Crystal Morphology and Xrd Peculiarities of Brazilianite from Different Localities
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The Secondary Phosphate Minerals from Conselheiro Pena Pegmatite District (Minas Gerais, Brazil): Substitutions of Triphylite and Montebrasite Scholz, R.; Chaves, M
The secondary phosphate minerals from Conselheiro Pena Pegmatite District (Minas Gerais, Brazil): substitutions of triphylite and montebrasite Scholz, R.; Chaves, M. L. S. C.; Belotti, F. M.; Filho, M. Cândido; Filho, L. Autor(es): A. D. Menezes; Silveira, C. Publicado por: Imprensa da Universidade de Coimbra URL persistente: URI:http://hdl.handle.net/10316.2/31441 DOI: DOI:http://dx.doi.org/10.14195/978-989-26-0534-0_27 Accessed : 2-Oct-2021 20:21:49 A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos. Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um endereço de IP da instituição detentora da supramencionada licença. Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra. Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso. pombalina.uc.pt digitalis.uc.pt 9 789892 605111 Série Documentos A presente obra reúne um conjunto de contribuições apresentadas no I Congresso Imprensa da Universidade de Coimbra Internacional de Geociências na CPLP, que decorreu de 14 a 16 de maio de 2012 no Coimbra University Press Auditório da Reitoria da Universidade de Coimbra. -
Refinement of the Crystal Structure of Ushkovite from Nevados De Palermo, República Argentina
929 The Canadian Mineralogist Vol. 40, pp. 929-937 (2002) REFINEMENT OF THE CRYSTAL STRUCTURE OF USHKOVITE FROM NEVADOS DE PALERMO, REPÚBLICA ARGENTINA MIGUEL A. GALLISKI§ AND FRANK C. HAWTHORNE¶ Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada ABSTRACT The crystal structure of ushkovite, triclinic, a 5.3468(4), b 10.592(1), c 7.2251(7) Å, ␣ 108.278(7),  111.739(7), ␥ 71.626(7)°, V 351.55(6) Å3, Z = 2, space group P¯1, has been refined to an R index of 2.3% for 1781 observed reflections measured with MoK␣ X-radiation. The crystal used to collect the X-ray-diffraction data was subsequently analyzed with an electron microprobe, 2+ 3+ to give the formula (Mg0.97 Mn 0.01) (H2O)4 [(Fe 1.99 Al0.03) (PO4) (OH) (H2O)2]2 (H2O)2, with the (OH) and (H2O) groups assigned from bond-valence analysis of the refined structure. Ushkovite is isostructural with laueite. Chains of corner-sharing 3+ 3+ {Fe O2 (OH)2 (H2O)2} octahedra extend along the c axis and are decorated by (PO4) tetrahedra to form [Fe 2 O4 (PO4)2 (OH)2 3+ (H2O)2] chains. These chains link via sharing between octahedron and tetrahedron corners to form slabs of composition [Fe 2 (PO4)2 (OH)2 (H2O)2] that are linked by {Mg O2 (H2O)4} octahedra. Keywords: ushkovite, crystal-structure refinement, electron-microprobe analysis. SOMMAIRE Nous avons affiné la structure cristaline de l’ushkovite, triclinique, a 5.3468(4), b 10.592(1), c 7.2251(7) Å, ␣ 108.278(7),  111.739(7), ␥ 71.626(7)°, V 351.55(6) Å3, Z = 2, groupe spatial P¯1, jusqu’à un résidu R de 2.3% en utilisant 1781 réflexions observées mesurées avec rayonnement MoK␣. -
Reflective Index Reference Chart
REFLECTIVE INDEX REFERENCE CHART FOR PRESIDIUM DUO TESTER (PDT) Reflective Index Refractive Reflective Index Refractive Reflective Index Refractive Gemstone on PDT/PRM Index Gemstone on PDT/PRM Index Gemstone on PDT/PRM Index Fluorite 16 - 18 1.434 - 1.434 Emerald 26 - 29 1.580 - 1.580 Corundum 34 - 43 1.762 - 1.770 Opal 17 - 19 1.450 - 1.450 Verdite 26 - 29 1.580 - 1.580 Idocrase 35 - 39 1.713 - 1.718 ? Glass 17 - 54 1.440 - 1.900 Brazilianite 27 - 32 1.602 - 1.621 Spinel 36 - 39 1.718 - 1.718 How does your Presidium tester Plastic 18 - 38 1.460 - 1.700 Rhodochrosite 27 - 48 1.597 - 1.817 TL Grossularite Garnet 36 - 40 1.720 - 1.720 Sodalite 19 - 21 1.483 - 1.483 Actinolite 28 - 33 1.614 - 1.642 Kyanite 36 - 41 1.716 - 1.731 work to get R.I. values? Lapis-lazuli 20 - 23 1.500 - 1.500 Nephrite 28 - 33 1.606 - 1.632 Rhodonite 37 - 41 1.730 - 1.740 Reflective indices developed by Presidium can Moldavite 20 - 23 1.500 - 1.500 Turquoise 28 - 34 1.610 - 1.650 TP Grossularite Garnet (Hessonite) 37 - 41 1.740 - 1.740 be matched in this table to the corresponding Obsidian 20 - 23 1.500 - 1.500 Topaz (Blue, White) 29 - 32 1.619 - 1.627 Chrysoberyl (Alexandrite) 38 - 42 1.746 - 1.755 common Refractive Index values to get the Calcite 20 - 35 1.486 - 1.658 Danburite 29 - 33 1.630 - 1.636 Pyrope Garnet 38 - 42 1.746 - 1.746 R.I value of the gemstone. -
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. -
