 | 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) | | stages are distinguished. In stage I, celadonite, chalcedony and pyrite formed under reducing conditions in...Province in southern Brazil (Ametista do Sul) and Uruguay (Artigas), i.e. in rocks with low silica and radioactive...Sul, Brazil, and Artigas or sometimes named âLos Catalanes gem fieldâ, northern Uruguay. They are located...2003; Rosenstengel and Hartmann 2012), while in Artigas the amethyst geodes are hosted in Ti-poor Gramado-type...districts of Ametista do Sul, Brazil, and Artigas, Uruguay (from Gilg et al. 2003) a specific level |  | 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) | | geodes in the Los Catalanes gemological district, Uruguay, southernmost ParanĂĄ volcanic province Lauren C...deposits of the Los Catalanes gemological district, Uruguay, constrain processes operative during mineral deposition...the ÎŽ18O values of silica minerals in geodes (chalcedony, quartz, and amethyst) are much larger and the...(600 tons/month) are Brazil (Ametista do Sul) and Uruguay (Los Catalanes). The cylindrical, prolate geodes...zeolites) and the late filling of geodes (mostly chalcedony, quartz, and amethyst) during silica alteration |  | | Report (issue) | | Scovil photo Upper right: Amethyst, moonstone and chalcedony circa 1910 British "suffragette" brooch; Tadema... short prismatic Ametista do Sul, Brazil Artigas, Uruguay Cavities in sedimentary rocks less than...found at La Soberana Mine in Estancia La Soberana, Uruguay. Reinhard Balzer photo Facing page, left: High-salinity...Grande do Sul, Brazil, and in neighboring Artigas, Uruguay. Other large igneous provinces related to...the amethyst geodes at Ametista do Sul and at Artigas; thus indicating that it is not the chemical composition |  | Hartmann, LĂ©o 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 MagalhĂŁes, Barboza, Eduardo GuimarĂŁes, 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 ParanĂĄ volcanic province, Brazil and Uruguay. International Geology Review, 54 (1) 1-14 doi:10.1080/00206814.2010.496253 | Journal (article/letter/editorial) | | southern ParanĂĄ volcanic province, Brazil and Uruguay a b c LĂ©o Afraneo Hartmann , Lauren da Cunha...southern ParanĂĄ volcanic province, Brazil and Uruguay, International Geology Review, 54:1, 1-14, DOI:...southern ParanĂĄ volcanic province, Brazil and Uruguay LĂ©o Afraneo Hartmanna *, Lauren da Cunha Duarteb...South America, not only in Brazil but also in Uruguay, Argentina, and Paraguay (Bellieni et al. 1984)...from Ametista do Sul (Brazil) and Los Catalanes (Uruguay), with commerce concentrated in Soledade, Brazil |  | | Journal (article/letter/editorial) | | W ord to the Wise Geode JOHN RAKOVAN Department of Geology and Environmental Sciences Miami University...sometimes incomplete outermost primary layer of dense chalcedony, by a cavity that is partly filled by a drusy...2. A 9-cm sedimentary geode, with a very thin chalcedony rind, lined with a druse of small quartz crystals...9-cm igneous (volcanic) geode, with a thicker chalcedony rind (agate) than seen in figure 2, lined with...volcanic igneous rocks. The initial precipitation of chalcedony (cryptocrystalline quartz) is followed by macrocrystalline |  | | Report (issue) | | groups; drusy, ÂŻne-grained to microcrystalline (\chalcedony"), massive. Twinning: Very common, penetration...Sul, Minas Gerais, Goi¶as, and Bahia. Around Artigas, Uruguay. At Thunder Bay, Lake Superior, Ontario, Canada |  | 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) | | 15126 Athens, Greece; dimitrisal@hotmail.com