FLUORINE-RICH XENOTIME from the WORLD-CLASS MADEIRA Nb–Ta–Sn DEPOSIT ASSOCIATED with the ALBITE-ENRICHED GRANITE at PITINGA, AMAZONIA, BRAZIL
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Synthesis of Magnesium- and Silicon-Modified Hydroxyapatites By
www.nature.com/scientificreports OPEN Synthesis of Magnesium- and Silicon-modifed Hydroxyapatites by Microwave-Assisted Method Received: 17 January 2019 Liudmila A. Rasskazova1, Ilya V. Zhuk1, Natalia M. Korotchenko1, Anton S. Brichkov1, Accepted: 19 September 2019 Yu-Wen Chen 2, Evgeniy A. Paukshtis1, Vladimir K. Ivanov1, Irina A. Kurzina 1 & Published: xx xx xxxx Vladimir V. Kozik1 Nanopowders of hydroxyapatite (HA), modifed by magnesium (MgHA) and by silicon (SiHA) were obtained by liquid-phase microwave synthesis method. X-ray difraction and IR spectroscopy results 2+ 4− showed that Mg and SiO4 ions were present in the synthesized products both as secondary phases and as part of the HA phase. Whitlockite was found in the magnesium-modifed HA (MgHA) and larnite was found in the silicon-modifed HA (SiHA); ion substitution for both materials resulted in solid solutions. In the synthesized samples of modifed HA, the increase of particle size of powders was in the order HA < SiHA < MgHA, which was calculated through data specifc surface area and measured pycnometric density of the powders. The Lewis acid sites (Ca2+, Mg2+, Si4+) were present using spectral probes on the surface of the samples of HA, MgHA, and SiHA, and the acidity of these sites decreased in the order SiHA > MgHA > HA. The rates of calcium phosphate layer deposition on the surface of these materials at 37 °C in the model simulated body fuid solution showed similar dependence. Te problem of fnding material for implantation has existed since ancient times. However, towards the end of the twentieth century the requirements for such materials and an informed and scientifcally grounded application began to form. -
Crystal Chemistry of the Monazite and Xenotime Structures Yuxxnnc Nr
American Mineralogist, Volume 80, pages2I-26, 1995 Crystal chemistry of the monazite and xenotime structures YuxxnNc Nr, JonN M. Hucnns Department of Geology, Miami University, Oxford, Ohio 45056' U.S.A. ANrrrotvv N. M.q'nr,lNo 48 PageBrook Road, Carlisle, Massachusetts01741' U.S.A. Arsrnlcr Monazite and xenotime, the RE(PO,) dimorphs, are the most ubiquitous rare earth (RE) minerals, yet accuratestructure studiesof the natural phaseshave not been reported. Here we report the results of high-precision structure studies of both the natural phasesand the synthetic RE(PO4)phases for all individual stable rare earth elements. Monazite is monoclinic, P2r/n, and xenotime is isostructural with zircon (spacegroup 14r/amd)- Both atomic arrangementsare basedon [001] chains of intervening phosphate tetrahedra and RE polyhedra, with a REO, polyhedron in xenotime that accommodates the heavy lanthanides(Tb-Lu in the synthetic phases)and a REO, polyhedron in monazite that preferentially incorporatesthe larger light rare earth elements(Ia-Gd). As the struc- ture "transforms" from xenotime to monazite, the crystallographic properties are com- parable along the [001] chains, with structural adjustments to the different sizes of RE atoms occurring principally in (001). There are distinct similarities betweenthe structuresthat are evident when their atomic arrangementsare projected down [001]. In that projection, the chains exist i! (100) planes, with two planes per unit cell. In monazite the planes are offset by 2.2 A along [010], relative to those in xenotime, in order to accommodate the larger light RE atoms. The shift of the planes in monazite allows the RE atom in that phaseto bond to an additional 02' atom to complete the REO' polyhedron. -
