 | | Catalog/List | | spessartine crystals scattered over Orthoclase and Albite crystals. Quite attractive near Yunxiao, Fujian...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...botryoidal over a good part of2x3 thin matrix, with vein of Psilomelane.(Manganese mine, Socorro County,...green coating on lxl.5 inch quartz (Schwaz Inntal Austria) £7 35. CASSITERITE super lustrous black intergrown |  | | 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....................................Extent of Amethyst vein before erosion............................. 132 Gases in Amethyst lode...... |  | | Report (issue) | | this report to other talks in the series or to district geological features may be unfamiliar to the reader...recharged from highlands in the northern parts of the district and from the Creede caldera moat to the south...water, and organic species in solution. During the lower temperature waxing and waning stages of the system...the upwelling plume. In their studies of the OH vein, Paul Barton and Phil Bethke proposed that the redox...of the hydrothermal fluids were buffered by the vein assemblage chlorite, pyrite and hematite, and that |  | | 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 |  | | Thesis/Dissertation | | TDfl SbQ AEEAL GEOLOGY OF 0?HS CREEDE DISTRICT, COLORADO. By ' X ESEBR S* H B LARSEIT. ...Approved: The Areal Geology of The Greede Mining District, Esper 3. Larson. COKTEIIT3 Chapter I. ...11 General conditions 11 Humphreys mill 13 Amethyst mill 15 Solomon mill 16 Hidge mill 16 Bibliography...the rocks 21 The Potosi volcanic series 22 Lower division Upper division The Creede formation The...structure 28 782075 Chapter III. Bocks of the lower division of the Potosi . volcanic series 29 29 |  | | Book | | Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...excellent loose ilmenite crystal clusters from a calcite vein-dike digging site which they called the Bentley...ilmenite specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed...mine before 1964). The mineral assemblage of the vein-dike consists of ilmenite. magnetite, anatase, biotite...1stals were found in 2002 in a calcite-carbonatite vein intruding gneiss, together with very large Baveno-law-twinned |  | | Journal (issue) | | Field Trips Victor Gold Mine Tour, Cripple Creek District, June 9 Leader: Steven Veatch Contact: steve.veatch@gmail...surfaces, the result is polysynthetic twinning. Albite and calcite, shown in Figure 4, are examples. If...example. . Fig. 4. Polysynthetic twinning in albite and calcite. (Klein and Hurlbut, 1999) Fig. 5...look at examples of the following minerals: Albite Aragonite Calcite Chrysoberyl Fluorite...blessed with a wealth of Amethyst Vein ore. When it comes to collecting Amethyst Vein and lapidary material |  | | Book | | and the Central Mining District, Grant County Burro Mountains Apache No, 2 District Lake Valley Caballo...Mountains Chloride District Hansonburg District Socorro Area New Placers District Grants Area Nacimiento...Uplift Harding Pegmatite Ojo Caliente Pegmatite District 4. COLORADO MINES nm — On 29 DEPOSITS MEXICO...Luis Valley and the San Juan Mountains Bonanza District 33 33 36 37 46 54 bP) 57 59 60 64 68 74 78 80...Sneffels-Telluride District Red Mountain District Cement Creek Tungsten Area Ouray (Uncompahgre) District Poughkeepsie |  | 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 |  | | Journal (issue) | | Localities: The Erupción/Ahumada Mine, Los Lamentos District, Chihuahua, Mexico .............................WULFENITE from the Ahumada mine, Los Lamentos District, Chihuahua, Mexico; 6.6 cm across. Norm & Roz...extremely rich vein which may well continue to produce for some years. Since 1970 the amethyst deposits in...he invested his own money in the Los Lamentos district and helped manage the operations there until his...Localities: The Erupcio;n/Ahumada Mine Los Lamentos District Chihuahua, Mexico Wendell E. Wilson The