 | Hartmann, Léo Afraneo, da Cunha Duarte, Lauren, Massonne, Hans-Joachim, Michelin, Cassiana, Rosenstengel, Leonardo Manara, Bergmann, Magda, Theye, Thomas, Pertille, Juliana, Arena, Karine Rosa, Duarte, Sandro Kucera, Pinto, Viter Magalhães, Barboza, Eduardo Guimarães, Rosa, Maria Luiza C.C., Wildner, Wilson (2012) Sequential opening and filling of cavities forming vesicles, amygdales and giant amethyst geodes in lavas from the southern Paraná volcanic province, Brazil and Uruguay. International Geology Review, 54 (1) 1-14 doi:10.1080/00206814.2010.496253 | Journal (article/letter/editorial) | | lavas from the southern Paraná volcanic province, Brazil and Uruguay a b c Léo Afraneo Hartmann , Lauren...Federal do Rio Grande do Sul, Avenida Bento Gonçalves, Porto Alegre, Rio Grande do Sul, Brazil b Departamento...Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil c Institut für Kristallchemie...Geological Survey of Brazil (CPRM), Rua Banco da Província, Porto Alegre, Rio Grande do Sul, Brazil e Departamento...Geologia, Universidade Federal da Roraima, Rio Branco, Roraima, Brazil Published online: 06 Aug 2010. To cite |  | | Journal (article/letter/editorial) | | Macrocrystalline and Microcrystalline Quartz in Agate Using Thermogravimetry-Mass-Spectrometry Julia Richter-Feig...Chalcedony and macrocrystalline quartz from twelve agate samples were investigated, from Germany (Schlottwitz... St. Egidien, Chemnitz and Zwickau), Brazil (Rio Grande do Sul), Scotland (Ayrshire) and the USA (Montana)...found. The results indicate a silica source for the agate formation from aqueous solutions but also a possible...mobilization and transport of SiO2 . Keywords: agate; quartz; chalcedony; thermogravimetry-mass-spectrometry; |  | Gilg, H. Albert, Morteani, Giulio, Kostitsyn, Yuri, Preinfalk, Christine, Gatter, Istvan, Strieder, Adelir J. (2003) Genesis of amethyst geodes in basaltic rocks of the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil): a fluid inclusion, REE, oxygen, carbon, and Sr isotope study on basalt, quartz, and calcite. Mineralium Deposita, 38 (8) 1009-1025 doi:10.1007/s00126-002-0310-7 | Journal (article/letter/editorial) | | the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil): a fluid inclusion, REE, oxygen,...2002 Abstract In the Ametista do Sul area, Rio Grande do Sul, Brazil, amethyst-bearing geodes are hosted...an outer rim of celadonite followed inwards by agate and colorless and finally amethystine quartz. Calcite...University of Rio Grande do Sul, Oswaldo Aranha 99/504, 90035-190 Porto Alegre (RS), Brazil rare. Some...genesis of amethyst geodes in basalts at Ametista do Sul, Brazil, is thus considered as a two-stage process |  | Duarte, Lauren C., Hartmann, Leo A., Ronchi, Luiz H., Berner, Zsolt, Theye, Thomas, Massonne, Hans J. (2011) Stable isotope and mineralogical investigation of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost Paraná volcanic province. Mineralium Deposita, 46 (3) 239-255 doi:10.1007/s00126-010-0323-6 | Journal (article/letter/editorial) | | Uruguayan deposits than in the Ametista do Sul area of southern Brazil. The range of δ34S values (−15.0 to...producers of amethyst and agate geodes (600 tons/month) are Brazil (Ametista do Sul) and Uruguay (Los Catalanes)...Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil e-mail: lauren.duarte@ufrgs...Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 950091501-970, Porto Alegre, Rio Grande do Sul, Brazil...Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil e-mail: lrronchi@uol.com.br Z. Berner |  | | Journal (article/letter/editorial) | | and genesis of horizontal banding in Brazilian agate: an X-ray diffraction, thermogravimetric and electron...banded and wall-lining agate, a silica infill seals the gap between the agate and the cavity wall. The...opal-CT ? opal-C ? chalcedony pathway. K EY WORDS : agate, chalcedony, mogánite, cristobalite, horizontal...varieties in which the colour is fairly uniform and agate, in which the colour is arranged in bands (Deer...2013 The Mineralogical Society In some cases, agate contains a small amount of co-deposited calcite |  | Fulfaro, V. J., Saad, A. R., Perinotto, J. A. J., Etoherehere, M. L. C., Verolavsky, G. (1997) Paraná Basin: Mineral Resource Potentials in Brazil, Uruguay, and Paraguay. International Geology Review, 39 (8) 703-722 doi:10.1080/00206819709465297 | Journal (article/letter/editorial) | | com/loi/tigr20 Paraná Basin: Mineral Resource Potentials in Brazil, Uruguay, and Paraguay a a a V. J. Fulfaro ...Paulista (UNESP) , Caixa Postal 178, Rio Claro SP, 13506-900, Brazil b Institute de Geologia y Paleontologia...