 | | Journal (article/letter/editorial) | | minerals Article Gems and PlacersâA Genetic Relationship Par Excellence Harald G. Dill Mineralogical...the major part among the placer-type gemstones (almandine, apatite, (chrome) diopside, (chrome) tourmaline...absence of heavy metals), can also appear in some placers and won for a profit (agate, amethyst, citrine...trap-site of gemstones (residual, eluvial, colluvial, alluvial, deltaic, aeolian, and marine shelf deposits)...that matter during accumulation of gemstones in placers are their intrinsic value controlled by the size |  | Ragozin, Alexey, Zedgenizov, Dmitry, Shatsky, Vladislav, Kuper, Konstantin, Kagi, Hiroyuki (2019) Deformation Features of Super-Deep Diamonds. Minerals, 10 (1) 18 doi:10.3390/min10010018 | Journal (article/letter/editorial) | | (sublithospheric) diamonds from SaĂ”-Luiz river placers (Brazil) and from alluvial placers of the northeastern Siberian...bridgmanite (Mg,Fe)SiO3 + jeffbenite (former tetragonal almandineâpyrope phase, TAPP) (Mg,Fe)3 Al2 Si3 O12 + Ca-perovskite...various worldwide localities [13â15], i.e., alluvial placers the SaĂ”-Luiz in Brazil [16,17] were reported...various worldwide localities [13â15], i.e.,of alluvial placersriver of the SaĂ”-Luiz riverand in northeastern...mm mm in in size) size) from from alluvial alluvial placers placers of of SĂŁo-Luiz SĂŁo-Luiz In (Juina |  | | Book | | PHENOMENAL CRYSTALS ILIA DELEFF was born in 1921 in Bulgaria. He left his country after the Second World War...in Paris, and in 1985 he donated to his country Bulgaria a similar personal collection of unique giant...MUSEUM IN SOFIA 66 OTHER COLLECTIONS OF MINE IN BULGARIA 71 COLLECTIONS IN OTHER CITIES AROUND THE WORLD...Shumen), situated in the beautiful valley of the river Goljama Kamchija, not far from the Black Sea, famous...with my brothers along the beautiful banks of the river, where the birdsâ songs and the abundant vegetation |  | | Journal (article/letter/editorial) | | Koiva River basin, in the Urals. Pavel Popov, a fourteenyear-old boy, while panning the river sediments...it at the Bysert factory, in what was then Perm Province. Three days later another finding followed, and...Yakutian diamond province; 2 = Uralian diamond province; 3 = Voronezh diamond province; 4 = Arkhangelâsk...Arkhangelâsk diamond province; 5 = Far East diamond province (predicted) (after Kharkiv, Zinchuk, and Zuev 1997)...geologists discovered rich diamond placers in the Koiva and Vizhai river valleys. The newly formed Uralian |  | | Journal (article/letter/editorial) | | paper Pegmatitic Nb-Ta oxide minerals in alluvial placers from Limbach, Bratislava Massif, Western Carpathians...of granitic pegmatite origin was found in alluvial placers near Limbach, the Bratislava granitic massif...geological occurrences (for example in elluvial to alluvial deposits), where information about the parental...scription of Nb-Ta oxide mineralization in alluvial placers near Limbach in the Bratislava Granitic Massif...from the heavy-mineral fraction of recent alluvial placers of the Limbach Brook, at SlneÄnĂ© Valley in |  | | Thesis/Dissertation | | chrysoberyl are also found. Most gems are found in alluvial marble gravels by means of panning, tunneling...whereas southern boundary is about 3 km S of the municipality of Mogok at about 22Ë 52' N. The Eastern boundary...erosive processes produced the residual, colluvial, alluvial and other gemstone deposits. Metamorphism played...kaolin, a clay mineral. Occurred gem minerals are almandine, iolite and fibrolite. A B C D Figure 9....Momeik and then Mogok. Most gems are found in alluvial marble gravels by means of