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| occurrences of the mineral (e.g. in Australia, Malawi, Thailand, Cambodia, etc.), often producing too...material. The question arises why sapphire from this region is so highly regarded. The fantasy is, of course...orange corundum (ruby and and padparadscha) padparadscha) from Malawi Dr Dr H. F. H. Bank Dr U. U. Hennl...Southern Malawi was (1958). The The locality described is is situated on on the the Chimwadzulu Hill, approximately...1989, one of the authors has visited at the Chimwadzulu Hill (Figure 2) and the mine at Ā© Ā© Copyright |
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| Natural and heat-treated corundum from Chimwadzulu Hill, Malawi: genetic significance of zircon clusters...gem-quality rubies from the eluvial deposits of Chimwadzulu Hill, Malawi. Zircons and multiphase-diaspore-CO 2...inclusion assemblage may help to distinguish Chimwadzulu corundums from those from other areas, individually...intermittently from the eluvial soils of Chimwadzulu Hill, southern Malawi, since the 1960s. Previous, small-scale...3 Chimwadzulu ruby ~ 2 c o:l .0 0 Ā«'" .0 1 0 200 400 600 800 1.0 B 0.8 Chimwadzulu colourless |
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| Triplite from Pakistan ā¢ Gem localities in Zambia and Malawi ā¢ Barite āspearsā in fluorite ā¢ Inclusions in Arizona...carats) of peridot rough from the Sapat Valley region of Pakistan was purchased in early 2004. Following...valuable, especially the orangy pink variety (āpadparadschaā). Several studies of Be-diffused corundum have...synthetic orange sapphire. Also referred to as the āpadparadschaā variety of corundum. NOTES AND NEW TECHNIQUES...overlap any of the numerous Cr and V peaks in that region. corundum samples (NBeS-1 and NBeS-2). The dominant |
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| these gems. 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John...āD-TO-Zā DIAMONDS diamonds from the Cape of Good Hope region, and āJagerā for colorless diamonds with strong...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note...that results in an additional emission in the red region between 620 and 700 nm that does not have a noticeable |
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| main shareholders were Anglo-American Group, 45%; Central Holdings, the Oppenheimer family trust, 45%; and...nationās output for resale to cutting operations (Hill, 2008). The State Diamond Traderās office opened...of 2008, the market went into a severe decline (Hill, 2009). Alrosa. After it was requiredānot without...with the opening of a new mine in the Nova Era region and technological developments at established mines...acquisition of the āTsavorite Projectā from Green Hill Mining Ltd. and Figure 11. This 8.72 ct green zoisite |
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| nickel (depending on the color desired) into a region that extends just below the surface of the otherwise...permitted microprobe analysis of both the near-surface region affected by the diffusion treatment process, as...were taken i n a central colorless part (spectrum a), and i n the outer blue region (spectrum b), of...comm., 1990) that diffusion-treated rubies and 'padparadscha" sapphires have already been produced in Bangkok...highly civilized, complex societies flourished in Central America, including the Olmecs, the Mayans, and |
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| ........................................... 34 Malawi .................................................minister of mineral resources who said he believed the region needed new areas to prospect, as there have been...of machinery miners operating at present in the Central Queensland Fields, however, the number of hand...claims, and fuel prices are still on the rise. A central Queensland sapphire miner named Elias Christianos...Cynthia Renee. Photo: Robert Weldon. T he border region of northern Paraiba and southern Rio Grande do |
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| 271 Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and...Kashmir (in what is now the Indian part of the region) in 1881 after a landslide revealed the blue gems...remoteness of the deposit and military activity in the region. Myanmar. Burma (known as Myanmar since 1989) has...medium-to-dark tones that were mined from the Mogok region, in Burmaās Mandalay Division. These are sometimes...rare pinkish orange 242 RUBY AND SAPPHIRE āpadparadschaā (figure 9), and ruby, as well as star ruby |
