or prismatic crystals; it is isostructural with zircon. Xenotime is light brown or reddish brown in color. It has a hardness of 4–5 on the mineralogical scale and a density of 4,450-4,590 kg/ m3. It occurs in granites and pegmatites in the form of granules or crystals ingrown into feldspar or quartz; it also occurs in alluvial deposits. Xenotime is closely associated with monazite and zircon.

The best-known deposits of xenotime are the pegmatite and alluvial deposits of Brazil (Minas Geraes) and the pegmatites of Norway (Hitterö, near Arendal, and Kragerö in Telemark) and Sweden (Ytterby). In the USSR, xenotime is found in the pegmatites of Karelia.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
- Xenotime mineralogy offers potential for simple mineral processing route (see TUC ASX Announcement 14th September 2011).
Baotite is tetragonal, but the crystals are commonly so deformed as to appear monoclinic, very different in appearance from the beautifully formed crystals of xenotime, which is also tetragonal.
Honey-yellow to brown, translucent crystals of xenotime to several millimeters have been found in the hanging wall of the talc structure.
Petrology studies on rock chip samples from the area confirm the presence of xenotime within quartz veins.
18b), apatite, monazite, and xenotime, which are mostly hosted by biotite; and garnet, which occurs as inclusions in plagioclase.
Rasmussen, "Early-diagenetic REE-phosphate minerals (florencite, gorceixite, crandallite, and xenotime) in marine sandstones: a major sink for oceanic phosphorus," American Journal of Science, vol.
- Xenotime hosted mineralisation remains open in both cross section and strike.
Preliminary elemental/mineralogic analyses of certain formations indicate a monazite grade range of 0.8 to 2.1%, and a xenotime grade range of 0 to 0.5%.
Mineralogical work completed by the company indicated that a wide variety of rare-earth element-bearing minerals have been identified, including apatite, iimoriite, kainosite, gadolinite, allanite, bastnaesite, parisite, brannerite, thalenite, xenotime, fergusonite, synchysite (Y), and monazite.