(M = Ca, Mg, Fe2+), a Structural Base of Ca3mg3(PO4)4 Phosphors
crystals Article Crystal Chemistry of Stanfieldite, Ca7M2Mg9(PO4)12 (M = Ca, Mg, Fe2+), a Structural Base of Ca3Mg3(PO4)4 Phosphors Sergey N. Britvin 1,2,* , Maria G. Krzhizhanovskaya 1, Vladimir N. Bocharov 3 and Edita V. Obolonskaya 4 1 Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia; [email protected] 2 Nanomaterials Research Center, Kola Science Center of Russian Academy of Sciences, Fersman Str. 14, 184209 Apatity, Russia 3 Centre for Geo-Environmental Research and Modelling, Saint-Petersburg State University, Ulyanovskaya ul. 1, 198504 St. Petersburg, Russia; [email protected] 4 The Mining Museum, Saint Petersburg Mining University, 2, 21st Line, 199106 St. Petersburg, Russia; [email protected] * Correspondence: [email protected] Received: 1 May 2020; Accepted: 25 May 2020; Published: 1 June 2020 Abstract: Stanfieldite, natural Ca-Mg-phosphate, is a typical constituent of phosphate-phosphide assemblages in pallasite and mesosiderite meteorites. The synthetic analogue of stanfieldite is used as a crystal matrix of luminophores and frequently encountered in phosphate bioceramics. However, the crystal structure of natural stanfieldite has never been reported in detail, and the data available so far relate to its synthetic counterpart. We herein provide the results of a study of stanfieldite from the Brahin meteorite (main group pallasite). The empirical formula of the mineral is Ca8.04Mg9.25Fe0.72Mn0.07P11.97O48. Its crystal structure has been solved and refined to R1 = 0.034. Stanfieldite from Brahin is monoclinic, C2/c, a 22.7973(4), b 9.9833(2), c 17.0522(3) Å, β 99.954(2)◦, 3 V 3822.5(1)Å . -
Monazite, Rhabdophane, Xenotime & Churchite
Monazite, rhabdophane, xenotime & churchite: Vibrational spectroscopy of gadolinium phosphate polymorphs Nicolas Clavier, Adel Mesbah, Stephanie Szenknect, N. Dacheux To cite this version: Nicolas Clavier, Adel Mesbah, Stephanie Szenknect, N. Dacheux. Monazite, rhabdophane, xenotime & churchite: Vibrational spectroscopy of gadolinium phosphate polymorphs. Spec- trochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Elsevier, 2018, 205, pp.85-94. 10.1016/j.saa.2018.07.016. hal-02045615 HAL Id: hal-02045615 https://hal.archives-ouvertes.fr/hal-02045615 Submitted on 26 Feb 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Monazite, rhabdophane, xenotime & churchite : vibrational spectroscopy of gadolinium phosphate polymorphs N. Clavier 1,*, A. Mesbah 1, S. Szenknect 1, N. Dacheux 1 1 ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze cedex, France * Corresponding author: Dr. Nicolas CLAVIER ICSM, CEA, CNRS, ENSCM, Univ Montpellier Site de Marcoule BP 17171 30207 Bagnols sur Cèze France Phone : + 33 4 66 33 92 08 Fax : + 33 4 66 79 76 11 [email protected] - 1 - Abstract : Rare-earth phosphates with the general formula REEPO4·nH2O belong to four distinct structural types: monazite, rhabdophane, churchite, and xenotime. -
Multiscale Characterization of Bone Mineral: New Perspectives in Structural Imaging Using X-Ray and Electron Diffraction Contrast Mariana Verezhak
Multiscale characterization of bone mineral: new perspectives in structural imaging using X-ray and electron diffraction contrast Mariana Verezhak To cite this version: Mariana Verezhak. Multiscale characterization of bone mineral: new perspectives in structural imag- ing using X-ray and electron diffraction contrast. Materials Science [cond-mat.mtrl-sci]. Communauté Universite Grenoble Alpes, 2016. English. tel-01576447 HAL Id: tel-01576447 https://hal.archives-ouvertes.fr/tel-01576447 Submitted on 23 Aug 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. THESIS In order to obtain the grade of DOCTOR OF GRENOBLE ALPES UNIVERSITY Specialty: Physics/Nanophysics Ministerial order: 7 August 2006 