 | | Journal (article/letter/editorial) | | john@jwkustos.com Figure 2. A skunk from Artigas, Uruguay, in which the amethyst crystals are aligned...Minerals. This amethyst on calcite skunk from Artigas, Uruguay, is certainly one of the finest examples known...3a and 3b. Amethyst on calcite skunk from Artigas, Uruguay. The specimen is 9.5 cm high. John S. White...photos. Figure 4. Large plate of amethyst from Artigas, Uruguay, with a pair of skunks showing subsequent...2015 Figure 8a Figure 8b cality known as Artigas, Uruguay; both localities occur in Lower Cretaceous |  | | Report (issue) | | 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...expandable interstratified clay minerals, and goethite, indicate that the minerals crystallized in the |  | 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) | | bacteria. During the subsequent stages II (amethyst, goethite and anhydrite), III (early Editorial handling:...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 “Los Catalanes gem field”, 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 |  | | Catalog/List | | and finally terminating in yellow colored by goethite or rutile inclusions. This crystal was discovered...Municipality, Western Boyacá Province, Boyacá Department, Colombia 16 cm tall x 14.5 cm wide 38 39...Calcite on Amethyst with Chalcopyrite, Artigas, Artigas Department, Uruguay 16 cm tall x 26.8 cm wide 43 |  | | 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 .................................................often and are friends with the local sherif’s department. You igure the odds of extracting any more specimens...of associated minerals found there, followed by Goethite. After that, things get much rarer: things like |  | 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 München, Germany I. Gatter Mineralogical Department, Eötvös University, Pázmány Péter Sétány...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 |  | | Journal (article/letter/editorial) | | others (e.g., native copper after cuprite and goethite after pyrite). In both cases, the crystal form...seemingly endless amethyst geode deposits in Artigas, Uruguay, and Rio Grande do Sul, Brazil. In those examples |  | Voudouris, Panagiotis, Melfos, Vasilios, Mavrogonatos, Constantinos, Tarantola, Alexandre, Gӧtze, 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...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...coupled to a Leitz SM-LUX-POL microscope at the Department of Mineralogy, Petrology and Economic Geology |  | | Journal (article/letter/editorial) | | Scovil photo. MarcWApril: Amethyst and calcite, Artigas, Uruguay. Rock H. Currier specimen, Harold and Erica...Jeff Scovil photo. Adularia, Michigan, I10 Agate, Uruguay, 94 Ajoite, Arizona, 23 Albite, California, 156;...46 Amethyst, Agate, and Calcite “Skunks” from Uruguay, R. H. Currier, 94-105 Ankerite, Missouri, 421;...Michigan, 110; Missouri, 370-77, 379-82, 404, 421; Uruguay, 94: Wiscon- sin, 346 Caledonite, Arizona, 26...H., Amethyst, Agate, and Calcite ‘Skunks” from Uruguay, 94-105; Calcite and Marcasite Specimens from the |  | 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) | | Paraná volcanic province are also enriched in goethite-limonite, clay minerals and silica (silicified...of 917,000 km2 (Frank et al., 2009) in Brazil, Uruguay, Argentina and Paraguay (Fig.1) with a lava volume...Ametista do Sul in Brazil and Los D Catalanes in Uruguay (Juchem et al., 2010; Silva, 2010). Native copper...Studies carried out in Quaraí (Brazil) and Artigas (Uruguay) in basaltic andesites IP showed the occurrence...principal CE P mineral together with plagioclase, goethite, kaolinite and zeolites. The XRD analysis of oriented |  | | Journal (article/letter/editorial) | | photo. July/August: Amethyst and calcite, Artigas, Uruguay. Rock Currier specimen, Jeff Scovil photo...Cryo-Genie Mine, San Diego County, California, 156-68 Goethite, Missouri, 227; New Hampshire, 416 Gold, Colorado |  | Fritsch, Emmanuel, Rondeau, Benjamin, Devouard, Bertrand, Pinsault, Lauriane, Latouche, Camille (2017) Why Are Some Crystals Gem Quality? Crystal Growth Considerations On the “Gem Factor”. The Canadian Mineralogist, 55 (4) 521-533 doi:10.3749/canmin.1700013 | Journal (article/letter/editorial) | | 530 THE CANADIAN MINERALOGIST FIG. 9. These goethite (yellow) and hematite (red) discoidal inclusions...discoids. For example, discoids of hematite and goethite in fractures of rock crystal quartz from Brazil...geodes from Los Catalanes gemological district, Artigas, Uruguay, southern Paraná Magmatic Province. Journal...geodes in the Los Catalanes gemological district, Uruguay, southernmost Parana volcanic province. Mineralium |  | | Catalog/List | | Kevin 67 Native Lima Ex Silver on Matrix. Department, Edu ‘ar Estimated qt [ at id From the...Kevin Ward Collection. OKY QUARTZ, AMAZONITE, and GOETHITE ps. SIDERITE _ Ken's Pocket, Two Point Claim...Kevin Ward — Smoky Quartz on Amazonite with Goethite PS Siderite Crystals. An awesome superb plate...plate of smoky quartz on amazonite with goethite pseudomorph siderite crystals. The color of the amazonite... The brownish crystals to the upper right are goethite pseudomorphing siderite crystals. A very impressive |  | | Journal (article/letter/editorial) | | long time are the ones formed of iron oxides (goethite mainly) produced by alteration of pyrite crystals... and how they vary over time. Pseudomorphs of goethite after pyrite are extraordinarily common. Recently...specimens have been found in Gachala, Cundinamarca department (Colombia), formed by two crystals twinned according...erosion. Although less common, pseudomorphs of goethite after marcasite crystal clusters have been found... The specimens from the Chessy mine in Rhone department (France) have been known for a long time, probably |  | Götze, Jens, Hofmann, Beda, Machałowski, 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) | | in remarkable found the amethyst geodes of Artigas in Uruguay [6] and pseudo-stalactite aggregatesparts...stalactites were found in the amethyst geodes of Artigas in Uruguay [6] and pseudo-stalactite aggregates were...nano-scale minerals such as montmorillonite and goethite in soils (Aspergillus fumigatus Z5) [100–103]...H.A. The genesis of the amethyst geodes at Artigas (Uruguay) and the paleohydrology of the Guaraní aquifer:...Fungal biomineralization of montmorillonite and goethite to short-range-ordered minerals. Geochim. Cosmochim |  | | Journal (article/letter/editorial) | | specimen material on the market from Brazil and Uruguay. In recent years, however, the presence of quality...Amethyst Mine Confirmed Calcite (5) Kaolinite (3) Goethite (5) Hematite (4) Pyrite (5) Quartz; Quartz v....Smectite (3) Presumptive Confirmation Azurite (5) Goethite (5) Limonite (5) Malachite (5) Unconfirmed Chlorite... Pb = 47.2 atom %, and minor Fe = 2.1 atom %. Goethite, FeO(OH), was reported from the Diamond Willow...phases of iron oxide, including lepidocrocite or goethite, or various amorphous hydrous iron oxides referred |  | | Catalog/List | | LARGE AMETHYST GEODE: “MICKEY MOUSE” Artigas, Artigas Department, Uruguay The term “Porta Joia” in Portuguese...JOIA” Artigas, Artigas Department, Uruguay The finest Amethyst geodes are said to come from Artigas, Uruguay...RHODOCHROSITE SLAB Capillitas Mine, Andangalá Department, Catamarca, Argentina The banded Rhodochrosite...RHODOCHROSITE SLAB Capillitas Mine, Andangalá Department, Catamarca, Argentina As mentioned in connection...RHODOCHROSITE SLAB Capillitas Mine, Andangalá Department, Catamarca, Argentina For those who were wondering |  | | Journal (issue) | | Following discussions with the m useum’s Publications Department it was con cluded that a less technically ambitious...with willemite, wulfenite and pyromorphite. 