Department of Earth Sciences, St. Francis Xavier University...Colloformâcrustiform banding with alternations of amethyst, chalcedony and/or carbonates is a common characteristic...Other amethyst producing countries are Mexico, Uruguay, Canada, South Korea, Russia, Zambia, Sri Lanka...back-scattered imaging capabilities, respectively, at the Department of Mineralogy and Petrology at the University...were carried out at the University of Athens, Department of Geology, using a JEOL JSM 5600 scanning electron |  | 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) | | 80337 MuÌnchen, Germany I. Gatter Mineralogical Department, EoÌtvoÌs University, PaÌzmaÌny PeÌter SeÌtaÌny...Budapest, Hungary A.J. Strieder Mining Engineering Department, Federal University of Rio Grande do Sul, Oswaldo...rocks, or geodes in basaltic lavas. Brazil and Uruguay are the world leaders in the production of gem...The Uruguayan amethyst deposits are located at Artigas in the northwestern part of the state near the...Bossi (1993) suggested that geode formation in Uruguay is related to fusion or dissolution of sandstone |  | | Show/Event (guide) | | BECKER STONES LLC Carlos Catala 372 Artigas, Artigas 55000 Uruguay Tel: +5-984-773-1666 www.beckerstones...Booth#: TNW1 Amethysts and other raw materials from Uruguay. BEST IN GEMS, INC. 6724 Perimeter Loop Rd. #307...PANIZZA MINERALS LLC Juan B. Torrej 456 Artigas, Artigas 55000 Uruguay Tel: +5-989-951-7047 Booth#: TNW3...URUMINING S.A Av. Rivera 7918 Carasco, Canelones Uruguay Tel: +59-895-210-179 http://www.urumining.com.uy...TW10, TW12 Amethysts, meteorites and geodes from Uruguay. LIST OF EXHIBITORS SPENCER OPAL MINES 27 Opal |  | 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, ParanĂĄ volcanic province, Brazil. Ore Geology Reviews, 66. 243-251 doi:10.1016/j.oregeorev.2014.11.005 | Journal (article/letter/editorial) | | gemological district in Uruguay. The volcanic province covers 915,000 km2 in Brazil, Uruguay, Argentina and Paraguay...type of the mineralized CatalĂĄn andesite ïŹow in Uruguay. The CatalĂĄn ïŹow lies directly over the Botucatu...geode; C = water, air; cel = celadonite, chalc = chalcedony, cl qz = clear quartz, ameth = amethyst, mc cr...geodes from Los Catalanes gemological district, Artigas, Uruguay, southern ParanĂĄ Magmatic Province. J. Volcanol...geodes in the Los Catalanes gemological district, Uruguay, southernmost ParanĂĄ volcanic province. Mineral |  | | Catalog/List | | concentrate on Brazil and Peru with occasional trips to Uruguay, Chile, and Colombia. Besides buying, he started...Nikolaevskiy Mine, Dalnegorsk, Russia, 1993. "RPG," Artigas, Uruguay, acquired 2008. RHC #8000. Record and Rocks.............................................198 Uruguay .................................................block show the natural contact of the vein of chalcedony. It is not as good as the one in the Richard...often and are friends with the local sherifâs department. You igure the odds of extracting any more specimens |  | Götze, Jens, Hofmann, Beda, MachaĆowski, Tomasz, Tsurkan, Mikhail V., Jesionowski, Teofil, Ehrlich, Hermann, Kleeberg, Reinhard, Ottens, Berthold (2020) Biosignatures in Subsurface Filamentous Fabrics (SFF) from the Deccan Volcanic Province, India. Minerals, 10 (6) 540 doi:10.3390/min10060540 | Journal (article/letter/editorial) | | (Ca-rich zeolites) and finally pure SiO2 (opal-CT, chalcedony, and macro-crystalline quartz). Assuming biological...unnoticed, other largealthough flood basalt So-called chalcedony-amethyst stalactites were remain largely