Geology of Barium, Strontium, and Fluorine Deposits in Canada
ECONOMIC GEOLOGY REPORT 34 GEOLOGY OF BARIUM, STRONTIUM, AND FLUORINE DEPOSITS IN CANADA K.R. DAWSON 1985 © Minister of Supply and Services Canada 1985 Available in Canada through authorized bookstore agents and other bookstores or by mail from Canadian Government Publishing Centre Supply and Services Canada Ottawa, Canada KlA OS9 and from Geological Survey of Canada offices: 60 l Booth Street Ottawa, Canada KlA OE8 3303-33rd Street N. W., Calgary, Alberta T2L 2A7 100 West Pender Street Vancouver, British Columbia V6B 1R8 (mainly B.C. and Yukon) A deposit copy of this publication is also available for reference in public libraries across Canada Cat. No. M43-34/1985E Canada: $13.00 ISBN 0-660-11902-1 Other countries: $15.60 Price subject to change without notice Critical Readers R.I. Thorpe K.M. Dawson G.F. Leech D.C . Findlay Original manuscript submitted: 1981 - 07 Approved for publication: 1983 - 04 Preface Preface Barium, strontium and fluorine have many industrial Le baryum, le strontium et le fluor connaissent de applications. All have been produced in Canada during this nombreuses utilisations industrielles. Le Canada en a produit century but at present our needs for strontium chemicals, tout au long du siecle m2is ii doit actuellement en importer, crude fluorite and fluorine chemicals are met by imports, principalement du Mexique et des Etats-Unis, pour subvenir a mainly from Mexico and the United States. ses besoins de derives chimiques de strontium et de fluorine , ainsi que de fluor brut. Barite is primarily employed in the heavy drilling muds La barytine est surtout utilisee par l'industrie used in the petroleum exploration industry. -
GEMSTONES by Donald W
GEMSTONES By Donald W. Olson Domestic survey data and tables were prepared by Christine K. Pisut, statistical assistant, and the world production table was prepared by Glenn J. Wallace, international data coordinator. Gemstones have fascinated humans since prehistoric times. sustaining economically viable deposits (U.S. International They have been valued as treasured objects throughout history Trade Commission, 1997, p. 23). by all societies in all parts of the world. The first stones known The total value of natural gemstones produced in the United to have been used for making jewelry include amber, amethyst, States during 2001 was estimated to be at least $15.1 million coral, diamond, emerald, garnet, jade, jasper, lapis lazuli, pearl, (table 3). The production value was 12% less than the rock crystal, ruby, serpentine, and turquoise. These stones preceding year. The production decrease was mostly because served as status symbols for the wealthy. Today, gems are not the 2001 shell harvest was 13% less than in 2000. worn to demonstrate wealth as much as they are for pleasure or The estimate of 2001 U.S. gemstone production was based on in appreciation of their beauty (Schumann, 1998, p. 8). In this a survey of more than 200 domestic gemstone producers report, the terms “gem” and “gemstone” mean any mineral or conducted by the USGS. The survey provided a foundation for organic material (such as amber, pearl, and petrified wood) projecting the scope and level of domestic gemstone production used for personal adornment, display, or object of art because it during the year. However, the USGS survey did not represent possesses beauty, durability, and rarity. -
A Specific Gravity Index for Minerats
A SPECIFICGRAVITY INDEX FOR MINERATS c. A. MURSKyI ern R. M. THOMPSON, Un'fuersityof Bri.ti,sh Col,umb,in,Voncouver, Canad,a This work was undertaken in order to provide a practical, and as far as possible,a complete list of specific gravities of minerals. An accurate speciflc cravity determination can usually be made quickly and this information when combined with other physical properties commonly leads to rapid mineral identification. Early complete but now outdated specific gravity lists are those of Miers given in his mineralogy textbook (1902),and Spencer(M,i,n. Mag.,2!, pp. 382-865,I}ZZ). A more recent list by Hurlbut (Dana's Manuatr of M,i,neral,ogy,LgE2) is incomplete and others are limited to rock forming minerals,Trdger (Tabel,l,enntr-optischen Best'i,mmungd,er geste,i,nsb.ildend,en M,ineral,e, 1952) and Morey (Encycto- ped,iaof Cherni,cal,Technol,ogy, Vol. 12, 19b4). In his mineral identification tables, smith (rd,entifi,cati,onand. qual,itatioe cherai,cal,anal,ys'i,s of mineral,s,second edition, New york, 