 | | Book | | 1982 Jules Roger Sauer ā Foreword For years Brazil has been the major producer of colored stones in...metamorphic rocks, the variety of gem deposits in Brazil is almost infinite. In addition to the mineral...assemblage one might expect from pegmatite dikes, Brazil also produces a very significant output of diamonds...written in English, and beautifully illustrated. āBrazil, Paradise of Gemstonesā, by Jules Roger Sauer,...Century. The book is a showcase ofthe best from Brazil and it makes a handsome evocation of what is beautiful |  | da Costa, G. M., Van San, E., De Grave, E., Vandenberghe, R. E., BarrĆ³n, V., Datas, L. (2002) Al hematites prepared by homogeneous precipitation of oxinates: material characterization and determination of the Morin transition. Physics and Chemistry of Minerals, 29 (2) 122-131 doi:10.1007/s002690100201 | Journal (article/letter/editorial) | | De Grave R. E. Vandenberghe Ć” V. BarroĆn Ć” L. Datas Al hematites prepared by homogeneous precipitation...Universidade Federal de Ouro Preto, 35400, Ouro Preto, Brazil E. Van San (&) Ć” E. De Grave Ć” R. E. Vandenberghe...University of CoĆrdoba, 14080, CoĆrdoba, Spain L. Datas CIRIMAT (LCMIE), UniversiteĆ Paul Sabatier, F-31062...of local probe analysis (at% Ala) Presence of corundum at the grain bounderies 0 2 4 6 8 10 12 14 16...anticipated value as a consequence of the presence of corundum outside the oxide particles. Over 10 at% Al, where |  | Montel, Jean-Marc, Razafimahatratra, Dieudonne, de Parseval, Philippe, Poitrasson, Franck, Moine, Bernard, Seydoux-Guillaume, Anne-Magali, Pik, RaphaĆ«l, Arnaud, Nicolas, Gibert, FranƧois (2018) The giant monazite crystals from Manangotry (Madagascar) Chemical Geology, 484. 36-50 doi:10.1016/j.chemgeo.2017.10.034 | Journal (article/letter/editorial) | | the most famous of which being Colorado (USA), Minas Gerais (Brasil), and Arendal (Norway). Alpine clefts...pegmatites du district de Santa Maria de ltabira (Minas Gerais, Brasil). C.R. Acad. Sci., Earth Sci., 326,...Seydoux-Guillaume, A.M., Duchene, S., Bingen B., Bosse, V., Datas, L. (2016). Sulphate incorporation in monazite lattice...140-158. Seydoux-Guillaume A-M, David M-L, Alix K., Datas L., and Bingen B. (2016). Trapping of helium in...Jordt-Evangelistaa, H. (2002). Age of pegmatites from eastern Brazil and implications of mica intergrowths on cooling |  | | Journal (issue) | | Cuprian Liddicoatite Siliconās Role in the Color of Corundum 2017 Tucson Report Editorial Staff Editor-in-Chief...Diamonds, Cuprian Liddicoatite, and Silicon in Corundum Duncan Pay FEATURE ARTICLES 2 Brazilian Diamonds:...geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production... 42 The Role of Silicon in the Color of Gem Corundum John L. Emmett, Jennifer Stone-Sundberg, Yunbin...Diamonds, Cuprian Liddicoatite, and Silicon in Corundum Welcome to the first Gems & Gemology of 2017! |  | | Book | | BARTORELLI ::ā¢ . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA Ā©...Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais. Collection of Alvaro Lucio. Photograph taken...Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo, Andrea...3. Minerals - Brazil 4. Minerals- Classification 5. Mineralogy 6. Mineralogy - Brazil - History 7. Precious...Precious stones - Brazil I. Bartorelli, Andrea. II. Title. 