 | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | Journal (article/letter/editorial) | | gemmy, intense purple apatites from this pegmatite mine have made Pulsifer the premier locality for fluorapatite...” 5.6 cm tall, Alchori, Shigar Valley, Skardu district, GilgitBaltistan, Pakistan. Private collection...syenite pegmatites in the Imilchil area, High Altas Mountains, Morocco (Jahn et al. 2003); the Alpine clefts...Swan Hill Rural City, Victoria Aberfoyle mine, Rossarden district, Tasmania Complex metamorphosed sedimentary...Norte and Paraíba: e.g., Sapo mine, Ferruginha; Golconda district, Governador Valadares; Linópolis |  | | Journal (issue) | | of prehnite have been found, the famous Jeffrey Mine in Asbestos, Quebec, Canada. I found well-crystalized...April 2021 2 Rare prehnite crystals, Jeffrey Mine, Asbestos, Quebec, Canada. Photo: Bob Cooke. The...have contributed to the unusual colors in the Merelani deposits. Whatever the geologic cause, the result...with color choices. Prehnite on epidote, Kayes Region, Mali. Photo: Bob Cooke. China is a large country...for prehnite with associated epidote is the Kayes Region of Mali. Spheres of translucent pea green prehnite |  | | Report (issue) | | _________________ _ Spor Mountain block ___________________ _ Bla.ck Rock Hills block..: _____________ .:. __ _...Mountain block _________________ _ Dugway Ridge block ___________________ _ Fan dangle block ___ - ___________________...___________________ _ Buckhorn block _______________________ _ Kellys Hole block ______________________ _ ...faults-----------.,.---------Structure of the volcanic block ______________ _ Age of faulting ________ ·----...Confidence ____________________________ _ Four Metals mine ______________________ _ Francis _______________________________ |  | | Book | | (clockwise from top left): Quartz Citrine crystal; Fluorite; Vanadanite; Quartz crystal (see text for details)...(field of view 8 cm). Figure 1.3 An opencast iron ore mine (Postmasburg, South Africa). 7 microscopes, or...which are essentially spherical (figure 2.3A), and p, d and f orbitals (figure 2.3B, C), which are shaped...three equivalent orbitals occupied by electrons, the d as a set of five and the f as a set of seven orbitals...orbitals (A) (B) y x x y z z z The five d orbitals (D) (C) y x x y z Figure 2.3 The shapes and |  | | Journal (issue) | | James E. Shigley Andy Lucas Donna Beaton Stuart D. Overlin Nathan Renfro Elise A. Skalwold John I....etching, in quartz crystals from India’s Jalgaon District. NOTES AND NEW TECHNIQUES 82 Characteristics...Montana sapphire production • Magnesio-axinite from Tanzania • Sustainable vertical integration in sapphires...Robert Weldon survey Brazil’s diamond deposits. This region has produced a significant number of large rough...Omi regions of Niigata Prefecture and the Wakasa region of Tottori Prefecture and compares them with samples |  | | Journal (issue) | | (British Omineca Columbia) Vitim East Sayan Mountains Lillooet (California) CHINA Nanjiang Luchuan...Nelson North Westland South Westland Livingstone Mountains NEW ZEALAND Wakatipu Figure 1: Nephrite jade...composition: some Pacific Rim examples a b c d Figure 2: Nephrite jades of similar appearance from...from the Pacific Rim: (a) East Sayan Mountains, Siberia, Russia, (b) Olderog Creek, North Westland, New...uniform textures; (c) South Westland, New Zealand; (d) Cassiar, British Columbia. These examples do contain |  | | Journal (issue) | | Cindy Edelstein RETAILING IN THE NEW MILLENNIUM E d i t o r ’ s n o t e : Because of contractual restrictions...jewelry is courtesy of Neil Lane Jewelry, Beverly Hills, California. Photo © GIA and Tino Hammid. G EMS...made it possible to recover diamonds from the Ekati mine, in the bitter cold of Canada’s Northwest Territories...diamond reserves, and future potential. The new Ekati mine in Canada’s frigid Northwest Territories, Namdeb’s...the mining companies to develop and economically mine increasingly hard-to-access diamonds. Technology |  | | Book | | . . . . 4.1.2 Polymetallic Veins in the Ore Mountains . . . . . . . . . . . 4.2 Orogenic Gold Veins...Diatomite (Diatomaceous Earth) . . . . . . . . 7.14 Fluorite and Baryte . . . . . . . . . . . . . . . . . 7... Research trips led him to Oldoinyo Lengai in Tanzania, through the High Atlas in Morocco, and to the...East African carbonatites led him to Uganda and Tanzania. He works at CRB Analyse Service GmbH in Hardegsen...is the minimum grade at which it is worthwhile to mine a certain deposit. Everything below it (low-grade |  | Chen, Yan-Jing, Wang, Pin, Li, Nuo, Yang, Yong-Fei, Pirajno, Franco (2017) The collision-type porphyry Mo deposits in Dabie Shan, China. Ore Geology Reviews, 81. 