theyprovinces...in remarkable found the amethyst geodes of Artigas in Uruguay [6] and pseudo-stalactite aggregatesparts...So-called chalcedony-amethyst stalactites were found in the amethyst geodes of Artigas in Uruguay [6] and...sequences. In a second stage, calcite, zeolites, and chalcedony crystallized due to low-grade metamorphism during |  | | Journal (article/letter/editorial) | | photo. July/August: Amethyst and calcite, Artigas, Uruguay. Rock Currier specimen, Jeff Scovil photo...New Hampshire, 416 Chalcanthite, Colorado, 3 10 Chalcedony,Missouri, 230; Utah, 244 Chalcocite, Colorado |  | 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) | | stilbite) as well as plagioclase was overgrown by chalcedony, and finally a second calcite (II) and zeolite...characterized encrusted by chalcedony, unusual twinned calcite crystals, and encrusted chalcedony, unusual twinned...subsurface filamentous fabrics (SFFs) overgrown chalcedony SuperbMinerals MineralsPvt. Pvt. Ltd, Ltd, Nashik...Nashik, Nashik, India). I) I) crystals onon by by chalcedony (©(©Superb India).(b) (b)Twinned Twinnedcalcite...calciteI (Cal I (Cal crystals basalt overgrown by chalcedony and later on by yellowish calcite II (Cal II) |  | | Catalog/List | | Heritage Auctions, Inc. 15021 Natural History Department Steve Ivy CEO Co-Chairman of the Board David...Courtney Case, Ext. 1293 CourtneyC@HA.com Credit Department Marti Korver, Ext 1248 Marti@HA.com Michael... 38002ââ AMETHYST CAST AFTER CALCITE Artigas, Artigas Department, Uruguay Perched on top of a mound of rich...âPORTA JOIAâ WITH CALCITE CRYSTAL Artigas, Artigas Department, Uruguay A âporta joiaâ is a âjewel boxâ...crystals, this very large âporta joiaâ comes from Artigas, Uruguay. Included within this âdiamondâ shaped geode |  | | Journal (article/letter/editorial) | | University of Idaho, Moscow, Idaho 83844-2339, U.S.A. Department of Geological Sciences, University of Idaho,...secondary alteration minerals including quartz, chalcedony, opal, calcite, nontronite, saponite, and zeolites...cavities were filled with other minerals including chalcedony, opal, and a zeolite. These mineralogical observations...(2010) The genesis of the amethyst geodes at Artigas (Uruguay) and the paleohydrology of the GuaranĂ aquifer: |  | | Catalog/List | | grey matrix. 2 "x2~" . ÂŁ12 . 00 AMETHYST . Artigas, Uruguay. Specimen A-Rich deep purple crystals on a...and hor i zontally striated l!xa" .· ÂŁ12 .00 CHALCEDONY . a fter octahedral fl uorite. Hheal Mary Ann |  | | Journal (article/letter/editorial) | | province, occurring mostly in Brazil but also in Uruguay, Argentina, and Paraguay (Figure 1). The volcanic...extent. A basalt breccia with sandstone matrix and chalcedony cement commonly underlies and merges into the...flow, e.g. Los Catalanes gemological province, Uruguay, and QuaraĂ mining province, Brazil, and also at...detrital quartz grains and the filling of pores with chalcedony. The upper portion (10â20 cm) of the Chal-Chal...geodes in the Los Catalanes gemological district, Uruguay, southernmost ParanĂĄ volcanic province: Mineralium |  | | Report (issue) | | ' AGATE. URUGUAY. ARTIFICIALLY COLORED. Field Museum of Natural History DEPARTMENT OF GEOLOGY Chicago...AgateâPhysical 8 Properties and Origin a variety of chalcedony chiefly distinits banded or variegated structure...Brazil, to the district of Salto in northern Uruguay. The agates of this region surpass in size and...purposes. A portion of the agate-bearing area in Uruguay was visited in 1926 by Associate Curator H. W....at present are in the Catalan district of