(1997) Paraná Basin: Mineral Resource Potentials in Brazil, Uruguay, and Paraguay, International Geology Review... Paraná Basin: Mineral Resource Potentials in Brazil, Uruguay, and Paraguay V. J. F U L F A R O , A...Paulista (UNESP), Caixa Postal 178, 13506-900 Rio Claro SP, Brazil Downloaded by [University of Colorado - |  | | Book | | Professor Jacques P. Cassedanne Universidade Federal do Rio de Janeiro For his valuable participation in research...1982 Jules Roger Sauer ” 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. “Brazil, Paradise of Gemstones’, by Jules Roger Sauer, |  | Hartmann, L.A., Medeiros, J.T.N., Baggio, S.B., Antunes, L.M. (2015) Controls on prolate and oblate geode geometries in the Veia Alta basalt flow, largest world producer of amethyst, Paraná volcanic province, Brazil. Ore Geology Reviews, 66. 243-251 doi:10.1016/j.oregeorev.2014.11.005 | Journal (article/letter/editorial) | | producer of amethyst, Paraná volcanic province, Brazil L.A. Hartmann a,⁎, J.T.N. Medeiros b, S.B. Baggio...Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91501-970...Alegre, Rio Grande do Sul, Brazil Instituto de Física, Universidade Federal do Rio Grande do Sul, Avenida...Gonçalves, 9500, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil a r t i c l e i n f o Article history:...alteration of the Veia Alta basalt flow, Ametista do Sul, Brazil, exerted the fundamental control on the shape |  | Baggio, S.B., Hartmann, L.A., Andrade, R.H.P., Rizzotto, G.J., Duarte, S.K., Knijnik, D.B., Simões-Neto, J.A. (2015) Basalt stratigraphy and silica gossans in Campo Grande and Serra de Maracaju, Mato Grosso do Sul, Paraná Volcanic Province. Ore Geology Reviews, 69. 73-87 doi:10.1016/j.oregeorev.2015.01.015 | Journal (article/letter/editorial) | | and silica gossans in Campo Grande and Serra de Maracaju, Mato Grosso do Sul, Paraná Volcanic Province...and silica gossans in Campo Grande and Serra de Maracaju, Mato Grosso do Sul, Paraná Volcanic Province...silica gossans in Campo Grande and Serra de Maracaju, T Mato Grosso do Sul, Paraná volcanic province...Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento NU a SC R D.B. Knijnika...Agronomia; 91501-970 Porto Alegre, Rio Grande do Sul, b MA Brazil Departamento Nacional de Produção |  | | Report (issue) | | kind of jewelry and stones were favored by well-to-do customers four centuries ago. Sir Robert Eric Mortimer...influence on the world amethyst market emerged in Brazil (see page 66), where the discovery of rich deposits...foreigners (non Portuguese) doing business in Brazil influenced the availability, and therefore the...362-carat cushion-cut gem from the Jacobea Mine, Bahia, Brazil, that is housed in the Smithsonian. Another, a...rough, specimen 9.8 cm tall Amatitlan, Zumpango del Rio, Guerrero, Mexico Canadian Museum of Nature specimens |  | | Journal (article/letter/editorial) | | Eur. J. Mineral. 2002, 14, 1109–1118 Agate: a study of ageing TERRY MOXON 55 Common Lane, Auckley, Doncaster...measured using X-ray powder diffraction. A plot of agate crystallite size vs log age of host rock shows a...increase in density. A high correlation between agate crystallite size and age of host rock shows that...determination of crystallite size in wall-lining agate allows either an estimation of the approximate age...rock or an identification of a known agate region. Key-words: agate, dating, silica, X-ray, genesis, density |  | Arena, K.R., Hartmann, L.A., Baggio, S.B. (2014) Geological controls of copper, gold and silver in the Serra Geral Group, Realeza region, Paraná, Brazil. Ore Geology Reviews, 63. 