405-430 doi:10.1016/j.oregeorev.2016.03.025 | Journal (article/letter/editorial) | | China Geological Survey, Chengdu 610081, China d Centre for Exploration Targeting, University of Western...Stirling Highway, Crawley TE CE P WA6009, Australia D c AC *Corresponding author: yjchen@pku.edu.cn or...with the MA Precambrian rocks of the North China block, except for the Tianmugou porphyry system which...geochemical characteristics with the porphyry Mo deposits D in eastern Qinling Orogen. We also develop a scissor-style...In the model, the basement of the North China Block southwardly underthrusted beneath the Dabie AC |  | | Journal (issue) | | jewelry indrrstry In fi~tingtribute, this 89.01-ct D-internally flawless modified shield cut- the Guinea...rcpublication permission, please contact the editor. Gems d Gemology is published quarterly by the Gemological... Postmaster: Return undeliverable copies of Gems d Gemology to 1660 Stewart St., Santa ~Monica,CA 90404...EDITORIAL STAFF Associate Editors William E. Boyajian D. Vincent Manson John Sinkanltas Technical Editor Carol...equal pride that we present in this issue of Gems d Gemology a very special pre-Symposium section including |  | | Book | | 73 The Fennoscandian Shield 5 The Skellefte District . . . . . . . . . . . . . . . . . . . . . . ....for Exploration—The Kupferschiefer in The Lubin Region, Poland . . . . . . . . . . . P. Mejia, J.J. Royer...and D. Ballas 299 1 Introduction Pär Weihed Abstract This book is the result of 3- and 4-D modelling...Europe addressed the issue of pan-European 3- and 4 D geological models as a basis for mineral exploration...visualizing the geological evolution of the district. 3-D predictivity maps are also presented using some |  | | Report (issue) | | sciences. Published separately as Chapters A, B, C, and D UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON:...year the volume consists of 4 chapters (A through D) of Professional Paper 501. Chapter A contains a summary...A277. The tables of contents for chapters B through D are listed on pages A271-A275. Next year, the sixth...A and for critical review of papers in chapters B-D. He was assisted by George Phair, who was largely...Detergents and pesticides in water supplies ___ _ Acid mine waters __________________________ _ Indus trial |  | | Journal (article/letter/editorial) | | http://www.tandfonline.com/ page/terms-and-conditions D O * LADY STRACTS Ati Abstracts from earth science...Dominikovskiy, G . G . (403-406). line base of the Orshanian d e p r e s s i o n . T e c t o n i c s and geological...with its r e c e n t l y d i s c o v e r e d downwarps and o t h e r s (fig. 1), d r l l l c o r e data,...and stable from the Archean to the E a r l y - M i d d l e Proterozoic; c) while the E a r l y P r o t e...Platform, the Orshanian d e p r e s s i o n r e m a i n e d tectonically calm; d) the Orshanian downwarping |  | | Journal (article/letter/editorial) | | Polyphase strain partitioning and reactivation TE D Jérôme Ganne ∗ , P.G. Betts, R. Weinberg, M. Noble...et al. / Precambrian Research 143 (2005) 50–74 TE D demonstrate (a) that the processes of deformation...et al. / Precambrian Research 143 (2005) 50–74 TE D 52 R ET R AC Fig. 1. (a) Simplified map of the...Curnamona Province and reinterpreted the Broken Hill Block as a series of discrete early high-grade structure...(upright) RSZ R D4 D5 AC Not investigated TE D Not investigated D3* (upright folds trending NW–SE; |  | | Journal (article/letter/editorial) | | PT Richard J. Goldfarba,b,c* and David I. Grovesc,d U.S. Geological Survey, Box 25046, MS 964, Denver...and Geographical Sciences, University of Western d MA Australia, Crawley, Western Australia, Australia...Close, Leeming, WA 6149, Australia TE Abstract D *corresponding author: goldfarb@usgs.gov AC CE P...and for Phanerozoic ores of +7 to +13 per mil; (2) D and 34S values that are extremely variable; (3) 13C...the O, S, and C ratios. The extreme variations in D mainly reflect measurements of hydrogen isotopes by |  | | Journal (article/letter/editorial) | | 2 , N O . 9, P P . 1 3 9 - 1 6 8 , P L . 6. 18TH D E C E M B E R , 1967 GEOPHYSICAL INVESTIGATIONS OF...February, 1966) CONTENTS I. II. III. (a) (b) (c) (d) IV. page INTRODUCTION T H E GRAVITY AND MAGNETIC...B L O C K 140 141 142 T h e gravity survey a n d its interpretation .... T h e R o o k h o p e borehole...borehole T h e sub-surface shape of the W e a r d a l e Granite M a g n e t i c anomalies .... .... ......gravity survey a n d its interpretation .... .... T h e m a g n e t i c anomalies a n d their interpretation |  | | Report (issue) | | INTENTIONALLY BLANK Figure 1 Vulture and Congress Mine field-trip stops. BACKGROUND MATERIAL Il Arizona...Reynolds . 