 | | Journal (article/letter/editorial) | | Silver Mining Camp in Colorado T he Creede mining district, located at a lofty elevation of 10,000 feet,...that would later be known as the Amethyst vein system (a.k.a. Amethyst fault system), host to such well-known...well-known mines as the Amethyst, Last Chance, Commodore, and Bachelor. The mining encampment grew from...County, was the center of mining activities for the district and from 1891 through 1985 produced 85.7 million...Creede mining district showing the main silver-bearing veins and the major mines of the district. Cartography |  | | Journal (issue) | | vary for agates in volcanic rocks, hydrothermal vein agate or sedimentary agates (Götze, 2011). Many...calcite has been formed as overgrowths on quartz or chalcedony in the central part of the agate geodes (Fig...(Fig. 1a), but calcite layers intergrown with chalcedony are also possible (Fig. 1b). A special case is the...marginal parts of the agates as well as within the chalcedony matrix cause the typical colorations in red,...between host rock and agate or in the outermost chalcedony layer (Fig. 2a/b). The crystals show spherulitic |  | | Report (issue) | | of America PHOTO CREDITS Cover: Quartz variety amethyst, 10.5 cm tall Goboboseb Mountains, Erongo Region...collection, Jeff Scovil photo Title (facing) Page Amethyst mouse with gold tail, 130 grams, 6.3 cm wide Carved...Brazilian amethyst Private collection, Robert Weldon photo © 2009 GIA Page 2 Quartz variety amethyst, 3.5...3, Table of Contents Insets Top: Circa 212 CE amethyst intaglio bearing the portrait of Roman Emperor...Marie-Lan Nguyen photo Upper middle: Quartz variety amethyst (Japan-law twin), 1.6 cm tall Andilamena, Toamasina |  | | Journal (article/letter/editorial) | | Bulldog Mine) A Legacy Rich In Silver Creede Mining District, Mineral County, Colorado, USA By Ken Kucera ...baryte, galena, sphalerite, and quartz variety amethyst. Table of Contents 2 Introduc�on 5 Loca�on...Mine 41 Appendix - Geology & Mineralogy Creede District 44 References In January 1985, after producing...of mining ended in the renowned Creede Mining District. On August 5, 1992, Homestake Mining Company,...historically important silver mine in the Creede Mining district, Mineral County, Colorado, known as the Bulldog | | | Journal (article/letter/editorial) | | Bulldog Mine) A Legacy Rich In Silver Creede Mining District, Mineral County, Colorado, USA By Ken Kucera ...baryte, galena, sphalerite, and quartz variety amethyst. Table of Contents 2 Introduc�on 5 Loca�on...Mine 41 Appendix - Geology & Mineralogy Creede District 44 References In January 1985, after producing...of mining ended in the renowned Creede Mining District. On August 5, 1992, Homestake Mining Company,...historically important silver mine in the Creede Mining district, Mineral County, Colorado, known as the Bulldog |  | | Journal (article/letter/editorial) | | Bulldog Mine) A Legacy Rich In Silver Creede Mining District, Mineral County, Colorado, USA By Ken Kucera ...baryte, galena, sphalerite, and quartz variety amethyst. Table of Contents 2 Introduc�on 5 Loca�on...Mine 41 Appendix - Geology & Mineralogy Creede District 44 References In January 1985, after producing...of mining ended in the renowned Creede Mining District. On August 5, 1992, Homestake Mining Company,...historically important silver mine in the Creede Mining district, Mineral County, Colorado, known as the Bulldog | | | Journal (article/letter/editorial) | | Bulldog Mine) A Legacy Rich In Silver Creede Mining District, Mineral County, Colorado, USA By Ken Kucera ...baryte, galena, sphalerite, and quartz variety amethyst. Table of Contents 2 Introduc�on 5 Loca�on...Mine 41 Appendix - Geology & Mineralogy Creede District 44 References In January 1985, after producing...of mining ended in the renowned Creede Mining District. On August 5, 1992, Homestake Mining Company,...historically important silver mine in the Creede Mining district, Mineral County, Colorado, known as the Bulldog |  | | Catalog/List | | some galena in the matrix, Bleiberg Carinthia Austria ( one of the most famous European mines) £20 Min...matrix with minor Hydrozincite Bleiberg Carinthia Austria £6 20. HUNTITE white chalky massive areas coating...Arizona, £15 32. CHALCEDONY off white botryoidal over a good part of2x3 thin matrix, with vein of Psilomelane...green coating on lxl.5 inch quartz (Schwaz Inntal Austria) £7 35. CASSITERITE super lustrous black intergrown...3x2 and about one inch thick. £5 AMETHYST vein section of pure amethyst 2x2.5 Park pit Bodmin Moor Cornwall |  | | Journal (article/letter/editorial) | | Collecting Microminerals in the Creede Mining District The Amethyst, Commodore