09-10025 Cover photograph: Crystal of brazilianite |  | | Journal (issue) | | Warren A new find of crystallized rose quartz in Minas G e ra is ........................................B-2120 Schoten COVER: ELBAITE on quartz from Minas Gerais, Brazil. The crystal is 8.5 mm in width. Photo by...experiences in Brazil. Caplan was the first to bring museumquality mineral specimens out o f Brazil, specimens...rhodocrosite. MR: W hat made you decide to go to Brazil. Were you looking for greener pastures? CAPLAN:...tourmaline crystals from Brazil. I decided that the place to go was Brazil in order to continue doing |  | | Journal (issue) | | Namibia, as well as Madagascar), South America (Brazil and Colombia), central and southern Asia (Sri Lanka...Pakistan; and pink to red tourmalines from Nigeria and Brazil. Diamond was mined in northern Canada for the first...mining also continued at traditional sources in Brazil and Africa. Large quantities of Brazilian emeralds...the early ā90s, particularly from GoiĆ”s and Minas Gerais (primarily the Nova Era area). By the middle...decline from Minas Gerais due to decreased reserves and reduced demand. Emerald production in Brazil has since |  | Saragovi, C., Arpe, J., Sileo, E., Zysler, R., Sanchez, L. C., Barrero, C. A. (2004) Changes in the structural and magnetic properties of Ni?substituted hematite prepared from metal oxinates. Physics and Chemistry of Minerals, 31 (9) 625-632 doi:10.1007/s00269-004-0422-y | Journal (article/letter/editorial) | | The crystal structure is the same as that of corundum, Al2O3, which can be described as rhombohedral...da Costa et al. (2002) also found impurities (corundum) in their Alhematite obtained from oxinates with...(1965) Magnetic anisotropy in antiferromagnetic corundum-type sesquioxides. Phys Rev 138: A912-A917 Brand...San E, De Grave E, Vandenberghe RE, BarroĢn V, Datas L (2002) Al hematites prepared by homogeneous precipitation...San E, De Grave E, Vandenberghe RE, Desseyn HO, Datas L, BarroĢn V, Rousset A (2001) Study of Al-substituted |  | | Journal (issue) | | Gelaude Senaite from the Fazenda Guariba, Minas Gerais, Brazil...........................................1986 Semite from the Fazenda Guariba, Minas Gerais, Brazil J. P. Cassedanne Instituto de Geociencias...Universitaria Ilha do Fundao, 29.910 Rio de Janeiro, Brazil INTRODUCTION Senaite, Pb(Ti,Fe,Mn)220 38, has...diamond-bearing gravels from the Diamantina area, Minas Gerais, Brazil. The material was first reported by Damour...had been collected from waterworn gravels near Datas. It was subsequently reported (always from stream |  | Van San, E. Van, De Grave, E., Vandenberghe, R. E., Desseyn, H. O., Datas, L., BarrĆ³n, V., Rousset, A. (2001) Study of Al-substituted hematites, prepared from thermal treatment of lepidocrocite. Physics and Chemistry of Minerals, 28 (7) 488-497 doi:10.1007/s002690100169 | Journal (article/letter/editorial) | | De Grave Ć” R. E. Vandenberghe H. O. Desseyn Ć” L. Datas Ć” V. BarroĆn Ć” A. Rousset Study of Al-substituted...University of Antwerp, 2020 Antwerpen, Belgium L. Datas Ć” A. Rousset Interuniversity Centre for the Research...techniques. It has the same crystal structure as corundum (Al2O3) and can be looked upon as either rhombohedral...non-substituted sample, both shift to higher (more corundum-like) wave numbers. The 597-cm)1 band evolves...(1965) Magnetic anisotropy in antiferromagnetic corundum-type sesquioxides. Phys Rev (A) 138: 912Ā±917 |  | | Journal (issue) | | Palladium and platinum from Corrego Bom Sucesso, Minas Gerais, B razil...............................471 by...Universitaria Ilha do Fundao 21.190 Rio de Janeiro, Brazil Jeanete N. Alves Departamento de Recursos M ineralsāRJ...ineralsāRJ Rua Marechal Deodoro 351 24.030 Niteroi, Brazil The Corrego Bom Sucesso prospect is one o f Brazilās...Horizonte and southeast of Diamantina in central Minas Gerais, Brazil. It is near the historic town of Serro.... Access is by way of the tarred Datas-Serro road (MG 010), from which a small unpaved road branches off |  | | Report (issue) | | Janeiro______________________ Sao Paulo__________________________ Minas Gerais_______________________ Espirito Santo______________________...Monazite localities-Continued South America-Continued Brazil-Continued Beach placers _________________________...and Idaho. Most of the world output has come from Brazil, India, and the Republic of South Africa, but 12...beaches and elevated bars