panning, tunneling |  | | Journal (article/letter/editorial) | | com/loi/tigr20 The Kamchatka ultrabasic volcanic province a a V.K. Rotman , B.A. Markovskiy & M.I. Khotina...Khotina (1973) The Kamchatka ultrabasic volcanic province, International Geology Review, 15:9, 1015-1024...page/terms-and-conditions The Kamchatka ultrabasic volcanic province Downloaded by [UQ Library] at 18:03 03 February...the Turnrok ridge, on the shores of the Tolbachik river (7, 4, 14). However, as a result of geologic work...recognize here a specific ultrabasic volcanic province. The East Kamchatka range is divided into a series |  | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | ruby deposits, i.e., placers are termed sedimentary-related (Type III). These placers are hosted in sedimentary...Czech Republic (âred garnetâ, either pyrope, almandine, and/or spessartite). However, as rubies, spinels...of America; (D) Barrington Tops alluvial ruby Barrington Tops alluvial ruby concentrate, crystals up to...Luis-Juina River. Colombia: (22) Mercaderes-Rio (20) Mbuji-Mayi. Brazil: (21) SĂŁo Luis-Juina River. Colombia:...kimberlite [43]. bloodâ. While there is no globally The placers most desired color for rubies known in the trade |  | | Journal (article/letter/editorial) | | hydrothermal quartz veins. Many deposits in the province occur in siliciclastic metasedimentary, or metabasaltic...platinum) province; and the early Neoproterozoic (1 Ga) Kibara rare metal and gold province that is the...application of modern concepts and technologies, this province is drastically underexplored. Keywords: Gold,...felsic intrusions. Geographically, this giant metal province comprises Kivu and Maniema, as well as major portions...Cahen et al., 1984) and as the Kibara Metallogenic Province (Pohl, 1987, 1994), the proper noun being derived |  | | Book | | Zappettini Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina:...Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast AsiaâTrace Element Geochemistry.... . . . . . . . . 347 Harald G. Dill Gems and PlacersâA Genetic Relationship Par Excellence Reprinted...pegmatite situated in the Borborema Pegmatitic Province (BPP) from Rio Grande do Norte in Northeast Brazil...environment of samples collected from secondary alluvial deposits [18â22]. There are two contributions |  | Kislov, Evgeniy V., Aseeva, Anna V., Vanteev, Vladislav V., Sinyov, Anton Yurievich, Eliseeva, Olga A. (2022) Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia. Minerals, 12 (5) 509 doi:10.3390/min12050509 | Journal (article/letter/editorial) | | pyrope and chrysolite in alluvialâdeluvial, alluvialâproluvial, and alluvial deposits on the slopes of...magmatic deposits. Sapphires are extracted from placers associated with intraplate alkali basalts in Australia...Naryn-Gol Creek at the left tributary of the Darhintuy River in the southern part of the Dzhida volcanic field...Pleistocene alluvial deposits of the I and II terrace above the floodplain and Holocene alluvial, eluvialâdiluvial...junction of the Naryn-Gol Creek and the Darhintuy River (Mouth Trench, Figure 3) and further upstream in |  | | Journal (article/letter/editorial) | | composition) metamorphic rock with red to pink garnet (almandineâpyrope) in a green matrix of sodiumrich pyroxene...Chromite is a heavy mineral common to many beach and alluvialâïŹuvial placer deposits (Hokkaido, Japan, Great...ChĂ©telat (1947). of the garnierites of the Uralian province are of hypogene rather supergene origin (chrysotile...and CuâNi deposits in ultramaïŹc rocks, and in placers â Rustenburgite Pt2.25Pd0.75Sn â Atokite Pd2.25Pt0...and in placers âą PGM arsenides â