 | Gilg, H. Albert, KrĂŒger, 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:...ParanĂĄ continental flood basalts at Amestita do Sul, Brazil. Monophase liquid inclusions in colourless...distinguished. In stage I, celadonite, chalcedony and pyrite formed under reducing conditions in a thermally...thermally stable environment. Low ÎŽ34SV-CDT values of pyrite (â25 to â32â°) suggest biogenic sulphate reduction...Flood Basalt (CFB) Province in southern Brazil (Ametista do Sul) and Uruguay (Artigas), i.e. in rocks with |  | 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) | | of the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil): a fluid inclusion, REE, oxygen...Springer-Verlag 2002 Abstract In the Ametista do Sul area, Rio Grande do Sul, Brazil, amethyst-bearing geodes are...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...temperature inïŹll of the cavity. Keywords Amethyst Ă Brazil Ă Geochemistry Ă Isotope Introduction Amethyst |  | 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 ParanĂĄ 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 ÎŽ34S values (â15...and agate geodes (600 tons/month) are Brazil (Ametista do Sul) and Uruguay (Los Catalanes). The cylindrical...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 |  | Voudouris, Panagiotis, Melfos, Vasilios, Mavrogonatos, Constantinos, Tarantola, Alexandre, GÓ§tze, Jens, Alfieris, Dimitrios, Maneta, Victoria, Psimis, Ioannis (2018) Amethyst Occurrences in Tertiary Volcanic Rocks of Greece: Mineralogical, Fluid Inclusion and Oxygen Isotope Constraints on Their Genesis. Minerals, 8 (8) 324 doi:10.3390/min8080324 | Journal (article/letter/editorial) | | substitutional, e.g., [3], or interstitial [5]. Brazil is the main amethyst producer today, counting more...albite, and wollastonite (for K, Na, Si and Ca), pyrite for Fe, and synthetic Ti, Cr, Mn, MgO and Al2 O3...polarized); (b) Clinoptilolite-Ca (Cpt), including pyrite (Py), and calcite (Cal) that overgrow polarized);...polarized); (b) Clinoptilolite-Ca (Cpt), including pyrite (Py), and calcite (Cal) that overgrow amethystine amethystine...zeolites, chlorite, adularia and in minor amounts pyrite, smectite, goethite and lepidocrocite (Figure 4) |  | | 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 |  | | Book | | BARTORELLI ::âą . . .. 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 (issue) | | Source from Ethiopia Mining 38 Touring Mines in Brazil Gemology 50 Fluid Inclusions Confirm Authenticity...gem-manufacturing countries, including India, Thailand, Brazil, and China. Meanwhile new gem mineral resources...Mining and Fair Trade certification in Rio de Janeiro, Brazil, last May. These are among the many issues...Congress Focuses on Ethical Mining and Fair Trade Rio de Janeiro was the venue for the 14th biennial Congress...major gem mining, production, and trade centers. ââBrazil has become an important player in the worldwide |  | | Journal (issue) | | South Dakota, USA| Gems from Mong Long, Myanmar|Pyrite and other sulphides from Peru|Purple spinel from...Articles 708 Coloured Stone Mining and Trade in Brazil: A Brief History and Current Status By AurĂ©lien...Collection V. L. Villani photo p. 758 Cover Photo: Brazil is the source of a variety of coloured stones,... 693 Gem Notes Pyrite and Other Sulphides for Jewellery Use, from Peru Pyrite has been used in jewellery...sold as âmarcasiteâ. The source of much of this pyrite is the Huanzala mine in west-central Peru, which |  | | Journal (issue) | | paragenesis in an amethyst geode From Ametista, Rio Grande do Sul, Brazil . . . . . . . . . . . ...(half-inch and up) crystals with brilliant pyritohedral pyrite from Utah, in cabinet-size specimens to $25. In...