Presented by « Mariana / VEREZHAK » Thesis supervised by « Marie/PLAZANET » and co-supervised by « Aurélien/GOURRIER » Prepared at Laboratory of Interdisciplinary Physics at Doctoral School of Physics of Grenoble Multiscale characterization of bone mineral: new perspectives in structural imaging using X-ray and electron diffraction contrast Thesis is publically defended on « 28 October 2016 », in front of the jury composed of : Prof. Franz BRUCKERT Grenoble INP UGA, President of jury Dr. Aurélien GOURRIER LIPhy, Grenoble, co-Director of thesis Prof. Thomas LAGRANGE Institute of Technology of Lausanne, Examiner Dr. -
Mineral Collecting Sites in North Carolina by W
.'.' .., Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie RUTILE GUMMITE IN GARNET RUBY CORUNDUM GOLD TORBERNITE GARNET IN MICA ANATASE RUTILE AJTUNITE AND TORBERNITE THULITE AND PYRITE MONAZITE EMERALD CUPRITE SMOKY QUARTZ ZIRCON TORBERNITE ~/ UBRAR'l USE ONLV ,~O NOT REMOVE. fROM LIBRARY N. C. GEOLOGICAL SUHVEY Information Circular 24 Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie Raleigh 1978 Second Printing 1980. Additional copies of this publication may be obtained from: North CarOlina Department of Natural Resources and Community Development Geological Survey Section P. O. Box 27687 ~ Raleigh. N. C. 27611 1823 --~- GEOLOGICAL SURVEY SECTION The Geological Survey Section shall, by law"...make such exami nation, survey, and mapping of the geology, mineralogy, and topo graphy of the state, including their industrial and economic utilization as it may consider necessary." In carrying out its duties under this law, the section promotes the wise conservation and use of mineral resources by industry, commerce, agriculture, and other governmental agencies for the general welfare of the citizens of North Carolina. The Section conducts a number of basic and applied research projects in environmental resource planning, mineral resource explora tion, mineral statistics, and systematic geologic mapping. Services constitute a major portion ofthe Sections's activities and include identi fying rock and mineral samples submitted by the citizens of the state and providing consulting services and specially prepared reports to other agencies that require geological information. The Geological Survey Section publishes results of research in a series of Bulletins, Economic Papers, Information Circulars, Educa tional Series, Geologic Maps, and Special Publications. -
Program and Abstracts
The Atlantic Geoscience Society (AGS) La Société Géoscientifique de l’Atlantique 45th Colloquium and Annual Meeting Special Sessions: • Special Session: In Memory of Dr. Trevor MacHattie (1974 - 2018) • Paleontology and Sedimentology in Atlantic Canada: In Memory of Dr. Ron Pickerill (1947 – 2018) • Current Research in Carboniferous Geology in the Atlantic Provinces • Minerals, metals, melts, and fluids associated with granitoid rocks: new insights from fundamental studies into the genesis, melt fertility, and ore-forming processes • Earth Science Outreach in the Maritime Provinces • Geohazards: Recent and Historical General Sessions: Current Research in the Atlantic Provinces February 7-9, 2019 Fredericton Inn, Fredericton, New Brunswick PROGRAM WITH ABSTRACTS We gratefully acknowledge sponsorship from the following companies and organizations: Department of Energy and Resource Development Geological Surveys Branch Department of Energy and Mines Department of Energy and Mines Geological Surveys Division Petroleum Resources Division Welcome to the 45th Colloquium and Annual Meeting of the Atlantic Geoscience Society in Fredericton, New Brunswick. This is a familiar place for AGS, having been a host several times over the years. We hope you will find something to interest you and generate discussion with old friends and new. AGS members are clearly pushing the boundaries of geoscience in all its branches! Be sure to take in the science on the posters and the displays from sponsors, and don’t miss the after-banquet jam and open mike on Saturday night. For social media types, please consider sharing updates on Facebook and Twitter (details in the program). We hope you will be able to use the weekend to renew old acquaintances, make new ones, and further the aims of your Atlantic Geoscience Society. -