19bB) groups minerals on the basis of specificgravity but in each of the twelve groups the minerals are listed in order of decreasinghardness. The present work should not be regarded as an index of all known minerals as the specificgravities of many minerals are unknown or known only approximately and are omitted from the current list. The list, in order of increasing specific gravity, includes all minerals without regard to other physical properties or to chemical composition. The designation I or II after the name indicates that the mineral falls in the classesof minerals describedin Dana Systemof M'ineralogyEdition 7, volume I (Native elements, sulphides, oxides, etc.) or II (Halides, carbonates, etc.) (L944 and 1951). -
Diamond Dan's Mineral Names Dictionary
A Dictionary of Mineral Names By Darryl Powell Mineral Names What do they mean? Who created them? What can I learn from them? This mineral diction‐ ary is unique because it is illustrated, both with mineral drawings as well as pictures of people and places after which some minerals are named. The people pictured on this page have all made a con‐ tribution to what is formally called “mineral nomenclature.” Keep reading and you will discover who they are and what they did. In 1995, Diamond Dan Publications pub‐ lished its first full book, “A Mineral Collector’s Guide to Common Mineral Names: Their Ori‐ gins & Meanings.” Now it is twenty years later. What you will discover in this issue and in the March issue is a re‐ vised and improved version of this book. This Mineral Names Dictionary contains mineral names that the average mineral collector will encounter while collecting minerals, attending shows and visiting museum displays. In addition to the most common min‐ eral names, there are some unofficial names which you will still find on labels. Each mineral name has a story to tell or a lesson to teach. If you wanted to take the time, each name could become a topic to study. Armalcolite, for example, could quickly be‐ come a study of a mineral, first discovered on the moon, and brought back to earth by the astronauts Armstrong, Aldrin and Collins (do you see parts of their names in this mineral name?) This could lead you to a study of American astronauts landing on the moon, what it took to get there and what we discovered by landing on the moon. -
Treasure Companion 001-027.Pmd
Part I Concepts & Premises 2.3 GEMS Gems have been valued for thousands of years for their beauty, rarity, and supposed magical abilities. Amethysts were thought to protect the wearer from intoxication and poison. Diamonds were seen as a remedy for all sicknesses. The beautiful green color of emeralds were not normally seen in other stones. For these reasons, and a multitude of others, individuals have fought and died to transport, sell, and mine these precious commodities. 2.3.1 PROPERTIES Gems are described by a variety of properties. These properties come from two areas. The first is the chemical composition of the gem. Most gemstones are minerals that have formed into crystals. The nature of these crystalline formations determines the transparency (how much light the gemstone will transmit), luster (the appearance of light TREASURE from a polished stone), specific gravity (a measure of COMPANION density), and hardness. There are many other properties determined by chemical composition, but these are the BH main ones that let jewelers tell one type of stone from the next. 13 The second factor that determines properties in gem- stones is the admixtures that occur within the stones. MOHS’ HARDNESS SCALE Admixtures are other minerals that occur in trace amounts Scale Reference Mineral Note and give color to many gems. If we look at a type of gemstone, such as corundum, we find that it is made of 1 Talc Scratched with Part I aluminum oxide. This chemical composition provides it 2 Gypsum fingernail Concepts & with its hardness, its transparency, its specific gravity, and Premises other factors. -
E. M. Barron Exhibit of Minerals and Gem Collections