7 Goethite FeO(OH) Linarite PbC u(S04)(0 H )2 M olybdofomacite...second generation of minerals include coronadite, goethite, covellite, an glesite, cerussite, brochantite...Gold Hematite Silver Barite Quartz Coronadite Goethite Covellite Anglesite Willemite Cerussite Murdochite...Benjamin B. Burbank1 Voluntary Curator of Minerals Department of Geology Bowdoin College Brunswick, Maine 04011 |  | | Catalog/List | | 53112 GOETHITE Sentinel Rock (Specimen Rock), Pikes Peak, El Paso Co., Colorado, USA “Goethite” is a...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 CT 143 53167 AMETHYST Artigas, Artigas Department, Uruguay Experts agree: the best Amethyst...Cerro de Potosí (Cerro Rico), Potosí City, Potosí Department, Bolivia Although there are legitimate grounds |  | Chaillou, Gwénaëlle, Schäfer, Jörg, Anschutz, Pierre, Lavaux, Gilbert, Blanc, Gérard (2003) The behaviour of arsenic in muddy sediments of the Bay of Biscay (France) Geochimica et Cosmochimica Acta, 67 (16) 2993-3003 doi:10.1016/s0016-7037(03)00204-7 | Journal (article/letter/editorial) | | organic matter or more crystalline Fe-oxides (e.g., goethite) associated to a release of dissolved Fe as suggested...Michel P., Boutier B., Herbland A., Averty B., Artigas L. F., Auger D., and Chartier E. (1997) Behaviour |  | | Book | | Amethysten aus den Basalten Südbrasiliens und von Uruguay. Es handelt sich dabei um weiße Halbkugeln, die...amethyst from basalts in southern Brazil or northern Uruguay are white hemispheres up to about 1 cm diameter...Amethyst. Artigas, Uruguay. Breite 1,8 cm. Fluorite balls in amethyst from Artigas, Uruguay. Width 1.8...many quartz varieties. e most common ones are goethite, hematite, ilmenite and rutile. These minerals...identified in amethyst from basalts in Brazil and Uruguay (see more underfluorite). Columbite group Seite |  | | Journal (article/letter/editorial) | | chlorite, and quartz but by negligible amounts of goethite and gypsum. Concentrations normalized to the post-Archaean...specific mineral species (e.g. hematite and/or goethite). These particles are important constituents of...Kaol, kaolinite; Gyp, gypsum; Qtz, quartz; Goeth, goethite; MM, micas/clay minerals (10Å minerals). other...negligible amounts of iron oxides-hydroxides (such as goethite) and gypsum are also present in a few samples..., Barrenechea, J.F., Alonso-Azcarate, J., and Artigas, R., 2003, Sandstone petrography of continental |  | | Journal (issue) | | Koivula is chiel gemologist in the Research Department of the Gemological Institute of America, Santa...Beers Synthetic Diamonds T he GIA Research Department recently examined a group of 14 gem-quality synthetic...of America, Santa Monica, CA. The GIA Research Department was also extremely helpful. 01988 Gemological...observed by Jack Lowell i n some amethysts from Artigas, Uruguay, has never been described before. Magnified...previously unreported, phenomenon in amethyst from Artigas, Uruguay. This adularescence-like phenomenon (figure |  | | Journal (issue) | | aroused, Feeney sent the specimen to the State Department of Mines in Sydney for identification. It was...and E. C. Andrews, Geological Surveyor N.S.W. Department of Mines, in the cut adjoining Goodwin’s pipe...pipe, Glen Innes Gully. Photo courtesy Department of Mineral Resources, N.S.W. Government. put through a...Wright), in his report to the New South Wales Department of Mines for 1919, disclosed plans to connect...quartz. As early as 1926, the New South Wales Department of Mines had found that limited amounts of this |  | | Journal (issue) | | Director of the Conservation Education and Science Department; Anna Domitrovic (right), Mineral Curator Emeritus;... Arizona. Dale Armstrong photo. Jarosite and goethite pseudomorph after pyrite with andradite, 10 cm...photo. Azurite crystals to 6 cm on malachite and goethite, from the Gardner mine. M. J. Cunningham collection;...Historical Museum specimen. BMHM photo. Stalactites of goethite partially coated by white gibbsite, with malachite...Record, May-June 2013 Calcite with malachite on goethite, 12.7 cm, from the Czar mine. James Douglas collection; |
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