along the southern coast of Brazil were the world's main source of commercial monazite...international importance. Stream placers in the interior of Brazil are virtually unexplored; they may constitute an |  | | Journal (article/letter/editorial) | | Thermodynamics and crystal chemistry of the hematiteācorundum solid solution and the FeAlO3 phase Received:...investigate the energetics and structure of the hematiteācorundum solid solution and ternary phase FeAlO3 (with...solid solution should be considered. The hematiteācorundum solvus can be approximately reproduced by a symmetric...positive for Al-hematite but almost ideal for Fe-corundum. Moreover, the degree of deviation from Vegardās...the LiNbO3-, FeGaO3-, FeTiO3-, and disordered corundum-like FeAlO3 structures are less stable (in the |  | | Journal (article/letter/editorial) | | kaolinitic plasma: kaolinite TABLE VI Crystallographic datas of kaolinite crystals A.S.T.M. 14--64 1 hkl dobs...V). 54o ,~7o 378 TABLE VII Crystallographic datas of hematite crystals A.S.T.M. 24--72 hkl 1 d (~)...--124.50 62.25 -1.72 ---5.16 2.58 hematite corundum 14.48 12.76 38.94 75.54 --53.75 ,1 Gray-purple...kaolinite hematite hematite Chemical balance corundum 733.5 7.37 38.6 1.28 696.7 23.02 44.5 1.74...100% Al-hematite with 7 mole% A1203 (expressed as corundum) 14.74 11.26 --43.48 96.66 --63.07 388 4.2 |  | Zboril, R., Mashlan, M., Barcova, K., Walla, J., Ferrow, E., Martinec, P. (2003) Thermal behaviour of pyrope at 1000 and 1100 ļæ½C: mechanism of Fe2+ oxidation and decomposition model. Physics and Chemistry of Minerals, 30 (10) 620-627 doi:10.1007/s00269-003-0355-x | Journal (article/letter/editorial) | | member (Mg3Al2Si3O12) at temperatures of 1200 C, corundum and enstatite were identiļ¬ed as the decomposition...results in the decomposition to enstatite and corundum and the former is probably the host compound for...San E, De Grave E, Vandenberghe RE, Desseyn HO, Datas L, Barron V, Rousset A (2001) Study of Al-substituted |  | | Journal (article/letter/editorial) | | 0.17 ; MnO : 0.03 % ; ZnO : 0.15 %. Andalusite (Minas Geraes, Brasilia), Sillimanite (Custer, U.S.A.)...temperatures. In view of the pre]imiuary nature of these datas and due to the uncertainty of the sillimanlte/kyanite...pyrophyllite + vapor (ALTn~VS,1966) 2. diaspore = corundum q- vapor ( K ] ~ E D u et al., 1967) 3. pyrophyllite...in section H I . l a 8. paragonite ~ albite ~ corundum ~- vapor ( C ] t A T T E R J E E , 1968) 9. talc...S was also evaluated from experimental entropy datas (pyrophyllite: KING written comm. 1968; quartz: |  | | Journal (issue) | | 0026-4628 'Continued on p. 415 Articles Diamonds in Brazil .................................................Fundao 21.910 Rio de Janeiro, Brazil Since their discovery in Minas Gerais, near the town of Diamantina...mining, fables and dreams. By the end of the 1700ās Brazil had become the worldās leading producer of diamonds...century. fficially the discovery of diamonds in Brazil is dated at 1727. Gold prospectors had found occasional...false idea that Brazil is a producer.ā The sheer volume of diamonds coming from Brazil soon overwhelmed |  | | Report (issue) | | Argentina ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ 123 Brazil ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ ā¢ Surinam ā¢ ā¢ ā¢...States. Topaz is also known in Malaya, Nigeria and Brazil. Dumortierite is a basic aluminium borosilicate...usually less pronounced than in the other minerals. Corundum, which is often a desirable associate of minerals...response is stated to be due to chromic oxide. Corundum often causes a pink fluorescence in Indian kyanite...Idaho Corundum Apatite Apatite Pink White Pinkish S. Africa (heated) I Korea ! Colorado Corundum Kyanite |  | | Book | | potential deposits of SiO2 raw materials in Argentina, Brazil, Germany and Norway. The third part of the book...collaboration between scientists from Australia, Brazil, Canada, Germany, Norway, Switzerland and the USA...Color-Enhancing of Gemological Crystalline Quartz in Brazil . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . 6.3.3 Quartz Color-Enhancing in Brazil. . . . . . . . . . . . . . . . . . . . . . 139...50740-530, Brazil Mario L. S. C. Chaves Departamento de Geologia, IGC, Universidade Federal de Minas Gerais |  | Laurent, Antonin T., Duchene, Stephanie, Bingen, Bernard, Bosse, Valerie, Seydoux-Guillaume, Anne-Magali (2018) Two successive phases of ultrahigh temperature metamorphism in Rogaland, S. Norway: Evidence from Y-in-monazite thermometry. Journal of Metamorphic Geology, 36 (8) 1009-1037 doi:10.1111/jmg.12425 | Journal (article/letter/editorial) | | widely different (e.g. AnĆ”polisāItauƧu complex, Brazil: Baldwin, & Brown, 2008; compared to Della Giustina...%), with minor ilmenite, biotite, sillimanite, corundum, diaspore, pinite and accessory monazite, zircon...AnĆ”polisāItauƧu Complex, Southern BrasĆlia Belt, central Brazil ā constraints from UāPb geochronology, mineral...metamorphism in the AnĆ”polisāItauƧu Complex, Central Brazil. Lithos, 124(1-2), 82ā102. https://doi.org/10.1016/j...Seydoux-Guillaume, A.-M., Duchene, S., Bingen, B., Bosse, V., & Datas, L. (2016). Sulphate incorporation in monazite lattice |  | | Book | | Sapphires-History, idenrification, value, etc. I.Title. 3. Corundum-History, identification, value, ere. 4. Precious...composition 48 The corundum suucture 48 Crystallography of corundum 50 Twinning in corundum 52 Morphology...inclusions 97 Describjng inclusions 99 Overview of corundum inclusions I 00 Country descriptions of inclusions...100 24 Acknowledgments 1 S 20 7 Synthetic corundum 139 Alchemist's dreams 139 Enter Verneuil 141...visible abso rpcion spectra I 54 Synthetic scar corundum 155 Czochralski (pulling) process 159 Floating-zone |  | Wu, Dongqian, Sun, Fengyue, Pan, Zhongcui, Yu, Lu, Li, Liang, Gao, Hongchang, Tian, Nan, Xu, Chenghan (2021) Neoproterozoic magmatic and metamorphic imprints in the East Kunlun Orogenic Belt, North Tibetan Plateau, NW China: Implications for the assembly and initial breakup of the Rodinia supercontinent. Precambrian Research, 354. 106076pp. doi:10.1016/j.precamres.2020.106076 | Journal (article/letter/editorial) | | which deserve re-evaluation. Some unrecorded GPS datas are recalculated on the basis of labels in figure...the charnockite sample was reflected by the high corundum muscovite content in the mineral assembly and...1999). In the CIPW calculation reĀ sults, the corundum content (1.10ā9.46) is extremely high, and aluminarich |  | | Journal (article/letter/editorial) | | Seydoux-Guillaume, A. M., Duchene, S., Bingen, B., Bosse, V., & Datas, L. (2016). Sulphate incorporation in monazite lattice...zone. (c) Thin section of kyanite-, rutile- and corundum-bearing eclogite, partly reequilibrated during...symplectitic (sy) reaction rims of sapphirine, corundum, and anorthite around kyanite, orthopyroxene+ |  | | Journal (article/letter/editorial) | | Standards are: albite (NaKĪ±), periclase (MgKĪ±), corundum (AlKĪ±), wollastonite (Si and CaKĪ±), sanidine (KKĪ±)...the Electron Microprobe and with the SEM, and L. Datas and L. Weingarten for their technical assistance |  | | Book | | ........... ..' ...................... .. 183 Corundum . . . . . . . . . . . . . . . . . . . . . . ....variety. . Pr'l'nmatic tlpaz, any simple variety. Corundum, from India, which affords smooth cleavage surfaces..... . . . . . . . . . . . . . . . .1 '812 Blue corundum (sapphire) . . . . . . . . . . . . . . . . . ...the individual minerals, as may be seen by the corundum and topaz. Double refraction, whether positive...of trichromatic, the iolite, the andalusite from Brazil, the diaspore from Schemnitz, and the axinite. |
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