(no doubt from the type locality at Corrego Frio, Brazil) in crystals to 2 inches, priced at $15; pink morganite...morganite beryl crystal groups from Brazil; and paravauxite from Llallagua, Bolivia, among many others...finely divided electrum associated with quartz, pyrite and adularian orthoclase in fractures and as disseminations |  | | Journal (article/letter/editorial) | | number of journals as an information service. Please do not write to us to obtain copies of the journals...Vol. 326â327, 2012 LA-ICPMS and EPMA studies of pyrite, arsenopyrite and loellingite from the Bhukia-Jagpura...structures in the Ametista do Sul geode mining district, ParanĂĄ volcanic province, southern BrazilâL.M. Rosenstengel |  | | Journal (article/letter/editorial) | | agates and the related famous amethyst geodes of Brazil and Uruguay. Agates form over a wide range of temperatures...carbonate rocks and the famous amethyst druses of Brazil and Uruguay formed at the moderate temperatures...investigators of agates (e.g., FIG. 1. Agate from Brazil with concentric and horizontal (onyx) banding composed...Post 1992). In a specimen of agate from Rio Grande do Sul, Brazil (Fig. 1), the concentric and horizontal...described using samples from Scotland (Heddle 1901) and Brazil (Freyberg 1927). If the basaltic or andesitic lavas |  | | Journal (article/letter/editorial) | | associated with calcite, 4.9 cm. Uli Bahmann specimen. do have small balls of prehnite attached or partial...ferric-, magnesium-, or manganese-rich species. Pyrite, FeS2, has been reported by von Bezing (2006)....of the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil): A fluid inclusion, REE, oxygen |  | | Journal (issue) | | right: Topaz, 8.4 cm, from Ouro Preto, Minas Gerais, Brazil. Lower left: Phosphophyllite, 2 cm, from the Unificada...perfection-seeker first sees a specimen, his eyes do a quick inventory of dings. If he finds none, out...competitive. Emphasis on perfection has little to do with science in that perfection is an accident and...available to us to find, buy, enjoy and learn from if we do not insist on absolute specimen perfection. If everyone...Andrea Bartorelli: Minerals and Precious Stones of Brazil. Other important references (if any) for individual |  | | Catalog/List | | cut bid). Any podium, fax, phone, or mail bids that do not conform to a full or half increment will be rounded...purpose of identifying the items for those Bidders who do not have the opportunity to view the lots prior to...contacted by Heritage in the future. In conformity with âdo-not-callâ regulations promulgated by the Federal...browse for the lot you are interested in. You can do this from the home page, from the Auctions home page...zone differences, etc. We will make sure that you do not bid against yourself. Mail Bidding Instructions |  | Renac, Christophe, Kyser, Kurtis, Bowden, Peter, Moine, Bertrand, Cottin, Jean-Yves (2010) Hydrothermal fluid interaction in basaltic lava units, Kerguelen Archipelago (SW Indian Ocean) European Journal of Mineralogy, 22 (2) 215-234 doi:10.1127/0935-1221/2009/0022-1993 | Journal (article/letter/editorial) | | lava piles around the world in Scotland, Iceland, Brazil, Namibia, Columbia River and India, very few contain... ââiddingsitic olivineââ and calcite with rare pyrite between and within plagioclase laths (CT 419, Table...surrounding phenocrysts of microcline and rare pyrite. In both areas of this study, many geodes show...zoned subhedral quartz, and variations in dDH2 O do not agree with the suggestion by Harris (1989) of...of the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil): a fluid inclusion, REE, oxygen |  | | Journal (article/letter/editorial) | | as the ParanĂĄ Continental Flood Basalt Province, Brazil or the Deccan Trap Province, India strong indications...are polysynthetically twinned according to the Brazil-twin law, with the c-axis slightly twisted around...of chalcedony and the high frequency of defects, Brazil twinning and twisting in the chalcedony âfibersâ...periodic twinningtwinning accordingaccording to the Brazil-twin stacking oflayers layers rightâ leftâhanded...occurrence pure moganite is rare, the intergrowth of Brazilâtwin law at the scale [86]. the of pure moganite |  | | Journal (article/letter/editorial) | | number of journals as an information service. Please do not write to us to obtain copies of the journals...study of monoclinic pyrrhotite in equilibrium with pyrite in the Ag-Fe-S system by solid-state electrochemical...Mineralisation of amethyst-bearing geodes in Ametista do Sul (Brazil) from low-temperature sedimentary brines:...iron formation in India and a lateritic soil in BrazilâBeate Orberger, Christiane Wagner, and Alina Tudryn |  | | Book | | as the ParanĂĄ Continental Flood Basalt Province, Brazil or the Deccan Trap Province, India strong indications...are polysynthetically twinned according to the Brazil-twin law, with the c-axis slightly