Sperrylite PtAs2 (56% Pt) in ultramaïŹc rocks, and in placers âą PGE antimonides | | | Journal (article/letter/editorial) | | composition) metamorphic rock with red to pink garnet (almandineâpyrope) in a green matrix of sodiumrich pyroxene...Chromite is a heavy mineral common to many beach and alluvialâïŹuvial placer deposits (Hokkaido, Japan, Great...ChĂ©telat (1947). of the garnierites of the Uralian province are of hypogene rather supergene origin (chrysotile...and CuâNi deposits in ultramaïŹc rocks, and in placers â Rustenburgite Pt2.25Pd0.75Sn â Atokite Pd2.25Pt0...and in placers âą PGM arsenides â Sperrylite PtAs2 (56% Pt) in ultramaïŹc rocks, and in placers âą PGE antimonides |  | | Report (issue) | | deposits ______ -- __ --- ____ -_-_--Lacustrine placers ____ -----------------_ Ghana-----------------...___________________ _ Cape of Good Hope Province ___________ _ Transvaal Province ____ -_-_------------Natal __...rocks_--------Fluvial deposits ___ -----------_--------Beach placers __ -- ___ ---- ____ --------- __ China _______...sedimentary rocks_--------Fluvial placers __ ----------------------Beach placers __ -------- __ -----------...____ --------------Fossil placers _____ ----- ___________ _ Present stream placers _____________ _ Connecticut_____________ |  | Rahman, M. A., Pownceby, M. I., Haque, N., Bruckard, W. J., Zaman, M. N. (2016) Valuable heavy minerals from the Brahmaputra River sands of Northern Bangladesh. Applied Earth Science, 125 (3) 174-188 doi:10.1080/03717453.2015.1115159 | Journal (article/letter/editorial) | | Valuable heavy minerals from the Brahmaputra River sands of Northern Bangladesh Downloaded by [Universite...samples collected from sand bars of the Brahmaputra River in northern Bangladesh revealed that the HM assemblage...Keywords: Valuable heavy minerals, Brahmaputra river, Bangladesh Introduction Heavy mineral (HM) sands...exception is the Gbangbama District in the southern province of the Republic of Sierra Leone, where rutile...rutile is exploited from proximal alluvial placers (Force 1991). More often, ïŹuvial deposits are exploited |  | | Book | | 142 References 143 CHAPTER 8 PLACERS 147 Pleistocene to Recent Placers Paleoplacers 153 References 153...161 170 179 Dabie Shan, China 179 Geologic Province 181 Saxonian Erzgebirge, Germany 188 References...fields south of the White Sea 15 1.7 Diamond placers in Venezuela 16 1.8 Location of main diamond-bearing...from kimberlite bodies of the Yakutian diamond province 114 6.16 Ratio of Cr2O3, Al2O3, and MgO in ilmenite...from kimberlite bodies of the Yakutian diamond province 115 6.17 Increasing O2 activity with decrease |  | | Journal (article/letter/editorial) | | yellowish-green cubic diamond crystals in Paleogene Ti-Zr placers near the northern margin of the Kokchetav Massif...Speciation of major minerals is as follows: pyrope-almandine (garnet), salite (pyroxene), hornblende (amphibole);...fine-grained rocks composed mainly of garnet (pyrope-almandine) and pyroxene (omphacite). Boudins of this rock...clinopyroxene (diopside-salite), garnet (pyrope-almandine to grossular) and, less frequently, amphibole...Garnetmica gneiss consists of garnet (pyrope-almandine, with minor grossular), biotite and quartz-feldspar |  | | Report (issue) | | 1. 72) Quartz Plagioclase Hornblende Biotite Almandine Opaque 1.03 1.70 .57 Madras charnockites (Howie...17 15 40 6 3 Hypersthene Augite Hornblende Almandine Plagioclase Orthoclase Magnetite, Ilmenite Biotite...grade (percent) 13.5 âą Lakehurst, N. J.2 Fossil river ( ?) sand! placer Altered ilmenite --1.5 + Trail...muscovite as an indication of metamorphic grade in almandine-amphibolite facies rocks from Sudbury, Ontario:...