Mineralogical |  | | Journal (article/letter/editorial) | | isotopeanalyseswere obtainedfor 50 whole-rocksamples,26 vein quartz samples,4 calcites,and 1 adulariafrom the...suggestsmaller water/rock ratios at Comstockand lower temperaturesof alteration at Goldfield. It is concludedthat...giving a letter indicatingthe particularmine from district, from the 900 to 1,300 levels of the Belmont,...Isotope Analysesof Samplesfrom the Tonopah Mining District (seeFigure 2 for exact locations) Sample Material...Q -1.8 Q +0.7 5235 -(from a pillarintheBelmont Vein 1000 B-k 1000 1100 A 1100 B-a B 1100 B-bt 5135 |  | | Journal (article/letter/editorial) | | September/October: Silver crystals, Bachelor mine, Amethyst vein system, Mineral County, Colorado; Dave Bunk...480-Million-Year-Old Host Rock, T. Moxon, 66–72 Albite, Quebec, 498 Allanite–(Ce), New York, 162 Almandine...Almandine, British Columbia, 32; Nunavut, 31 Amethyst, British Columbia, 39; Nova Scotia, 39; Ontario, 38;...Nevada, 515 Annabergite, Kilometer 3 Mine, Laurium District, Greece, R. B. Cook, 154–59 Apatite, nomenclature...Choice, Annabergite, Kilometer 3 Mine, Laurium District, Greece, R. B. Cook, 154–59; Calaverite, Cripple |  | 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...(chalcedony, quartz, and amethyst) are much larger and the values generally somewhat lower (21.2–31.5‰) in the... 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 |  | | Report (volume) | | gold"--commonly either muscovite or pyrite. As soon as vein gold was found in place in 1859 in the Gregory diggings...galena that had been recently found in the Tenmile district, Summit County. In his booklet, which today would...Indications of the principal metals produced by each district will give the knowledgeable collector some hints...hints as to the principal ore minerals in each district. I have made no attempt to list directions to the...LOCALITIES BOULDER COUNTY Locality 1.-Gold Hill district, Copper King mine. Bravoite, cobaltite, garnierite |  | | Journal (issue) | | China ABSTRACT: The turquoise deposit in Yunyang district, Hubei Province, China, is characterized by its...turquoise and its irregular occurrence in this district have attracted little attention from the Government...investigation into the turquoise mineralogy in this district and on the basis of this it was evident that more...The ore-bearing bed has been identified as the Lower Cambrian Shuigoukou Formation (e^g), (E jsg), part...quality of this district are all controlled by the (10-15%), sericite (3-5%), and albite (<1%). «1%). lithology |  | | Report (edition) | | (Mitchell, 1987). The "cleavelandite" variety of albite feldspar, which was named after him, can be found...Silurian rocks of the Merrimack trough Silurian to Lower Devonian rocks of the coastal volcanic belt 04-...crystal pockets include quartz (colorless, smoky, amethyst, or rose), colored tourmaliee, beryl (golden and...with cavities containing spectacular deep-purple amethyst crystals on a matrix of white quartz crystals...especially when looking for pieces of tourmaline or amethyst. Other important accessories include a magnifying |  | | 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) | | Heulandite Stilbite Chabazite Laumontite Wairakite Albite Sphene Epidote Actinolite Calcite Hematite Pyrite...periclase(Mg), metals (Fe, Ti, and Mn), calcite (Ca), albite (Na), and potassium chromate crystals (K) (Mori...absenceof corrensiteand laumontite. The rocks from the lower part of the Yotsuzawa formation and the upper part...sandstonesin the upper part of core no. 16 (near the lower end of subzoneIIIa) contains l5olosmectite (Fig...biotite in rocks with scarceepidote and abundant albite. DrscussroN As describedabove, saponite and chlorite |  | | Report (volume) | | SILVER: Notes on the gold lodes of the Carrville district, Trinity County, Cal., by D. F. MacDpnald.......account of the ore deposits of the Loon Creek district, Idaho, byJ. B.Umpleby................................................. Notes on the Antelope district, Nev., by F. C. Schrader................... Notes............ COPPER: The Turquoise copper-mining district, Ariz., by F. L. Ransome........... Survey publications... III. Geologic reconnaissance map of Antelope district, Nev............. IV. Geologic map of southwest-central |  | | Journal (article/letter/editorial) | | phase above 130·C, and analcime transformed to albite above 175·-200·C. It appears that cristobalite...in USW G-2 but must have reacted at considerably lower temperatures (and for longer times) in USW GU-3/G-3...deeper in the section, and Na for analcime and albite. Using the rocks in USW G-I, G-2, and GU/G-3 as...Energy. The proposed repository host rock is in the lower portion of the densely welded, devitrified Topopah...zones (glass, clinoptilolitemordenite, analcime, albite), and there is an apparent northward increase in |  | | 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...Sigmund, of Mina, Nev., reports the discovery of a vein of chalcedony, semiopal, and common opal, about...translucent gray chalcedony and milky-white opal. The vein of chalcedony is so.id to be from 2 to 6 inches |  | | Book (volume) | | Department of Conservation; and on the Four Peaks amethyst deposit in Arizona by Dr. F. W. Galbraith of the...Hiddenite crystals Hiddenite crystal Map of Pala District Clays and crystals in pocket Vanderberg Mine Pile...mass Ramona mines Rock crystal and amethyst Cut and rough amethyst Asteriated rose quartz sphere Rough...finished gem; this is particularly a problem in amethyst which 1s almost always color-zoned. Crystals may...wall-lining which a cavity contains, for example, amethyst frequently grows in solid sheets of crystals with |  | | Book (edition) | | ............................................. Amethyst ................................................of Brookneal, Va., for information concerning amethyst; J.E. Turner, of Hiddenit.e, N. C.; Lovat Fraser...information conreming petrified wood. AMETHYST. DIS.TRIBUTION. Amethyst is widely distributed over the Piedmont...Fine gem amethyst has already been obtained from some of the 1ocalities. Warren County.-Amethyst occurs...Creek and accordingly in more broken countrv. Amethyst has been found at two places on~the Alston plantation |  | | Journal (article/letter/editorial) | | transparency and include rock crystal (colorless), amethyst (violet to purple), smoky (light to dark brown)...quartz-tridymite inversion tempera ture of 870°C. At much lower temperatures, chalcedony and agate com monly form...silicate liquid coexists with water-rich vapor) to the lower temperatures of aqueous hydrothermal fluids that...granitic pegmatites such as those of the South Platte district in Jefferson County, the quartz, feld spar, and...quartz (smoky), microcline (tan to blue-green), albite, and fluorite, topaz, goethite, etc. in the pockets |  | Altaner, Stephen P, Ylagan, Robert F, Savin, Samuel M, Aronson, James L, Belkin, Harvey E, Pozzuoli, Antonio (2003) Geothermometry, geochronology, and mass transfer associated with hydrothermal alteration of a rhyolitic hyaloclastite from Ponza Island, Italy. Geochimica et Cosmochimica Acta, 67 (2) 275-288 doi:10.1016/s0016-7037(02)01077-3 | Journal (article/letter/editorial) | | I, pure illite, quartz, akspar, and occasional albite. The sericitic zone consists primarily of I-S with...Clay Mordenite Opal-CT Opal-C Quartz Akspar Albite 0 0 0 0 0 15 32 52 59 73 78 90 100 96 100 95 95...I-S with ⱖ90% I, quartz, akspar, and occasional albite. In this zone, the matrix and clasts are completely...exhibits significant gains in samples with authigenic albite. In the silicic and sericitic zones, nearly complete...quartz samples from the silicic zone. (a) Quartz vein (94-6-3R) from southwest part of silicic zone and |
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