twisted around...of chalcedony and the high frequency of defects, Brazil twinning and twisting in the chalcedony âïŹbersâ...quartz, with a periodic twinning according to the Brazil-twin law at the unit-cell scale [86]. Although...However, Flörke [95] ïŹrst suggested that most agates do not contain any opal-A. It can be assumed that most |  | | Journal (issue) | | from the Urucum mine, GalilĂ©ia, Minas Gerais, Brazil. Gus & Jane Eifler collection; Holly Smith photo...Record, NovemberâDecember, 2020 Kevin Brown Pyrite after baculite fossil, 14.9 cm, from State Bridge...cm, from Hematita, Antonio Dias, Minas Gerais, Brazil. Tom Spann photo. (below right) Spinel twin on...9 cm, from Corrego SĂŁo Francisco, Minas Gerais, Brazil. Tom Spann photo. Rhodochrosite on manganite, 20...albite, 4.9 mm, Poaia pegmatite, Minas Gerais, Brazil. Beth Van Allen photo. 24 Elbaite tourmaline |  | | Catalog/List | | other lots I will need to use a separate bid sheet. Do you want to receive an email, text message, or fax...cut bid). Any podium, fax, phone or mail bids that do not conform to a full or half increment will be rounded...specimen collecting policy on the part of Kennecott and Rio Tinto Mining Companies during the period of operation...$400-$600 53003 TOURMALINE Himalaya Mine, Mesa Grande, San Diego County, California, USA San Diego County...of which begs the question: âAnd just how did it do that?â Answering that question is not a prerequisite |  | Ottens, Berthold, Götze, Jens, Schuster, Ralf, Krenn, Kurt, Hauzenberger, Christoph, Zsolt, BenkĂł, Vennemann, Torsten (2019) Exceptional Multi Stage Mineralization of Secondary Minerals in Cavities of Flood Basalts from the Deccan Volcanic Province, India. Minerals, 9 (6) 351 doi:10.3390/min9060351 | Journal (article/letter/editorial) | | southeastern southeastern Parana Parana Basin, Basin, Brazil Brazil [29,30]. [29,30]. The comprehensive similarities...secondary minerals in other basalt provinces [9,10,13], do not occur in the main part of the DVP. The zeolites...prehnitepumpellyite, julgoldite, hematite, and pyrite. Vrâvery rare; rârare;coâoccasionally; câcommon;...Filamentous Fabrics (SFFs) SFFs occur in cavities, which do not meet the terminological requirements for caves...and morphological features prove that the filaments do not represent stalactites or speleothems. Amethyst-bearing |  | | Book | | was guest lecturer at universities in Austria, Brazil, Norway, Italy, Poland, Spain, and Russia and was...Surprisingly, sub-grains with other orientations do not show the same effect and only the intensity of...cut-off values for every QG assigned in this study do not exactly correspond to those used in the industry...the morphological characteristics of the diatoms do not show any particular pattern regarding the QG...Figure 3d. In contrast, biogenic aragonite crystals do not affect the porosity, due to their particle size |  | | Book | | was guest lecturer at universities in Austria, Brazil, Norway, Italy, Poland, Spain, and Russia and was...Surprisingly, sub-grains with other orientations do not show the same effect and only the intensity of...cut-off values for every QG assigned in this study do not exactly correspond to those used in the industry...the morphological characteristics of the diatoms do not show any particular pattern regarding the QG...Figure 3d. In contrast, biogenic aragonite crystals do not affect the porosity, due to their particle size |  | | Journal (issue) | | Is it a place where your customers want to be? âą Do your salespeople spend 70% of their time on customersâ...customersâ rational needs or on their emotional desires? âą Do you transform the purchase experience into an experience...usually have something very specific in mind and do not want a sales pitch, while Russian shoppers tend...when the head of Paramount Pictures asked him to do it as a favor, Katz obliged, asking to receive credit...jewelry. After asking himself if he wanted to do theatrics or do business, he began to create âcontemporary |  | | Journal (article/letter/editorial) | | and sulfuric acid is formed by the oxidation of pyrite and other sulfides as the sulfides weather and...deposits in the Ametista do Sul mining district, ParanĂĄ volcanic province, southern Brazil. J. Geochem. |
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