A detailed study of the florencite and xenotime assemblage from quartz veins of Au-REE occurrences in the Subpolar Urals allowed the REE fractionation and distribution of REE mixtures in the crystal structure to be characterized. In minerals of selective composition, isomorphic mixtures of LREE and HREE are divided into lanthanum Lasg …
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Formula: Yb (PO4) Colour: Colourless to yellow, light brown. Lustre: Vitreous. Specific Gravity: 5.85 (Calculated) Crystal System: Tetragonal. Member of: Xenotime Group. …
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First, it has recently been recognized that trace elements in metamorphic rocks, and especially trace element zoning in garnet and other major phases, contain considerable detailed information ...
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Xenotime- (Y) crystals occur in dislocated domains of the rim (Fig. 5 c), in pores, and as larger crystals with approximately 10 µm (longest diameter) in the rim or as outgrowths …
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A xenotime flotation concentrate prepared from Sarabit El Khadem ferruginous sandstone of Southwestern Sinai (55.4% RE2O3 and 0.9% U3O8) is subjected to processing via alkali fusion using NaOH ...
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Monazite-xenotime thermometry indicates conditions of ~700 °C at 1748 ± 9 Ma and ~650 °C at 1679 ± 11 Ma. Low-Y monazite domains suggest conditions of ~1.0 GPa at ~800 °C at 1650 ± 40 Ma. Monazite-xenotime thermometry records cooling through ~540 °C at 1570 ± 36 Ma.
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Diagenetic xenotime is common in siliciclastic sedimentary rocks, where it starts to form on detrital zircon shortly after sediment deposition. It is possible to …
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Xenotime-(Y) and monazite are common accessory phosphates that control the rare earth element (REE) budget in many rocks. Whereas monazite preferentially incorporates the light REE (LREE) from La to Gd, the xenotime incorporates the heavy REE (HREE) from Tb to Lu (Ni et al. 1995).For monazite, the REE patterns are steep with a negative slope …
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A geochronological study of the Chocolay Group at the base of the Paleoproterozoic Marquette Range Supergroup in Michigan, Lake Superior Region, is attempted for the first time, Age data from detrital zircon grains and hydrothermal xenotime from the basal glaciogenic formation, the Enchantment Lake Formation, and the …
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Orthophosphate compounds of the type A(PO 4) include the minerals monazite [RE(PO 4) with RE = the light rare-earth ions, e.g., La, Ce, Nd…], xenotime [Y(PO 4), and also incorporating the heavy RE ions], and pretulite [Sc(PO 4)].The name of the mineral monazite is derived from the Greek word monazein, "to be solitary," whereas …
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Xenotime describes a group of several closely related phosphates, arsenates, and vanadates composed of rare earth elements. The term is generally used to describe the …
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Discover Gem Rock Auctions collection of authentic Xenotime through our online marketplace. Buy loose Xenotime in a variety of colors and sizes now or place a bid on your favorite gem. ... Acquiring Xenotime specimens demands a discerning eye and informed choices. Commence by assessing the color - Xenotime is typically brown, …
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This study investigates the paragenesis and ore mineral composition of xenotime [(Y,HREE)PO4] and florencite [LREEAl3(PO4)2(OH)6] from heavy rare earth element (HREE) deposits/prospects of the Tanami and Hall Creek regions of Western Australia. Two stages of xenotime-(Y) formation are recognized: (1) early xenotime-(Y) …
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Hydrothermal xenotime was found and concluded to be younger than the surrounding host rock within a 200-kilometer radius of the initial source [45] . Upon further investigation, it was
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Xenotime sample z6413 (also referred to as XENO-1) comes from a granitic pegmatite from the Mesoproterozoic Grenville province of Ontario, Canada (Stern and Rayner, 2003) (Fig. 1).This sample is commonly used as a reference material for U Pb analyses of high-U xenotime (Fletcher et al., 2004).The pegmatite is located in the ∼1.6 …
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Petrographic studies indicate that xenotime precipitated after significant compaction of the host rocks and was coeval with the main phase of tourmaline and drusy quartz. ... The similarities in wall-rock alteration, paragenesis, mineralization age, oxygen isotopes, and fluid inclusion attributes between the Maw zone rare earth element deposit ...