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| cultured pearls from Japan ā¢ New ruby production from Malawi ā¢ Pink to pink-orange spinel from Tanzania ā¢ Large...is produced at low pressures, typically in the region of one-tenth of atmospheric pressure, from carbon-con-...grown on a substrate held at a temperature in the region of 800ā1000Ā°C. For many industrial applications...carried out at temperatures and pressures (in the region of GEMS & GEMOLOGY SPRING 2004 3 Figure 2...absorption could be detected in the one-phonon region of the infrared spectrum and the material was therefore |
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| Madagascar), South America (Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan...The major sources for diamonds were Australia, central and southern Africa (Botswana, South Africa, Namibia...the country rather than to the specific mine or region. For more on the specific localities, consult tables...mines have prompted active exploration in this region (Schwarz, 1999). Emerald mining also continued...the Lukusuzi game park area in Zambia (bordering Malawi and Mozambique) used creative methods to obtain |
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| pigeon's-blood rubies are pried from both soil and central government control. Marvel over India's maharajahs...O ther US corundum localities 473 Bibliography-Malawi 383 M exico 384 Bibliography-Mexico 384 N amibia...nited Kingdom_453 Bibliography-Madagascar 382 Malawi 4 18 4 10 RUBY & SAPPH I RE 18 498 ā¢ INTRODUCTION...and stars. As the sun rose, we descended the final hill into the Kathmandu valley. Paradise lost-paradise...only slightly above the stall speed of a bicycle. Central government policies had so decimated the 1nanufacturing |
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| watch the sunset over the horizon in a glow of Padparadscha colours, or will it be too hot to sit outside...Quartz Mystic Topaz Obsidian Onyx Opal Orthoclase Padparadscha Sapphire Paraiba Tourmaline Pearl 292 294 301...Lorique Louis de berquen Loupe Lustre Madagascar Malawi Malleable Marcel tolkowsky Marilyn monroe Marquise...laboratories have confirmed that the material from this region gets its incredible colours naturally from Mother...have found this fantastic gemstone). Mining in the region at the famous āShallow Nobbyās Mineā started in |
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| 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound |
| | Journal (article/letter/editorial) |
| 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound |
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| 121 Faceting Transparent Rhodonite from Broken Hill, New South Wales, Australia Paul W. Millsteed Presents...Gemological Institute of America (GIA, in Carlsbad), Central Gem Laboratory (CGL, in Tokyo), and Tiffany & Co...orangepink to pinkish orange sapphires (the so-called padparadscha colors), as well as yellow sapphires, became...LA-ICP-MS LIBS SIMS 2 2 2 2 3 10 Yellow Padparadscha Orange Blue Colorless Colorless Sri Lanka Sri...Terezinha overlapped to various degrees in the Zn-Li region. The alkali graniteārelated Kaduna emeralds of |
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| Vishnevye Mts. in the Urals, a famous pegmatite region about 100 km south of Ekaterinberg, were purchased...exploration potential that exists in the surrounding region. Historical background Archaeologically, nephrite...locality have been found scattered throughout central and Ā© Gemmological Association and Gem Testing...were promoted as the principle nephrite-producing region for the Soviet Bloc countries and this appears...structural high and the oldest tectonic element in the region. These Precambrian rocks are unconformably overlain |
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| (Solesbury, 1967; Zwaan, 1974; HƤnni, 1987) Vietnamācentral, at Quy Chau (Kane et al., 1991; Poirot, 1997)...Ochieng, 1991; Levitski and Sims, 1997) MalawiāChimwadzulu Hill (Rutland, 1969; Henn et al., 1990a) Sri...of ultramafic (low Si; high Mg, Fe) rock (e.g., Malawi: Rutland, 1969; again, see table 1). As stated...Within the triangle, the considerable overlap in the region between the Fe and V apexes is due mostly to the...Rupasinghe M.S. (1986) The Elahera gem field in central Sri Lanka. Gems & Gemology, Vol. 22, No. 2, pp |