Stillwellite-(Ce) (Ce, La, Ca)Bsio
Stillwellite-(Ce) (Ce; La; Ca)BSiO5 c 2001 Mineral Data Publishing, version 1.2 ° Crystal Data: Hexagonal. Point Group: 3: As °at rhombohedral crystals, to 4 cm, and massive. Twinning: Observed about [100]. Physical Properties: Cleavage: One imperfect. Fracture: Conchoidal. Hardness = 6.5 D(meas.) = 4.57{4.60 D(calc.) = 4.67 » Optical Properties: Transparent to translucent. Color: Red-brown to pale pink; colorless in thin section. Streak: White. Optical Class: Uniaxial (+) to biaxial (+). ! = 1.765{1.784 ² = 1.780{1.787 2V(meas.) = 0±{6± Cell Data: Space Group: P 31: a = 6.841{6.844 c = 6.700{6.702 Z = 3 X-ray Powder Pattern: Mary Kathleen mine, Australia. 3.43 (s), 2.96 (s), 2.13 (ms), 4.44 (m), 1.864 (m), 2.71 (mw), 2.24 (mw) Chemistry: (1) (2) (1) (2) (1) (2) SiO2 22.40 22.06 La2O3 27.95 19.12 MgO 0.06 UO2 0.22 Ce2O3 33.15 30.82 CaO 0.95 0.34 ThO2 5.41 Pr2O3 1.82 F 0.30 + B2O3 12.23 [13.46] Nd2O3 5.36 H2O 0.85 Al2O3 0.42 Sm2O3 0.34 H2O¡ 0.10 Y2O3 0.74 0.28 Fe2O3 0.18 P2O5 0.67 Total [100.00] [99.26] (1) Mary Kathleen mine, Australia; recalculated to 100.00% after removal of very small amounts of uraninite and apatite determined by separate analysis. (2) Vico volcano, near Vetralla, Italy; by electron microprobe, B2O3 calculated from stoichiometry, original total given as 99.23%; corresponds to (Ce0:50La0:31Nd0:08Th0:05Pr0:03Ca0:02Sm0:01)§=1:00B1:02Si0:97O5: Occurrence: Locally abundant as a metasomatic replacement of metamorphosed calcareous sediments (Mary Kathleen mine, Australia); in alkalic pegmatites in syenite in an alkalic massif (Dara-i-Pioz massif, Tajikistan). -
Evaluation of a Fluorapatite-Spinel Ceramic As a Bone Implant Denginur Aksaci Iowa State University
Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1981 Evaluation of a fluorapatite-spinel ceramic as a bone implant Denginur Aksaci Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Materials Science and Engineering Commons Recommended Citation Aksaci, Denginur, "Evaluation of a fluorapatite-spinel ceramic as a bone implant " (1981). Retrospective Theses and Dissertations. 6961. https://lib.dr.iastate.edu/rtd/6961 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This was produced from a copy of a document sent to us for microfilming. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help you understand markings or notations which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to ubtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure you of complete continuity. 2. When an image on the film is obliterated with a round black mark it is an indication that the film inspector noticed either blurred copy because of movement during exposure, or duplicate copy. -
A Geological and Geochemical Study of a Sedimentary-Hosted Turquoise Deposit at the Iron Mask Mine, Orogrande, New Mexico Josh C
New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/65 A geological and geochemical study of a sedimentary-hosted turquoise deposit at the Iron Mask mine, Orogrande, New Mexico Josh C. Crook and Virgil W. Lueth, 2014, pp. 227-233 Supplemental data available: http://nmgs.nmt.edu/repository/index.cfm?rid=2014004 in: Geology of the Sacramento Mountains Region, Rawling, Geoffrey; McLemore, Virginia T.; Timmons, Stacy; Dunbar, Nelia; [eds.], New Mexico Geological Society 65th Annual Fall Field Conference Guidebook, 318 p. This is one of many related papers that were included in the 2014 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. -