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A truly singular Xenotime, remarkable and attractive! It is a small miniature, and has a lot of impact on a shelf. Share. Shop More Minerals. Xenotime-(Y) Novo Horizonte, Bahia, Brazil. Miniature, 4.6 x 1.1 x 0.9 cm. Xenotime-(Y) Novo Horizonte, Bahia, Brazil ... for the 2023 Hard Rock Summit show in Downtown Denver, opening September 15, and ...
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Introduction. Xenotime (YPO 4) is a trace mineral in many rock types (Rasmussen, 2005).Its significance far outweighs its low abundance and small grain size for two main reasons: 1) it forms in many common rock types from a range of high- to low-temperature processes, and 2) it is an excellent mineral for U/Pb geochronology, …
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a7730c6f-ee64-4c91-8fc1-82035a91ce2d (as Hussakite) 2149c98d-72c9-4d76-a5d6-c4b32f715f23 (as Xenotime-(Y))
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Geological map of Western AustraliaNorthern Territory border area (after Dunster and Ahmad, 2013), showing Browns Range heavy rare earth element (HREE) deposits, including Wolverine deposit on ...
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Diagenetic xenotime occurs in a wide variety of rock types, including conglomerate, sandstone, siltstone, shale, phosphorite and volcaniclastic rocks, varying from early Archaean to Mesozoic in age. The formation of diagenetic xenotime is principally related to redox cycling of Fe-oxyhydroxides and microbial decomposition of organic …
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In eleven Alpine clefts of the western Alps, in-situ dating of monazite-(Ce) and xenotime-(Y) has been attempted to gain insights on possible disturbances of the geochronological U-Th-Pb systems and age interpretations in hydrothermal conditions. In most clefts, monazite-(Ce) in-situ 208Pb/232Th dating using laser ablation-inductively …
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Monazite and xenotime, the RE(PO 4) dimorphs, are the most ubiquitous rare earth (RE) minerals, yet accurate structure studies of the natural phases have not been reported.Here we report the results of high-precision structure studies of both the natural phases and the synthetic RE(PO 4) phases for all individual stable rare earth elements.. …
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Xenotime (YPO 4) is a heavy rare earth element (HREE) phosphate, the principal host to economic HREE mineralization and a common accessory mineral in igneous, metamorphic and sedimentary rocks.Many occurrences of xenotime-(Y) are of hydrothermal origin, and therefore, determination of its solubility in aqueous fluids may …
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Remarkably, only three are common in metamorphic rocks: apatite, monazite, and xenotime, and this chapter is restricted to discussion of these minerals. Apatite, monazite, and, to a lesser extent, xenotime, have enjoyed intensive study during the previous half-century. Following World War II, considerable study was made of minerals …
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A mineral containing tell-tale 'shock' fractures could help scientists study meteorite impact sites, a paper published in Geology suggests. A team of Australian and …
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Xenotime grows in many rock types, and can be linked via composition and textures to major rock-forming silicates and subsequently to the geologic processes …
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Xenotime-(Y) from the Nine Mile Pluton near Wausau in Marathon County, Wisconsin. Scanning electron microscope image. (Photo by Al Falster.) Xenotime-(Y) is a rare accessory mineral generally found in complex …
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Xenotime (Xenotime). Often found with Zircon, xenotime is a term used to describe a group of earthy minerals, but it's mostly used as the name for the most common member of the group,, Xenotime-(Y). This mineral is a source of yttrium, a chemical element used to make lasers. Xenotime may contain certain radioactive elements, therefore it can have …
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Xenotime (YPO 4) is a heavy rare earth element (HREE) phosphate, the principal host to economic HREE mineralization and a common accessory mineral in …
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The analysis results shows that the monazite, xenotime and zircon have high content of uranium and thorium, whereas ilmenite, rutile, pyrite and waste have lower concentration compare with raw materials after tailing process. The highest values of uranium and thorium concentrations (4053 ± 428 ppm and 33578 ± 873 ppm, …
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General Xenotime-(Y) Information : Chemical Formula: YPO4 : Composition: Molecular Weight = 183.88 gm ... Rock and Mineral Shows Google Search for Xenotime-(Y) Weinrich Minerals, Inc. Google Search for Xenotime-(Y) Ask about Xenotime-(Y) here : Ask-A-Mineralogist from the Mineralogical Society of America
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An examination of xenotime from a range of rock types indicates that it is an excellent mineral for U-Pb geochronology. Xenotime has low initial amounts of Pb, high U contents [typically ∼1000 parts per million (ppm) for diagenetic crystals and >10,000 ppm for some pegmatitic crystals], and an exceptional ability to remain closed to U and Pb ...
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