Artigas, Uruguay, which is about one hundred miles north of |  | Fritsch, Emmanuel, Rondeau, Benjamin, Devouard, Bertrand, Pinsault, Lauriane, Latouche, Camille (2017) Why Are Some Crystals Gem Quality? Crystal Growth Considerations On the âGem Factorâ. The Canadian Mineralogist, 55 (4) 521-533 doi:10.3749/canmin.1700013 | Journal (article/letter/editorial) | | polycrystalline, massive ones (turquoise, opal, chalcedony, lapis lazuli, or jadeite, for example). It is...geodes from Los Catalanes gemological district, Artigas, Uruguay, southern ParanaÌ Magmatic Province. Journal...geodes in the Los Catalanes gemological district, Uruguay, southernmost Parana volcanic province. Mineralium |  | | Journal (article/letter/editorial) | | specimens have been found in Gachala, Cundinamarca department (Colombia), formed by two crystals twinned according... The specimens from the Chessy mine in Rhone department (France) have been known for a long time, probably...amethyst geodes of the Rio Grande do Sul/Artigas area (Brazil and Uruguay). Specimens of this pseudomorph began...literature were those formed by opal (and/or chalcedony) pseudomorphs after calcite 26 MINERAL up, Volume...points out the existence in Cerro AlmodĂłvar of Chalcedony and opal, pseudomorphs after calcite. Cerro de |  | | Journal (issue) | | .......................................... 55 Uruguay .................................................material was said to have been found in Paraguay, Uruguay, or Matto Grosso do Sul in Brazil. A mix of cut...has deposits of fire opal, agate, aquamarine, chalcedony, chrysophrase, emerald, garnet, jasper, obsidian...pal is found in the town of Erandique in the department of Lempira, near the Salvadoran border in southwestern...quartz, rock crystal, and amethyst. Furthermore, chalcedony varieties are being reported, but not in significant |  | | Catalog/List | | LARGE AMETHYST GEODE: âMICKEY MOUSEâ Artigas, Artigas Department, Uruguay The term âPorta Joiaâ in Portuguese...JOIAâ Artigas, Artigas Department, Uruguay The finest Amethyst geodes are said to come from Artigas, Uruguay...RHODOCHROSITE SLAB Capillitas Mine, AndangalĂĄ Department, Catamarca, Argentina The banded Rhodochrosite...RHODOCHROSITE SLAB Capillitas Mine, AndangalĂĄ Department, Catamarca, Argentina As mentioned in connection...RHODOCHROSITE SLAB Capillitas Mine, AndangalĂĄ Department, Catamarca, Argentina For those who were wondering |  | | Catalog/List | | Provenance: Western Minerals, ex. University of Chicago Department of Geological Sciences [Hoppel # D1159] Estimate:...AMETHYST Artigas, Artigas Department, Uruguay Before the Amethyst geodes of Brazil and Uruguay begin to...12:00 PM CTââ 143 53167 AMETHYST Artigas, Artigas Department, Uruguay Experts agree: the best Amethyst...Cerro de PotosĂ (Cerro Rico), PotosĂ City, PotosĂ Department, Bolivia Although there are legitimate grounds...Pachapaqui District, Bolognesi Province, Ancash Department, Peru Rounded âcloudsâ of pink Manganoan Calcite |  | | Catalog/List | | Kevin 67 Native Lima Ex Silver on Matrix. Department, Edu âar Estimated qt [ at id From the... vith Province, 1 - 1.5 cm Lima calcite Department, Peru; mea O00. / a, } n mining (the...Chivor, displays Boyaca beautifully, front Department, or a deep emerald bac k. Colombia; by 2...side lhe wire left size of all Mine, Boya« a Department, Colombia; measures 2.6 cm From the Elura...aesthetic silvers we From Llallagua, Potosi Department, Bolivia; measures 7 cm by 8.6 cm. Estimated |
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Artigas, Artigas Department, Uruguay