178-200 doi:10.1016/j.oregeorev.2014.05.005 | Journal (article/letter/editorial) | | the Serra Geral Group, Realeza region, Paraná, Brazil K.R. Arena, L.A. Hartmann, S.B. Baggio PII: DOI:...the Serra Geral Group, Realeza region, Paraná, Brazil, Ore Geology Reviews (2014), doi: 10.1016/j.oregeorev... Paraná, Brazil MA NU Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida...Gonçalves, 9500; 91501-970 Porto Alegre, Rio Grande do Sul, Brazil ED E-mail addresses: PT Karine da...Serra Geral Group, Realeza region, SC Paraná, Brazil MA NU Karine da Rosa Arena, Léo Afraneo Hartmann* |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...Crystal of multicolored tourmaline (84 x 26 mm), Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais...(Camara Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo...pedras preciosas do Brasil Bibliography 1. Gemology 2. Geology 3. Minerals - Brazil 4. Minerals- Classification... Mineralogy 6. Mineralogy - Brazil - History 7. Precious stones - Brazil I. Bartorelli, Andrea. II. Title |  | | Journal (article/letter/editorial) | | expressed the opinion that the "trap" field of southern Brazil and adjacent regions was possibly greater in extent...hydrographic basin (Amazonia) and the eastern part of the Rio Paraguay drainage basin. The drainage basin of the...are northeast-southwest, parallel to the southern Brazil and Uruguay coast line, and to the major axis of...southern Goyaz, twelve miles north of the town of Rio Bonito, the writer found shales lithologically similar...Rocks of South Brazil. In English and Portuguese. Report to the Ministry of Industry, etc. Rio de Janeiro |  | Gilg, H. Albert, Krüger, Yves, Taubald, Heinrich, van den Kerkhof, Alfons M., Frenz, Martin, Morteani, Giulio (2014) Mineralisation of amethyst-bearing geodes in Ametista do Sul (Brazil) from low-temperature sedimentary brines: evidence from monophase liquid inclusions and stable isotopes. Mineralium Deposita, 49 (7) 861-877 doi:10.1007/s00126-014-0522-7 | Journal (article/letter/editorial) | | Mineralisation of amethyst-bearing geodes in Ametista do Sul (Brazil) from low-temperature sedimentary brines: evidence...Paraná continental flood basalts at Amestita do Sul, Brazil. Monophase liquid inclusions in colourless...Flood Basalt (CFB) Province in southern Brazil (Ametista do Sul) and Uruguay (Artigas), i.e. in rocks with...of two-phase inclusions reported in these studies do not yield consistent results and scatter from 66...amethyst, calcite, barite and gypsum from the Ametista do Sul area. Single ultrashort pulses of a tightly focussed |  | | Journal (issue) | | C h a r l e s E. Asl7baugh I I I Amethyst from Brazil D a v i d S t a n l e y Epstein NOTES AND NEW...that had been irradiated in nuclear reactors in Brazil and released while they were still highly radioactive...of facilities active in the U.S. as well as in Brazil, Europe, and Southeast Asia. According to the American...United States, and not necessarily GIA's, However, we do applaud the Nuclear Regulatory Con~mission's recent...quick succession. The beta particles from the Co-60 do not contribute to the radiation dose since they are |  | | Journal (article/letter/editorial) | | 1223–1244 A re-examination of water in agate and its bearing on the agate genesis enigma TERRY MOXON 55 Common...atmospheric water vapour pressure conditions. After agate acclimatization at 20°C and 46% relative humidity...problems have consequences for water quantification in agate and chalcedony using infrared or thermogravimetric...thermogravimetric techniques. Mobile and total water in agate is considered in relation to host-rock age, mogánite...contents allowing comment on quartz development and agate genesis. The water data also supports previous claims |  | | Journal (article/letter/editorial) | | 370 ROCKS & MINERALS centers of simple faces that do not contain prominent edges. The calcite seen in... (1) formation of a thin inner wall of banded agate (in this respect the Artigas amethyst geodes differ...Illinois, showing growth channels along three the agate lining of the scalenohedral edges. Such channels...Ametista do Sul, Rio but not on the amethyst (this is the only occurrence of Grande do Sul, Brazil, some...amethyst geode from near Ametista do Sul, Rio Grande do Sul, Brazil. The hammer is 30 cm long. David J |  | | Journal (article/letter/editorial) | | minerals Review Agate Genesis: A Continuing Enigma Terry Moxon 1 and Galina Palyanova 2,3, * 1 2 3 ...discussions based on observations on host rock and agate thick sections. Over the next 25 years, experimental...identifying the physical and chemical properties of agate. The outcome of this work has allowed limited evidence-based...evidence-based comment on the conditions of agate formation. There is a general consensus that agates...Keywords: agate; chalcedony; XRD; genesis; moganite; crystallite growth; age 1. Introduction Agate and chalcedony |  | | Journal (article/letter/editorial) | | which form agate nodules in vesicles and fissures of volcanic host rocks. The term agate again describes...indeed microcrystalline quartz in volcanogenic agate nodules forms by such processes from hydrothermal...hydrothermal conditions, should give information on agate genesis. Fibrous quartz was synthesized by Nacken...less than 1 wt.% water, whereas typical volcanic agate quartz species show total water contents between..."-species incorporated would throw further light on agate formation. Generally, the analytically determined |  | | Book | | until he managed to reach the land of his dreams, Brazil. A specialist in the field of geology and mineralogy...crystals and the remarkable mineral treasures of Brazil, as well as the incredible adventures and difficulties...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL Cyan Magenta Yellow Black 1 Delev Ilia Deleff...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL SOFIA–MOSCOW 2004 3 Cyan Magenta Yellow Black...MINERAL TREASURES OF BRAZIL 76 85 AN OUTLINE OF THE MINERAL RESOURCES OF BRAZIL ORIGIN OF GIANT CRYSTALS |  | | Journal (article/letter/editorial) | | Morto, Piaui, Brazil Boi Morto, Piaui, Brazil Gran Canaria, Spain Rio Grande do Sul, Brazil Angaston, South...Minas Gerais, Brazil Rio Grande do Sul, Brazil Stevns, Denmark Rio Grande do Sul, Brazil manufactured...opal-CT filling of an agate geode white nodule of opal-CT white opal-C layer of an agate geode white opal-C...opal-C layer of an agate geode dark flint nodule translucent grey chalcedony band of an agate geode synthetic |  | | Journal (article/letter/editorial) | | horizontal layer of an agate geode of an agate geode of an agate geode of an agate geode white wall-lining...Gerais, Brazil Rio Grande do Sul, Brazil Rio Grande do Sul, Brazil Rio Grande do Sul, Brazil Brazil Brazil...Querretaro, Mexico Angaston, Australia Rio Grande do Sul, Brazil Gran Canaria, Spain Coober Pedy, Australia...Cu-K~ radiation). Both samples stem from the same agate geode (no. 238). Lussatite is the first wall-lining |  | | Journal (article/letter/editorial) | | for self-organizational behavior to be possible, agate c~s~li~tion must take place from an initial medium...incorporate no or (even for quartz) little Al, and do not become twisted. The model correctly accounts...way accounts for those textures and compositions. Agate formation combines crystallographic, dynamic. petrologic...gels. We have studied ten agates from Rio Grande do Sul, Brazil. by optical microscopy, microprobe. and...coexist in the same agate. We have studied ten agates from Rio Grande do Sul, Brazil, under an optical |  | Remus, M.V.D., Hartmann, L.A., McNaughton, N.J., Groves, D.I., Reischl, J.L. (2000) Distal Magmatic-Hydrothermal Origin for the Camaquã Cu (Au-Ag) and Santa Maria Pb, Zn (Cu-Ag) Deposits, Southern Brazil. Gondwana Research, 3 (2) 155-174 doi:10.1016/s1342-937x(05)70094-0 | Journal (article/letter/editorial) | | and Santa Maria Pb, Zn (Cu-Ag) Deposits, Southern Brazil M.V.D. Remusl, L.A. Hartmannl, N.J. McNaughton2...Geocie^ncias, Universidade Federal do Xi0 Grande do Sul, Porto Alegre, RS, Brazil 'Centre for Strategic Mineral... Australia 3Companhia Brasileira do Cobre, Porto Alegre, RS, Brazil (Manuscript received March 6, 1999;...above is critical for base-metal exploration in the Sul Riograndense Shield. Previous exploration methodologies...part of the Sul- Riograndense Shield, near the city of Caqapava do Sul, southern Brazil (Figs. 1and |
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Rio Grande do Sul, Brazil