E. M. Barron Exhibit of Minerals and Gem Collections Join us for a virtual tour of these rare and beautiful specimens Colonel E. M. Barron Colonel E. M. Barron (1903-1969) of El Paso, Texas, one time State legislator and military man, turned his attention to minerals in later life, founding the Southern Gem Mining Company in the late 1940s. Opportunities to acquire rare and beautiful minerals were abundant. Mexico was close by and over the years Barron built a remarkable personal collection of rare specimens from Mexico. Barron bequeathed most of his collection to The University of Texas at Austin. Mineral localities Barron’s interests focused early on Mexico but expanded to classic localities around the world. Each red dot represents a locality from which one, or more, of his minerals were extracted. The Exhibit Minerals are naturally occurring, inorganic solids with definite chemical compositions and definite atomic structures (they are crystalline). Halite (salt) Chemical composition is the basis for grouping the exhibited minerals. Each display case is arranged by chemical class; carbonates, silicates etc. Exhibit Display Cases • 1. Introductory panel • 7, 8. Gems • 2. Silicates – 7. Gems and gemstones • 3. Native elements – 8. Cut and color • 4. Amethyst geode • 9. Topaz • 5. Carbonates and • 10. Agates phosphates [ includes arsenates, vanadates and • Numbers are located on the phosphates] exhibit map (next slide) • 6. Tungsten and molybdates [focus- wulfenite] Exhibit Map 3 1 GG1 More information about G2 the specimens More about -
Bulletin 30, Gem Stone Resources of South Carolina
GEM STONE RESOURCES OF SOUTH CAROLINA By CAMILLA K. McCAULEY BULLETIN NO. 30 DIVISION OF GEOLOGY STATE DEVELOPMENT BOARD COLUMBIA, SOUTH CAROLINA 1964 STATE DEVELOPMENT BOARD Columbia, South Carolina MEMBERS OF BOARD W. W. Harper Director J. Bratton Davis, Chairman Columbia Hampton G. Anderson Anderson Russell E. Bennett Cheraw „.,., „ Sumter Clifton Brown Elting L. Chapman, Jr. Florence John F. Clarkson Newberry W. K. Gunter, Jr. Gaffney A. Foster McKissick Easley Connie R. Morton Rock Hill R. RoyPearce Columbia Walter P. Rawl Gilbert Joseph P. Riley Charleston Thomas S. Taylor Orangeburg Stathy J. Verenes Aiken E. Craig Wall Conway Bernard Warshaw Walterboro R. M. Cooper (honorary) Wisacky mm mm* STATE DEVELOPMENT BOARD Columbia, South Carolina To The Honorable Donald S. Russell Governor of South Carolina Sir: Submitted herewith is State Development Board Bulletin 30, Gem Stone Resources of South Carolina. This report by Camilla K. McCauley was prepared as part of the Division of Geology's continuing program of investigation of the geo logy and mineral resources of the State. mi Sincerely, Walter W. Harper, Director Henry S. Johnson, Jr. , State Geologist 3H CONTENTS Page Abstract 1 Introduction 1 History and production 2 Occurrence 11 Igneous rocks 11 Metamorphic rocks 12 Aqueous solutions and organic accumulations 13 Placer deposits 13 South Carolina gem stone deposits 13 Beryl (emerald) 16 Beryl (other varieties) 16 Corundum (ruby and sapphire) 16 Diamond 17 Garnet 18 Quartz 18 S illimanit e 19 Topaz 19 Tourmaline 20 Zircon 20 Uses 26 Properties of gem stones 26 Mining and beneficiation methods 27 Prices 27 Reserves 28 29 Synthetics 29 Outlook 30 References 31 Index ILLUSTRATIONS Page Figure 1- Generalized geologic map of South Carolina 14 2. -
Vibrational Spectroscopy of the Phosphate Mineral Lazulite €“ (Mg
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 107 (2013) 241–247 Contents lists available at SciVerse ScienceDirect Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy journal homepage: www.elsevier.com/locate/saa Vibrational spectroscopy of the phosphate mineral lazulite – (Mg, Fe)Al2(PO4)2Á(OH)2 found in the Minas Gerais, Brazil ⇑ Ray L. Frost a, , Yunfei Xi a, Martina Beganovic b, Fernanda Maria Belotti c, Ricardo Scholz b a School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia b Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil c Federal University of Itajubá, Campus Itabira, Itabira, MG 35903-087, Brazil highlights graphical abstract " In this work, we have studied the structure of lazulite. " Lazulite is pegmatite phosphate with calculated formula (Fe0.11)Al1.86(PO4)2.08(OH)2.04. " The structure of lazulite was assessed using a combination of Raman and infrared spectroscopy. article info abstract Article history: This research was done on lazulite samples from the Gentil mine, a lithium bearing pegmatite located in the Received 20 September 2012 municipality of Mendes Pimentel, Minas Gerais, Brazil. Chemical analysis was carried out by electron Received in revised form 6 November 2012 microprobe analysis and indicated a magnesium rich phase with partial substitution of iron. Traces of Ca Accepted 23 January 2013 and Mn, (which partially replaced Mg) were found. The calculated chemical formula of the studied sample Available online 1 February 2013 is: (Mg0.88,Fe0.11)Al1.87(PO4)2.08(OH)2.02.