No. 5 Mineral County, Colorado...the Creede district was at the Holy Moses mine high above East Willow Creek, but the district did not prosper...made along West Willow Creek on the Amethyst vein system. The Amethyst and Commodore No. 5 mines are located...Commodore mine perched on the mountainside. The Amethyst mine is north of the Commodore mine, and most...the P and OH veins that are adjacent to the Amethyst vein system. Arthur E. Smith, a consulting editor |  | 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) | | minerals Article Amethyst Occurrences in Tertiary Volcanic Rocks of Greece: Mineralogical, Fluid Inclusion...Epithermally altered volcanic rocks in Greece host amethyst-bearing veins in association with various silicates...alternations of amethyst, chalcedony and/or carbonates is a common characteristic of the studied amethyst-bearing...propylitic and zeolitic types. Precipitation of amethyst took place from near-neutral to alkaline fluids...Fluid inclusion data suggest that the studied amethyst was formed by hydrothermal fluids with relatively |  | | Report (volume) | | 718 GEOLOGY AND ORE DEPOSITS OF THE ' CREEDE DISTRICT, COLORADO BY WILLIAM H. EMMONS AND ESPER S................................................. Amethyst mill............................................................................ 61 61 62 62 Lower member.................................................................................... 88 Amethyst fault system................................................................................ Chalcedony............................................. |  | | Journal (issue) | | Fallon, Nevada. —Bob Rush Bench Tips columnist Chalcedony Canvas Today, I gave a presentation to a group...iron oxide impurities made the original clear chalcedony red, I added that other impurities result in... Another way to look at it is that the clear chalcedony is essentially a new canvas for “painting”. —Lou...with quartz from the Herodsfoot mine (Liskeard district, Cornwall). BOB JONES IROCKS.COM WIKIPEDIA...eyes, in a Minnesota winter. Next, the calcite chalcedony and hematite.” and outer agate banding, plus |  | | Catalog/List | | matrix with minor Hydrozincite Bleiberg Carinthia Austria £6 23. HUNTITE white chalky massive areas coating...Arizona, £15 35. CHALCEDONY off white botryoidal over a good part of2x3 thin matrix, with vein of Psilomelane...and about one inch thick. £5 70. AMETHYST vein section of pure amethyst 2x2.5 Park pit Bodmin Moor Cornwall |  | | Journal (article/letter/editorial) | | Environment of Ore Deposition in the Creede Mining District, San Juan Mountains, Colorado: Part VI. Maximum...Maximum Duration for Mineralization of the OH Vein WAYNE R. CAMPBELL AND PAUL B. BARTON† U.S. Geological Survey...the epithermal silver-lead-zinc deposit in the OH vein at Creede, Colorado. Two initial textures are considered:...paper deals with a single vein from a productive epithermal deposit, the OH vein at Creede, Colorado. For...evidence that the ore-forming system for the OH vein was other than a single, complex, and evolving hydrothermal |  | 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) | | investigation of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost...of the world-class amethyst-geode deposits of the Los Catalanes gemological district, Uruguay, constrain...geodes (chalcedony, quartz, and amethyst) are much larger and the values generally somewhat lower (21.2–31... Introduction The largest world producers of amethyst and agate geodes (600 tons/month) are Brazil (Ametista...deposit geology. In the Serra Geral Group, giant amethyst geodes and agate geodes occur in volcanic rocks |  | | Journal (article/letter/editorial) | | mine, Bald Mountain, Caribou area, Grand Island district, Boulder County. Specimen owner anonymous. Downloaded...high, Midnight mine, Richmond Hill area, Aspen district, Pitkin County. Specimen owner anonymous. Figure... Mollie Gibson mine, Smuggler Mountain, Aspen district, Pitkin County. Specimen 4.5 cm tall. Specimen... Mollie Gibson mine, Smuggler Mountain, Aspen district, Pitkin County. Specimen approximately 5 cm tall...Natural History. Figure 7: Silver wires, Aspen district, Pitkin County. Specimen approximately 4 cm tall |  | | Journal (issue) | | Tour loop showcases 17 miles of the old mining district and spectacular mountain scenery. fter the ores...Creede’s attractions include a historic mining district with an underground-mine tour and an underground...S U RV I VOR solidified into massive veins of chalcedony, banded agate, amethystine quartz, native silver...indicated large, continuous vein systems. After tracing the largest vein on the surface for more