1977. in press ; Hardin g. 1978; Eberly an d Stanley . 197 8 ; Keith . 1978 ; Otton . 197 8 ; C...Marshak . 1 97 9 ; Robison . 197 9 ; S uneson an d Lucchitta , 1979; Davis and others . in press ; S...red as follo ws : ( 1) Dome Rock Mountains , (2) Plomosa Mountains , ( 3) Ne w Wate r Moun t a ins ...Livin gston H ills , ( 5) Kofa Mountains , ( 6) Little Ho rn Mountains , ( 7) Ceme te ry Rid ge , ( 8) |  | | Report (volume) | | contributors to this volume were James W. Clarke, Georgianna D. Conant, Howard R. Cramer, Bettie S. Hackman, Elizabeth...Geophys. Union Geophys. Mon. Monograph. Washington, D. C. Am. Jour. Botany Baltimore, Md. American Geophysical...Mineralogist - American Mineralogist. Washington, D. C. University of Notre Dame. Mineralogical Society...America. Montreal, Quebec, Canada, and Washington, D. C. Arctic and Alpine Research- Arctic and Alpine...Paper. Montreal, Quebec, Canada, and Washington, D. C. Arctic lnst. North America Tech. Paper- Arctic |  | | Journal (article/letter/editorial) | | Standard in High-Pressure Crystallography R. J. ANGEL, D. R. ALLAN,5" R. MILETICH AND t . W. FINGER + Bayerisches...Bayerisches Geoinstitut, Universitaet Bayreuth, D-95440, Bayreuth, Germany. E-mail: ross.angel@uni-bayreuth...the measurement of the unit-cell volume of CaF2 fluorite included in the diamond-anvil pressure cell. The...determine pressure (e.g. Forman, Piermarini, Barnett & Block, 1972). This has the advantage that the ruby crystal...described the use of fluorite, CaF2, as such an internal pressure standard, and the fluorite equation of state |  | | Report (issue) | | paralle l to host-rock bedding. Black Cloud mine, Leadville district. Sherman-type ore (bottom) in paleokarst...veined with ferroan dolomite. rv1oose mine, North Alma district. Photographs b)' \Villiarn Sacco, Peabody...Carbonate-hosted sulfide deposits of the central Colorado mine ral belt: Introduction, general discussion, and...Johansing Leadville district: Geology and the origin of ore deposits in the Leadville district, Colorado: Part...and the origin of ore deposits in the Leadville district, Colorado: Part II. Oxygen, hydroge n, carbon |  | | Report (volume) | | Washington, D. C. 20242. The principal contributors to this volume were James W. Clarke, Georgianna D. Conant...Mon. Monograph. Washington, D. C. Am. Geophys. Union Trans. Washington, D. C. Am. Jour. Botany Baltimore...Mineralogist - American Mineralogist. Washington, D. C. University of Notre Dame. Mineralogical Society...America. Montreal, Quebec, Canada, and Washington, D. C. Arctic Anthropology- Arctic Anthropology. University...Paper. Montreal, Quebec, Canada, and Washington, D. C. IX BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, |  | | Journal (issue) | | Science LLC, Tokyo, Japan Executive Editor Alan D. Hart Editorial Assistant Carol M. Stockton Editor...Harvard University, Cambridge, Massachusetts, USA Alan D. Hart Gem-A, London Karl Schmetzer Petershausen,...MEMBER Martin Rapaport CHIEF EXECUTIVE OFFICER Alan D. Hart COUNCIL Justine L. Carmody – Chair Nevin Bayoumi-Stefanovic...carbon footprint of each individual diamond’ from its mine origin to the polished gem. The data can 642 THE...locality (Figure 5) in central China: the Qinling Mountains in Zhen’an County, Shaanxi Province, where they |  | | Report (edition) | | Corries’ towards Aonach Beag (1234 m), Glen Roy district, Lochaber. The frostshattered exposures in the...well-bedded Glencoe Quartzite (Lochaber Subgroup) (D 4196). log On one your bw badcy 10 of ove SUaVOA...FOURTH EDITION By D Stephenson, PhD and D Gould, PhD Contributors: G C Clark PhD D J Fettes PhD T P... JW Merritt BSc R M W Musson PhD W Mykura DSc J D Peacock PhD D1 Smith PhD LONDON HER MAJESTY'S STATIONERY...Councib, & Bibliographic reference STEPHENSON, D, and Goutp, D. © NERC copyright 1995 First published 1935 |  | | Report (volume) | | contributors to this volume were James W. Clarke, Georgianna D. Conant, Howard R. Cramer, Bettie S. Hackman, Virginia...S. 04470 04358 Acker, Louis L.; Hatcher, Robert D., Jr. Relationships between structure and topography...deposit- Discussion [of paper by L. G. Soderman andY. D. Kim, 1970]: Canadian Geotech. Jour., v. 7, no. 2...illus., 1970. Adams, John A. S. See Baldwin, Otha D. 00482 Adams, John A. S. See Hartung, Jack B. 06393...Adams, SamuelS. Ore controls, Carlsbad potash district, southeast New Mexico, in Third symposium on salt |
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D-Block Mine, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania