 | | Journal (article/letter/editorial) | | i e r. c o m / l o c a t e / o r e g e o r ev Emerald deposits and occurrences: A review L.A. Groat a...Available online 22 April 2008 Keywords: Emerald deposits Emerald occurrences Crystal chemistry Geochemistry...isotopes Classification Exploration A B S T R A C T Emerald, the green gem variety of beryl, is the third most...year) of the world's emeralds. However there is speculation that the emerald mines in Colombia are becoming...accounts for approximately 10% of world emerald production. Emeralds have also been mined in Afghanistan |  | Xue, G., Marshall, D., Zhang, S., Ullrich, T. D., Bishop, T., Groat, L. A., Thorkelson, D. J., Giuliani, G., Fallick, A. E. (2010) Conditions for Early Cretaceous Emerald Formation at Dyakou, China: Fluid Inclusion, Ar-Ar, and Stable Isotope Studies. Economic Geology, 105 (2) 339-349 doi:10.2113/gsecongeo.105.2.339 | Journal (article/letter/editorial) | | pp. 339–349 Conditions for Early Cretaceous Emerald Formation at Dyakou, China: Fluid Inclusion, Ar-Ar...Glasgow, G75 OQF, Scotland Abstract The Dyakou emerald occurrence is located in Malipo County in the province...extends across the border between China and Vietnam. Emerald mineralization is hosted by pegmatite and associated...and oxygen isotope results from the emerald channel waters and emerald, respectively, are consistent with...igneous fluid source. The δ18O fractionation between emerald and quartz yields vein temperatures of 365° to |  | Brand, A. A., Groat, L. A., Linnen, R. L., Garland, M. I., Breaks, F. W., Giuliani, G. (2009) Emerald Lake Mineralization Associated with the Mavis Lake Pegmatite Group, near Dryden, Ontario. The Canadian Mineralogist, 47 (2) 315-336 doi:10.3749/canmin.47.2.315 | Journal (article/letter/editorial) | | 315-336 (2009) DOI : 10.3749/canmin.47.2.315 EMERALD MINERALIZATION ASSOCIATED WITH THE MAVIS LAKE PEGMATITE...Frederick W. BREAKS Ontario Geological Survey, Mines and Mineral Research Centre, Sudbury, Ontario P3E...Abstract The Taylor 2 (also known as Ghost Lake) emerald showing near Dryden, in northwestern Ontario, is...altered ultramafic sill. Most of the beryl and emerald occurs in a “zone of mixing” between the southern...to pale green in color, but about 10% are emerald. The emerald compositions show average Cr concentrations |  | | Book | | INDIA 42 - - DIGGING NEAR DIAMANTINA, BRAZIL MINES OF KIMBERLY, 1872 MINING, Rio JEQUETINHONHA, BRAZIL... - 30 OBSIDIAN CLIFF, YELLOWSTONE PARK OPAL MINES, NEW SOUTH WALES - 181 - PATH OF RAY IN DIAMOND...Frontispiece r Garnet, Amethyst, Bloodstone, Diamond, Emerald, Agate, Ruby, Sardonyx, Sapphire, Opal, Topaz,...Aquamarine, Connecticut; Aquamarine, Ural Mountains; Emerald in matrix, Ural Mountains. TOURMALINE Green Tourmaline...Tourmaline, Haddam, Connecticut; Tourma- Red Tourmaline, Island of Elba; Red Tourmaline, Brown Tourmaline, Gouverneur |  | | Book | | SPINEL DIAMOND STAR SAPPHIRE SAPPHIRE ESSONITE EMERALD RUBELLITE AQUAMARINE TOURMALINE 0£,iner •lilBD...California. Schettler Gift Morgan Gift Gift EMERALD Combination Pale "balas ruby," step 9% carats...carats. near Los Cerrillos, 96 carats. Zebirget, Egypt. Morgan heart shaped cabochon, step-cut stone... i earth is made are used We make call granite to build us in various ways. use of the mixture...possess is beauty of color. From the rich brilliant red of the ruby through the delicate and subtle shades |  | | Journal (article/letter/editorial) | | Gregory Hill, Tallapoosa Co., Ga. ARIZONA—Is our face red! It is and should be because in the July - Aug. 1955...the Lucky Jack dump. The Lucky Jack and the nearby Red Cloud are located high above timberline with no timbered...enthusiastic as he describes the minerals in the various mines. If ever I am in Silverton again, with time on my...gneiss which has been thoroughly injected by pegmatitic granite. The sample was picked up by one of the scientists...Co.), Iowa. These joints are filled with a dark red-brown clay. By all appearances, most of the aragonite |  | | Journal (article/letter/editorial) | | alkaline magmatic clan and carbonatites with pegmatitic plus aplitic derivative products 53.1.5. One-dimensional...everybody's satisfaction, so that a vast part of the sea has still to be considered as an area of scientific...heliodor, goshenite, morganite, rosterite, bixbite, emerald Berzelianite Bicchulite Bikitaite (continued on...granitic intrusion itself are treated as part of a granite-related mineralization rather than a vein mineralization...mineralization of its own. They never occur far off the granite with which they are genetically associated. Fault-related | | | Journal (article/letter/editorial) | | alkaline magmatic clan and carbonatites with pegmatitic plus aplitic derivative products 53.1.5. One-dimensional...everybody's satisfaction, so that a vast part of the sea has still to be considered as an area of scientific...heliodor, goshenite, morganite, rosterite, bixbite, emerald Berzelianite Bicchulite Bikitaite (continued on...granitic intrusion itself are treated as part of a granite-related mineralization rather than a vein mineralization...mineralization of its own. They never occur far off the granite with which they are genetically associated. Fault-related |  | | Book | | Tungyen Prefecture, Kweichow, China Frontispiece Emerald tains. Tokowaja River, Ural MounPink Beryl, Crystal...employees Diamond Mines: Open gambling in the 28 compound, Kim- berley Mines 30 On the floors...Beers Diamond Mines, Kimberley, South Africa Railway One 32 ... 34 Kimberley Mines 36 to Kimberley...The tunnel along one-thousand-foot Beers Diamond Mines Cullinan Diamond — in the rough; actual De 38...Pyrope. Sapphires. Diamond crystals from Kimberley Mines National United States Specimens in Topaz. |  | | Report (issue) | | •Jodhpur Mirpur eKhas •Hyderabad Jiwani Arabian Sea Kota . • 0 � C'I Ratlam National Capital International...Dudley Blauwet & Shafiee Muhammad .........Page 48 Red, Green & Blue Gemstones from Honza Vera M.F. Hammer...with the Ministry of Mines, Customs and Industry were so fraught with bureaucratic red tape that I abandoned...ucing considerable quantities of lapis lazuli and emerald. These species, along with associated minerals...existence mining the material from the weathered granite and alluvium. At present Pakistan is in a period |  | | Book | | F. HUME, the Pioneers of the E astern Desert of Egypt 1\1:ultum non multa Plinius ]1-1,nior CONTENTS...OF SUEZ AND THE NORTHERN RED SEA . . . . . 7 . r. Tectonic map of Egypt by N. A. Syagaev . . . ...Southern Area of the Red Sea Hills towards the Sudan border (Photogeological map of Upper Egypt by Hunting, 1967)...1967) 4. Border area between Sudan and Egypt 5. A. Stratigraphic correction . . . . . . B. Tectonics... . . . . a) Fault Zones crossing the Northern Red Sea. b) The Cairo Graben . . . . . . c) The northern |  | | Journal (issue) | | from the Quarry Connoisseur's Choice: Topaz from Granite Pegmatites, Limoeiro Mine, Virgem da Lapa, Ara~uaf...great event but for one exception, that of a huge red tourmaline crystal rising out of a bed of snow-white...those found intimately associated with cooling granite magma that, with luck, are also cavity-bearing...and bicolored tourmalines (elbaite) from serval mines in San Diego County, California; huge gem topaz...cranberry-red giant elbaites from Minas Gerais, Brazil; beryl variety heliodor from Ukraine; red elbaite |  | | Report (volume) | | ..................................... Graphic granite.............................................. Feldspar...plagioclases................................. Graphic granite..................;........................................................................ 145 Emerald..................................................V. A, Lenses of quartz diorite in porphyritic granite, St. George River; B, Flow gneiss, same locality............ 22 VIII. Photomicrograph of graphic granite from Topsham................. 24 I.. A, Muscovite-rich |  | | Book (edition) | | for most mineral production. The majority of the mines still officially discourage collecting by workers...of beauty for their few cents' worth of metal. Mines that encounter specimens of great artistic and scientific...Mining and Mineral Museum, the Arizona Bureau of Mines, the Arizona Sonora Desert Museum, the Canadian...Igneous Rocks Igneous Rocks: Obsidian Igneous Rocks: Granite 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Sedimentary...studies of inaccessible and abandoned mines. Someday many old mines may come again to life, reopened because |  | | Book | | own tumbling and grinding machineto cutting an emerald !The extensive reference section describes over...nucleus consists of positively charged protons (red) and uncharged neutrons (white). Round it circle...as corals, extract dissolved carbonate ions from sea water and incorporate them into their skeletons or...in the ever-thickening layers of sediment on the sea floor and become the rocks we know as limestones...water in landlocked lakes or at the margins of the sea in hot desert areas, such as the Persian Gulf. The | | | Book | | own tumbling and grinding machine to cutting an emerald! The extensive reference section describes over...positively charged For our present chemistry. protons (red) and uncharged purposes we can stick to what is...corals, extract dissolved carbonate ions from sea water and incorporate them into their skeletons or...in the ever-thickening layers of sediment on the sea floor and become the rocks we know as limestones...in landlocked lakes or at the margins of the sea in hot desert areas, such as the Persian Gulf. The |  | | Journal (article/letter/editorial) | | Scandian Ixiolite, Pyrochlore and Bazzite in Granite Pegmatite in Tordal, Telemark, Norway. A Contribution...accepted February 15, 1988 Summary In Tordal granite pegmatite veins cut through a volcano-sedimentary...overlies an older, gneissic basement and younger granite from which they originate. Positive co-variations...of scandium and tin during the passage of the pegmatitic material through the volcanic sedimentary sequence...of a large-scale pegmatitic system which emanates from the Precambrian Tordal granite (960-850 My). The |  | | Book (volume) | | round brilliant red-orange spessartine garnet (16.62 ct), Ramona, California; deep red cushion cut rhodochrosite...45 cm (18 in.) long. BOTTOM GROUP. Deep, spinel red oligoclase feldspar (5.04 ct), Oregon; and three...much improved clarity and color. Beautiful, intense red beryl crystals, many of facet-grade, found in the...treated to release the crystals. Red beryl gems, resembling the finest red spinels in color, are being established...fetch prices comparable to similar size-range emeralds. The United States continues to supply the major |  | | Book | | described in this book are rubies, sapphires and emeralds. Not even the diamond crystals from Lahtojoki... . . . . . . . . . . . . . 8 Green amazonite granite in Muurame . . . . . . . . . 194 Finnish gemstones.... . 296 Smoky quartz of the Laitila rapakivi granite . . . . 100 Chalcedony in Vuotso . . . . . ... . . . . . . . . . . . . . . . . 307 Graphic granite . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . 311 Gemstones of the limestone mines . . . . . . . . . . . . 119 Serpentinite . . . |  | | Report (issue) | | United States or for any of the States in which mines were examined, but describes only those deposits...many persons during the examination of different mines and is here acknowledged. Aid was given in New Hampshire...who. furnished general information on a number of mines in Grafton County and extended other kindnesses;...to mica from any one State which has a number of mines in intermittent operation. Accordingly accurate...is therefore allied to granite in composition and has been called giant granite. Its texture grades from |  | | Journal (issue) | | in g C o u n t y Martin Jensen Mackay School of Mines University of Nevada, Reno Reno, Nevada 89557-0047...species have been donated to the Mackay School of Mines museum. I also maintain a fine and complete collection...comment. Today, with the widespread closure of mines, both abandoned and active, and the passing of many...more than a century old in the Mackay School of Mines Museum collections. It is present on exposed surfaces...Record, volume 24, May-June, 1993 Figure 11. (left) Red to black cuprite crystals, two generations, from | | | Book (volume) | | round brilliant red-orange spessartine garnet ( 16.62 et), Ramona, California; deep red cushion cut rho...45 cm (18 in.) long. BOTTOM GROUP. Deep, spine! red oligoclase feldspar (5.04 et), Oregon; and three...much improved clarity and color. Beautiful, intense red beryl c1ystals, many of facet-grade, found in the...treated to release the crystals. Red beryl gems, rese1nbling the finest red spinels in color, are being established...fetch prices comparable to similar size-range emeralds. The United States continues to supply the 1najor |  | | Book (volume) | | ............ 183 Reports from the Acton Silver Mines and Other Districts ..............................transformed by his first visit to the tourmaline-bearing granite pegmatite at Mount Mica in 1952 and Gene eventually...internationally recognized as an authority on granite pegmatites, mineralogy, and geology. Gene authored...new ocean basin, such as is forming today in the Red Sea region of the Middle East. Continental margins...Rebound ofland surface to current level. Gradual sea level rise, continuing to present. Ongoing low-level |  | | Book (edition) | | Africa, Australia, and Antarctica), then those of pegmatitic origin in the same sequence: North and South... hollandite. and shattuckite, etc., in brownish red, metamorphic Mn-rich 113°45'. 79°34·, Z = 1. d: 10...Apikia. Andros Is., both Greece. NJbMA 163, mm. Pink. red-brown. luster submetallic to adamantine, soft. Cleavage...tin ingots from a ship wrecked 100 years ago in Red Sea, Saudi Arabia. AM 78, 235-236, 1993. Abswurmbachite...1.564(6) - Fraser R., all British Columbia, in Granite Mts., Wy1.084(7) - 1.052(9). Long-bladed, sometimes |  | | Book (edition) | | recognized by name according to their color, thus the red is ruby, blue is sapphire and the yellow and green...sometimes erroneously called topaz and emerald. (The true topaz and emerald are really silicates of aluminum...to 800 tons of cleaned corundum. Several other mines in the immediate vicinity and in the same formation...Rabun County, is one of the best known corundum mines in the United States and was successfully operated...a and oJwrntious are given in the Department of Mines reporui. 2 Union of South Africa:.-··Except for |
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