Ralstonite Renamed Hydrokenoralstonite, Coulsellite Renamed Fluornatrocoulsellite, and Their Incorporation Into the Pyrochlore Supergroup
115 The Canadian Mineralogist Vol. 55, pp. 115-120 (2017) DOI: 10.3749/canmin.1600056 RALSTONITE RENAMED HYDROKENORALSTONITE, COULSELLITE RENAMED FLUORNATROCOULSELLITE, AND THEIR INCORPORATION INTO THE PYROCHLORE SUPERGROUP § DANIEL ATENCIO Instituto de Geociencias,ˆ Universidade de S˜ao Paulo, Rua do Lago, 562, 05508-080, S˜ao Paulo, SP, Brazil MARCELO B. ANDRADE S˜ao Carlos Institute of Physics, University of S˜ao Paulo, PO Box 369, 13560-970, S˜ao Carlos, SP, Brazil ARTUR C. BASTOS NETO AND VITOR P. PEREIRA Instituto de Geociencias,ˆ Universidade Federal do Rio Grande do Sul. Avenida Bento Gon¸calves 9500, CEP 91501-970, Porto Alegre, RS, Brazil ABSTRACT Ralstonite is renamed hydrokenoralstonite, ideally A2Al2F6(H2O). ‘‘Atroarite’’ and the ‘‘AHF’’ phase (hydrated aluminum hydroxy-fluoride, a ‘‘ralstonite-like mineral’’) are also hydrokenoralstonite. The name ralstonite is transferred to the group, where M3þ cations are dominant at the B site, and Al is dominant among them, and F1– is the dominant anion at the X site. Hydrokenoralstonite from the Pitinga mine, Presidente Figueiredo, Amazonas, Brazil, is intimately associated with galena and sphalerite. It forms chemically homogeneous octahedral crystals, from 0.1 to 1 mm in size. The mineral is colorless with white 3 streak, vitreous luster, transparent, density (calc.): 2.554 g/cm . Its empirical formula is (A1.87Na0.12Rb0.01)R2.00 ˚ ˚ 3 (Al1.86Mg0.14)R2.00[F3.46(OH)2.54]R6.00(H2O). The mineral is cubic, Fd3m (#227), a 9.8455(7) A, V 954.36 (12) A , Z ¼ 8. Hydrokenoralstonite exhibits (Al,Mg) cations with octahedral coordination and Na cations located within distorted cubes. -
Roscherite-Group Minerals from Brazil
■ ■ Roscherite-Group Minerals yÜÉÅ UÜté|Ä Daniel Atencio* and José M.V. Coutinho Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080 – São Paulo, SP, Brazil. *e-mail: [email protected] Luiz A.D. Menezes Filho Rua Esmeralda, 534 – Prado, 30410-080 - Belo Horizonte, MG, Brazil. INTRODUCTION The three currently recognized members of the roscherite group are roscherite (Mn2+ analog), zanazziite (Mg analog), and greifensteinite (Fe2+ analog). These three species are monoclinic but triclinic variations have also been described (Fanfani et al. 1977, Leavens et al. 1990). Previously reported Brazilian occurrences of roscherite-group minerals include the Sapucaia mine, Lavra do Ênio, Alto Serra Branca, the Córrego Frio pegmatite, the Lavra da Ilha pegmatite, and the Pirineus mine. We report here the following three additional occurrences: the Pomarolli farm, Lavra do Telírio, and São Geraldo do Baixio. We also note the existence of a fourth member of the group, an as-yet undescribed monoclinic Fe3+-dominant species with higher refractive indices. The formulas are as follows, including a possible formula for the new species: Roscherite Ca2Mn5Be4(PO4)6(OH)4 • 6H2O Zanazziite Ca2Mg5Be4(PO4)6(OH)4 • 6H2O 2+ Greifensteinite Ca2Fe 5Be4(PO4)6(OH)4 • 6H2O 3+ 3+ Fe -dominant Ca2Fe 3.33Be4(PO4)6(OH)4 • 6H2O ■ 1 ■ Axis, Volume 1, Number 6 (2005) www.MineralogicalRecord.com ■ ■ THE OCCURRENCES Alto Serra Branca, Pedra Lavrada, Paraíba Unanalyzed “roscherite” was reported by Farias and Silva (1986) from the Alto Serra Branca granite pegmatite, 11 km southwest of Pedra Lavrada, Paraíba state, associated with several other phosphates including triphylite, lithiophilite, amblygonite, tavorite, zwieselite, rockbridgeite, huréaulite, phosphosiderite, variscite, cyrilovite and mitridatite.