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| and pressure conditions in a most clearly seen region may in rise greatly over a period of time....(vividness) of the hue increases moving outward from the central axis. Figure 2 shows that the range of chroma varies...Prussia (now U.S.S.R.): Succinite Entire Baltic Sea region, including Poland, East Germany, Norway, Denmark;...Arizona; New Mexico; Coeur d'Alene district, Idaho. Hill, = 1 Anglesite gems are colorless to pale brown...diagnostic. Luminescence: Occurrence: Gamba data. Hill, None. Pegmatites. Uganda; Acari, Brazil. Inclusions: |
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| brilliant alexandrites with chromium contents in the region of 0.4 wt% Cr2O3 (as determined for our HOC-grown...diffraction was used to detect the composition of the central parts of the new varieties. The results reveal...However, the powder sample collected from the central part of the cross-shaped pearl showing orange CL...there is a small amount of black mud powder in the central hole. However, its surface iridescence is very...vaterite, and some organic residue remaining in the central hole. 1. Patent number 200510026149.8, innovation |
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| metamorphism the temperature and pressure conditions in a region may rise greatly over a period of time. A given...Prussia: Succinite (now U.S.S.R.). Entire Baltic Sea region, including Poland, E. Germany, Norway, Denmark;...Dundas, England; Sardinia; Scotland; Broken Hill, Wales; N.S.W., Tasmania. Morocco: gem crystals...Birefringence: (Bi, Sb) (Ta, Nb)Os. Colors: Density: Hill, Cleavage: See also: Tantalite, Stibio- Crystallography:...Secondary mineral in Cu and Pb deposits. Chile; Broken Hill, N.S. W., Australia. Boleo, Baja California: magnificent |
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| Ltd., Lucerne, Switzerland; Hiroshi Kitawaki, Central Gem Laboratory, Tokyo, Japan; Michael S. Krzemnicki...mine/ Muzo green emerald, sunrise and sunset padparadscha sapphire, honey-colour chrysoberyl and ParaĆba-colour...approximately 18 km southeast of Mogok (Figure 3). The region is mainly underlain by the Mong Long mica schist...Mong Long area is located south-east of Mogok, in central Myanmar. Ayeyarwady (Irrawaddy) River Momeik...much of this pyrite is the Huanzala mine in west-central Peru, which has probably yielded thousands of tonnes |
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| is an imprint of Elsevier Linacre House, Jordan Hill, Oxford OX2 8DP, UK 30 Corporate Drive, Suite 400...an inner solid region of diameter 2440 km and density about 8 gcm3, and an outer region about 2260 km...alumina, alkalis and the rarer elements. If the region is quiescent and all the magma solidifies in the...if about half way through crystallization, the region becomes 8 Rocks and the Processes That Formed... More recently, it has been found that where a region is saturated with water, jadeite can form in veins |
| | Book (edition) |
| metamorphism the temperature and pressure conditions in a region may rise greatly over a period of time. A given...Prussia: Succinite (now U.S.S.R.). Entire Baltic Sea region, including Poland, E. Germany, Norway Denmark;...Scotland; T-J1a/es; U.S.S.R.; Germany; Sardinia; Broken Hill, 1V.S. W., Australia; Dundas, Tasmania. Morocco:...Secondary mineral in Cu and P b deposits . Chile; Broken Hill, N.S. W., A ustralia. Boleo, Baja California: magnificent...England; Urngban, SĀ¾ eden. Franklin and Sterling Hill, Ne,,Ā· Jerse_i: in fine crystals. Iwate and Yamagata |
 | | Book |
| nucleation initiation of crystal growth. nucleus the central portion of an atom, positively charged and containing...relationship of the particles to a solar system with a central nucleus surrounded by circling electrons at different...each being the reflection of the other across a central plane which is known as the ātwinning planeā. Other...amplified and drives the needle of the meter. The central copper section of the thermocouple is extended...to the market. The intention is to build up a central register of stones in North America. In operation |
| | Book |
| nucleation initiation of crystal growth. nucleus the central portion of an atom, positively charged and containing...relationship of the particles to a solar system with a central nucleus surrounded by circling electrons at different...each being the reflection of the other across a central plane which is known as the 'twinning plane'. Other...amplified and drives the needle of the meter. The central copper section of the thermocouple is extended...to the market. The intention is to build up a central register of stones in North America. In operation |
