 | | Book | | 200 known here-holds the productive Mwadui diamond mine, known for Yeryfine, rare, pink diamonds. Emerald...Garnets of East Africa 73 Rh.odolite of the Lindi District, Tanzania 76 Tsavorite Garnets 76 The Pyrope-...Tanzania 96 Red Dravite Tourmaline from the Narok District, Kenya 99 Uvite-Dravite Chrome Tourmaline 99 ...Williamson Mine and operations. 21 Figure 2.5. A 2. 9-carat pink diamond from the Williamson Mine. 25 Figure...Tsavorite crystal. 77 Figure 3.12. Umba, Tanzania, corundum mine. 42 Figure 6.3. Campbell Bridges. 78 Figure |  | | Journal (article/letter/editorial) | | combining the commodity (lines) shown by numbers plus lower caps with the host rocks or structure (columns)...minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...spinel minerals . . . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond | | | Journal (article/letter/editorial) | | combining the commodity (lines) shown by numbers plus lower caps with the host rocks or structure (columns)...minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...spinel minerals . . . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond |  | | | | surrounded ce ne white calcite, from!iheBluebell Mine; Riondel, Digitized by the Internet Archive...element. Gold, copper, silver, platinum, bismuth and graphite fall in this subdivision. Sulphides and arsenides:...carbonate, borate, and phosphate groups are included. Corundum, spinel, cuprite, rutile, cassiterite, calcite...description is not clear, e.g., submetallic, for graphite. Adamantine: brilliant, hard, durable, e.g., diamond...fluorite, 5 apatite, 6 feldspar, 7 quartz, 8 topaz, 9 corundum, 10 diamond. For field identification it is sufficient |  | | Book | | times, and there is evidence of at least one flint mine dating from this period. Finely worked and polished...derives its name from the saltmining district of Hallstatt in Upper Austria, where many prehistoric finds have...below. South Africa. Below right Coarsely foliated graphite. Rap;edara, Cevlon. PLATE 1 C '9 1 Orthorhombic...of these fourfold axes in all. The considerably lower symmetry of a monoclinic crystal is shown in Fig...crystallographic symmetry of a body may often be lower than its apparent geometric symmetry. In a pyrite |  | | Book | | utilization of known materials (e.g., chemically pure graphite applied as a moderator of fast neutrons in atomic...partial ablation of the surface causes cooling of the lower layers, which thus acquire a more resistant structure...(diorites to quartz diorites) which predominate in the lower layer of the continental crust, produces melts that...industrial minerals of magmatic origin (diamond, graphite, corundum, forsterite, apatite, eruptive rocks) form...consolidation. The early magmatic deposits of diamonds and graphite have a common origin from carbon or carbonaceous |  | Garnier, Virginie, Giuliani, Gaston, Maluski, Henri, Ohnenstetter, Daniel, Phan Trong, Trinh, Hoàng Quang, Vinh, Pham Van, Long, Vu Van, Tich, Schwarz, Dietmar (2002) Ar–Ar ages in phlogopites from marble-hosted ruby deposits in northern Vietnam: evidence for Cenozoic ruby formation. Chemical Geology, 188 (1) 33-49 doi:10.1016/s0009-2541(02)00063-3 | Journal (article/letter/editorial) | | 1. Introduction Ruby is the reddish variety of corundum which results from the substitution of chromium...Bai Province (Fig. 1), (2) the Quy Chau mining district, in the Vinh Province located in the large metamorphic...associated with ruby. The age data for each ruby district are compared and discussed in the light of previous...the Yen Bai and Luc Yen mining districts (1) The corundum deposits of Yen Bai occur within the high-grade...ruby and sapphire deposits of the Quy Chau mining district (map modified after Phan, 1991; Geological Survey |  | | Journal (article/letter/editorial) | | Co., where turquoise is found as thin veins in graphite schists (Carboniferous). The Erin occurrence is...of black, crystallized ferberite from the Conger Mine, near Nederland, Boulder Co., Colo. It is good to...Can anyone supply information on the occurrence? District oí Columbia—On a recent visit to Washington, the...Hampden Co., Mass. The best specimens occur at the Old Mine. Michigan—A nice dark grayish cephalopod from the...are often of enormous size, coiled like a ram's horn, and of excellent quality. Missouri—T. A. Patterson |  | Ngoc Khoi, Nguyen, Hauzenberger, Christoph A., Anh Tuan, Duong, Häger, Tobias, Van Nam, Nguyen, Thuy Duong, Nguyen (2016) Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic range, Ailao Shan–Red River shear zone (North Vietnam) Neues Jahrbuch für Mineralogie - Abhandlungen Journal of Mineralogy and Geochemistry, 193 (2) 161-181 doi:10.1127/njma/2016/0300 | Journal (article/letter/editorial) | | Article Mineralogy and petrology of gneiss hosted corundum deposits from the Day Nui Con Voi metamorphic...Duong With 10 figures and 6 tables Abstract: Corundum deposits and occurrences are typically associated... Relatively little attention has been paid to corundum hosted by partly migmatized gneisses and pegmatoids...occur in feldspathic pegmatoid rocks (type II). Corundum crystals from both types are short prismatic with...with star effect can be observed as well. Type I corundum is noted for high content of total Fe (5500 to |  | | Journal (issue) | | described. As yet the region has not yielded a corundum crystal large enough to be included in the list...Ch'unch'on). Annual production of the nephrite mine (the Daeil Mine) is reported to be approximately 80 000-90...map of nephrite mine area, Chuncheon, Korea. Occurrences The geology of the nephrite mine area consists...1995,24, 8 549 Fig. 3. Mine workers remove nephrite ore at the Daeil Mine, Chuncheon, Korea. The nephrite...Acknowledgements I thank the Daeil Mine for allowing access to the mine. Thanks are also due to S.E. Lee |  | | Book | | A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...sapphires and rubies are actually the same mineral, corundum. The difference between the two is at the atomic...Fluorapatite Topaz Hardness 6 Hardness 9 Microcline Corundum encke Madagascar e(2x23x3em Quartz, Mount Ida...Ida, Arkansas, USA ° 14x 15 x 10 cm Corundum, Mozambique * 17 x 11 x 10 cm Hardness 7 Hardness 10 ...see it as being very dark or black (for example, graphite). Alternatively, if very little of the color in |  | | Book | | latter is better known in two forms as diamond and graphite. The basic element of the commonest mineral —...occur are called modifications, e.g. diamond — graphite, calcite — aragonite, pyrite — marcasite, quartz...scalenohedron The HexagonalHI ery] pyrrhotite i corundum System octahedron > & zincite apatite trisoctahedron...results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned in such a way that they form...gypsum 7. quartz 3. calcite 8. topaz 4. fluorite 9. corundum 5. apatite 10. diamond These hardness tests can |  | | Catalog/List | | mineral, "At were of large, prisms, of this mine have been obtained, more Note. - Galena offer...in the specimens Dundasite, bunches samples Mine, of occurs lode. beautiful white large more...originally Cornish mining ceeding by colour, Mine fractures of great the mineral often Mount ...extremely some rarely Anglesite. Embolite, back Mine. with minute of small of capping gossan the...with diamonds because this hundred found corundum July 8, 1892, ments with in this surface |  | | Journal (issue) | | and a History of Emerald Mining in Habachtal, Austria Duncan Pay FEATURE ARTICLES p. 300 292 Blue...of Emerald Mining in the Habachtal Deposit of Austria, Part I p. 347 Karl Schmetzer Contributes to...Gem News International Biogenic carbon in pink corundum from Greenland • Yogo sapphire update • Banded...sales of pink and blue diamonds from the Argyle mine • Chalcedony-epoxy composite imitation of “candy...and a History of Emerald Mining in Habachtal, Austria Welcome to the Winter 2021 issue of Gems & Gemology |  | | Journal (article/letter/editorial) | | Belt contains numerous primary deposits of gem-corundum Ži.e., ruby and sapphire.. The ruby deposits in...their margins. Field relationships reveal that the corundum-bearing rocks are genetically related to the ultrabasic...primary deposits of rubies Žand of subgem red corundum. formed only under granulite facies conditions...subsequently tectonically inserted into country rocks of lower metamorphic grade. This apparently occurred without...concerning the geological contexts of primary gem-corundum deposits Ži.e., ruby and sapphire. still remains |  | | Book | | & scoria 52 Pyrophyllite 205 217 220 62 Corundum &emery Rare-earth minerals 90 Salt Diamonds...related materials Feldspar 106 Fluorspar Garnet Graphite 110 Slate Sodium sulfate 122 = 130 Iodine...abrasives, for example, have largely replaced corundum and its cohorts. A major movement in the opposite...and graphite. Certain then discuss the major producing districts, or a representative district if there...that their graphite supply must come not merely from one district but from a single mine. Thus the physical |  | | Journal (issue) | | Heierman collection. Illinois- Kentucky Fluorspar District Symposium by the Friends of Mineralogy (Midwest...the closing of the Illinois-Kentucky fluorspar district that I organized at Indiana University Southeast...believed having a similar program in the fluorspar district would be ideal. However, the logistics behind...this year. In previous visits to the fluorspar district, I had made contact with Bill Frazer, the owner...l\larble-host Ruby Deposits Ruby is a gem variety of corundum. colored red by traces of chromium oxide (CrJO |  | | Journal (article/letter/editorial) | | metamorphic Saualpe crystalline basement (Eastern Alps, Austria) G. HA BLER AN D M. TH OÈ N I Institut fuÈr Geologie...Vienna, Geozentrum, Althanstraûe 14, A-1090 Vienna, Austria (e-mail: Gerlinde.Habler@univie.ac.at) ABSTRACT...gneiss, yielded 600 uC/0.4 GPa. Results from a corundum-bearing lithology suggest that higher temperatures...equivalent to the Plattengneiss of the Koralpe 2 Corundum-bearing, graphitic biotite plagioclase gneiss...Conditions were the same as given above except for a lower beam current of 20 nA. The MINSORT software (Petrakakis |  | | Report (Issue volume) | | Association (Sweden, Norway, Finland, Iceland, Austria, and Switzerland); Malta; the 8 Centrally Planned...Bauxite duction Priтагу metal Copper Mine Refined Lead Mine Refined Market Economy Countries: European...European Free Trade Association (EFTA) 4,292 2,861 Austria Finland Iceland Norway Sweden 12,901 Switzerland...specified) Mineral fuels Industrial minerals Zinc Mine Refined Nitrogen (N content Cement of ammonia)...68 73 European Free Trade Association (EFTA) Austria Finland Iceland Norway Sweden Switzerland Subtotal |  | Ertl, Andreas, Rakovan, John, Hughes, John M., Bernhardt, Heinz-Jürgen, Rossman, George R. (2019) Vanadium-rich Muscovite from Austria: Crystal Structure, Chemical Analysis, and Spectroscopic Investigations. The Canadian Mineralogist, 57 (3) 383-389 doi:10.3749/canmin.1900020 | Journal (article/letter/editorial) | | 3749/canmin.1900020 VANADIUM-RICH MUSCOVITE FROM AUSTRIA: CRYSTAL STRUCTURE, CHEMICAL ANALYSIS, AND SPECTROSCOPIC...Universität Wien, Althanstraße 14, A-1090 Vienna, Austria JOHN RAKOVAN Department of Geology and Environmental...veins in graphite schist from Weinberg mountain, near the village of Amstall, Lower Austria, is distinctly...muscovite-2M1, crystal structure, graphite schist, Amstall, Austria. INTRODUCTION Vanadium-bearing muscovite-2M1...from a quartz-graphite § schist (Mariposa County, California, USA). In the Janggun mine area, Republic |  | | Book (edition) | | scale to soapstone at the other. There is a still lower limit in liquids and gases; but of the hardness...the planes of the trisoctahedron in Fig. 21. The lower one of the three on the upper front solid angle...by a constant ratio, and the expression for the lower right one of the six planes will be 3c f & la. By...being here directly over those suppressed in the lower pyramid. APATITE. If the student will shade over...of the upper pyramid alternate with those of the lower; but -this kind occurs only in the rhombohedral | | | Book | | latter is better known in two forms as diamond and graphite. The basic element of the commonest mineral quartz...occur are called modifications, e.g. diamond — graphite, calcite — aragonite, pyrite — marcasite, quartz...rhombohedron scalenohedron calcite wulfenite corundum 1 m a es X — O U> = j? -a nepheline beryl...results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned jn such a way that they form...gypsum 7. quartz 8. topaz 3. calcite 4. fluorite 9. corundum 10. diamond 5. apatite These hardness tests can | | | | | intermediate layer of rock, and a thin cool crust. LOWER MANTLE ASTHENOSPHERE LITHOSPHERE CORE OUTER CORE...magnesium. It is composed of three zones: the immense lower mantle; the warmer, gooey asthenosphere in the middle;...instance—but geologists also have heavy, and ride lower in the mantle. The continental plates are thicker...endorsed Hutton’s view chronological order, with the lower that geological events in the past strata being... The pressure of sediment from above turns the lower sediments into rock. Where index fossils are not |  | Sorokina, Elena S., Rösel, Delia, Häger, Tobias, Mertz-Kraus, Regina, Saul, John M. (2017) LA-ICP-MS U–Pb dating of rutile inclusions within corundum (ruby and sapphire): new constraints on the formation of corundum deposits along the Mozambique belt. Mineralium Deposita, 52 (5) 641-649 doi:10.1007/s00126-017-0732-x | Journal (article/letter/editorial) | | inclusions within corundum (ruby and sapphire): new constraints on the formation of corundum deposits along...Abstract Direct dating of corundum and the establishment of age constraints for corundum crystal growth are...mineral inclusions may help define minimum ages for corundum growth. Here, we present results of in situ LA-ICP-MS...LA-ICP-MS U–Pb dating applied to rutile inclusions in corundum from localities along the Mozambique belt. U–Pb...Gitonga pit (John Saul ruby mine) and 526 ± 13 Ma for the Aqua Ruby mine, both in the Mangari area of |  | | Book | | always one that has been well opened, such as a mine, a quarry, road or railroad cut, or a cliff. Fresh...the upper part (the crown); 8 pavilion facets, 16 lower-girdle 21 Brilliant-cut diamond a brilliant-cut...cut; (c) too shallow facets, and 1 culet on the lower part (the pavilion). The propor¬ tions and number...but more expensive, diamond saw. Pavilion. The lower part of a faceted gem, below the girdle. 26 On... Two models of tumblers—the upper rotates, the lower vibrates. Polished gem stones of irregular shapes |
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