than...than two miles, they named it the Amethyst Vein after its primary component—distinctive, lavender-colored |  | Foley, Nora K., Caddey, Stanton W., Byington, Craig B., Vardiman, David M. (1993) Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado. Professional Paper 1537. US Geological Survey doi:10.3133/pp1537 | Report (issue) | | Gold, Silver, and Base-Metal Ores of the North Amethyst Vein System, Sari Juan Mountains, Mineral County...Gold, Silver, and Base-Metal Ores of the North Amethyst Vein System, San Juan Mountains, Mineral County,...PROFESSIONAL PAPER 1537 A study of progressive vein-related mineralization of structures in volcanic...gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County,.................................................. Vein Mineralogy and Compositional Ranges ........... |  | | Journal (issue) | | from Washington State, USA Copper Minerals in Chalcedony from Indonesia b THE JOURNAL OF GEMMOLOGY...on display at the Imperial Treasury Vienna in Austria. As part of an interdisciplinary research project...Holy Roma of n Empire (Part 1) / No. 5 / 2023 Amethyst/Carnelian Association from Madagascar | Aquamarine...Williams and George R. Rossman Copper Minerals in Chalcedony from Obi Island, Indonesia 512 By Joel Ivey...COLOURED STONES Unusual Amethyst and Carnelian Association from Madagascar Amethyst has long been a popular |  | | Book (edition) | | ........................................... . Amethyst ............................................................ _.... , .... _. ______ Ledbetter amethyst mine ...........................................but the quantity of gems to be expected from tho vein is still a matter of doubt. Further prospecting...gray and white matrix, consisting in pa.rt of chalcedony. The replacement of different parts of the bone...from other localities. NEVADA. Specimens of chalcedony and agate were kindly sent to the Survey by |  | | Report (issue) | | picture of a highway restaurant at Sibley. (ii) AMETHYST DEPOSITS OF ONTARIO by M.A. Vos Geological Guidebook...purpose of this guidebook is to give an account of amethyst, describing its properties, lore, uses as a gemstone...purple coloured robes. Ontario has recently1 chosen amethyst, the purple variety of quartz, to be the official...of the clear crystal referred to in names like Amethyst Bay in Thunder Bay or Quartz Lake in Maria Township...Ontario place names: agate is used eleven times; amethyst is used five times; flint is used nine times; |  | | Journal (article/letter/editorial) | | transparency and include rock crystal (colorless), amethyst (violet to purple), smoky (light to dark brown)...concentric, variety of chalcedony (composed of alternating layers of chalcedony having differ ent colors)...moss or plumelike growths. O n y x is a layered chalcedony similar to agate, except that the bands are straight...translucent chalcedony, the color being due to iron impurities; s a r d is a brown chalcedony. C h r y s...s o p r a s e is an apple green variety of chalcedony that is colored by nickel oxide. J a s p e r is |  | | Book | | Shaomin Lei Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China) Reprinted...Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2 SO4 and NH4 Cl as Leaching Agents...Dimitrios Alfieris, Victoria Maneta and Ioannis Psimis Amethyst Occurrences in Tertiary Volcanic Rocks of Greece:...(SLMS). He was guest lecturer at universities in Austria, Brazil, Norway, Italy, Poland, Spain, and Russia...modifications and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following the fundamental idea |  | | Book | | Shaomin Lei Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China) Reprinted...Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2 SO4 and NH4 Cl as Leaching Agents...Dimitrios Alfieris, Victoria Maneta and Ioannis Psimis Amethyst Occurrences in Tertiary Volcanic Rocks of Greece:...(SLMS). He was guest lecturer at universities in Austria, Brazil, Norway, Italy, Poland, Spain, and Russia...modifications and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following the fundamental idea |  | | Book | | minerals and gemstones (of the latter garnet, amethyst and jasper are typi cal). The mines do not need...chite. torbernite, cuprite, are but a few; and amethyst and jasper are not rare. Wheal Gorland (O.S. map...concen tration is to the west, in the Tavistock district. Singling out a couple at random, South Tamar...china clay pits often provide good quartz and amethyst crystal groups, as well as turquoise, wavellite...easily picked up. In Dorset, at Charmouth, bluish chalcedony is to be found in geodes along with pyrite and |
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