 | 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) | | values of silica minerals in geodes (chalcedony, quartz, and amethyst) are much larger and the values generally...Uruguayan deposits than in the Ametista do Sul area of southern Brazil. The range of δ34S values (−15.0 to...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 |  | 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 (issue) | | Articles 708 Coloured Stone Mining and Trade in Brazil: A Brief History and Current Status By Aurélien...Collection V. L. Villani photo p. 758 Cover Photo: Brazil is the source of a variety of coloured stones,...(Figure 4b), spessartine (Figure 4c), almandine, quartz, zircon, apatite, topaz, sillimanite, fluorite...tourmaline (Figure 4d), aquamarine, spessartine, quartz, topaz, zircon and phenakite are mined. Tourmaline...Saint-Clair Fonseca Junior (BC Gemas do Brasil, Governador Valadares, Brazil), and heating to 500°C in air was |  | | Journal (issue) | | Is it a place where your customers want to be? • Do your salespeople spend 70% of their time on customers’...customers’ rational needs or on their emotional desires? • 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 “contemporary |  | | Book | | com/series/10172 Jens Götze Robert Möckel • Editors Quartz: Deposits, Mineralogy and Analytics 123 Editors...and reflect the state of the art in the field of quartz and silica raw materials. The book covers the broad...The chapters are dealing mainly with the mineral quartz, which is one of the most frequent minerals of...with the processing and technical application of quartz and SiO2 material. The 15 chapters of the book...exploration and qualification of potential deposits of quartz raw materials in terms of certain technical applications |  | | Journal (issue) | | Tanzania • An engraved emerald • Unusual rutilated quartz • Rubies and ruby deposits of eastern Madagascar...• Assembled diamond imitations from Brazil • Enamel-backed quartz as a star sapphire imitation • Goldschmidt...our authors and staff invested in every issue to do the research, write and refine the articles, and...treasure chest of information. But how do you access it? How do you find what you need? We are pleased...materials—new synthetic rubies, sapphires, emeralds, and quartz varieties, to name but a few. Russian high EDITORIAL |
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Salto do Jacuí, Rio Grande do Sul, Brazil