---------------------Streaxn placers ------------------------------Beach placers ------------------------ |  | | Book | | Lace and Voorspoed 3. Alluvial Deposits 3.1 Lichtenburg and Schweizer Reneke Alluvial Deposits 3.2 The Lower...Lower Vaal and Middle Orange River 3.3 Bushmanland 3.4 The Lower Orange River 3.5 West Coast Onshore Deposits...primary (kimberlites and lamproites) and secondary (alluvial and marine). In 1995, their relative production...(kimberlite) 8.63 million carats (89% of total), alluvial 960,000 carats (10%), and marine 90,000 carats...diamond in river sediments are obviously of direct importance in the formation of economic alluvial diamond |  | | Journal (article/letter/editorial) | | described by Regis and Sand (11), from the Green River alluvium, Wyoming, as a low temperature cubic ()...BAUER, ET AL. &V y' 170 0 rope -almandine garnet with the almandine dominant, disthene, pleonast, diopside...communication), moissanite occurs also in alluvial placers Of Kazakhstan. Its source is unknown; there |  | | Book | | feldspar. That is why they are deposited by flowing river water before the normal quartz-rich sand. They are...somewhat concentrated. Such alluvial deposits of economic minerals are called placers. The specific gravity...(milky quartz) commonly found as pebbles rounded by river- or wave-action. Normally white, but may be brownish...and boulders of rock found on the beach and in river gravels can be seen to be cut through by white quartz...Bohemia, Alps, UK, Finland, USA. Fig. 42 shows almandine garnet crystals in mica schist from the Zillertal |  | Dill, H. G., Khishigsuren, S., Majigsuren, Y., Myagmarsuren, S., Bulgamaa, J., Hongor, O. (2006) A Review of the Non-metallic Industrial Minerals of Mongolia: The Impact of Geological and Geographical Factors on their Formation and Use. International Geology Review, 48 (2) 129-173 doi:10.2747/0020-6814.48.2.129 | Journal (article/letter/editorial) | | gemstone deposits; (5) coarse-grained aggregates (alluvial-fluvial); (6) fine-grained aggregates (fluvial-aeolian);...position of drainage systems of the Kerulen (Kherlen) River (1) and the study site for Quaternary deposits in...sediments was carried out during the study of placers. It was followed by magnetic separation and heavy... A. Cross section through a steppe river drainage basin. Alluvial channels (5â 7) and strath terraces...terraces (2â4) of the Egiin gol (river) south of Choevsgul Nuur. The number â1â marks the level of the ancient |  | ChudĂk, Peter, Uher, Pavel, Gadas, Petr, Ć koda, Radek, PrĆĄek, Jaroslav (2011) Niobium-tantalum oxide minerals in the JezuitskĂ© Lesy granitic pegmatite, Bratislava Massif, Slovakia: Ta to Nb and Fe to Mn evolutionary trends in a narrow Be,Cs-rich and Li,B-poor dike. Mineralogy and Petrology, 102 (1) 15-27 doi:10.1007/s00710-011-0163-9 | Journal (article/letter/editorial) | | Accessory minerals include common garnet (50â52 mol.% almandine and 47â49 mol.% spessartine), gahnite, fluorapatite...minerals from the Limbach pegmatite-bearing alluvial placers situated in the Bratislava granitic massif...Sn-rich ixiolite or ferrowodginite inclusions in alluvial columbite-tantalite grains from Limbach in the...Nanping No. 31 dyke of granitic pegmatite, Fujian province, southeastern China. Can Mineral 47:1195â1212...(2007) Pegmatitic Nb-Ta oxide minerals in alluvial placers from Limbach, Bratislava massif, Western Carpathians |  | | Journal (issue) | | Alexander N. Ageev ANALCIM Đ FROM THE NIZHNAYA TUNGUSKA RIVER Les Wagner, Jr JEFFREY A. SCOVIL - GEM AND MINERAL...inclusions. ĐĄgophĐŸtolĐžmiпДsceRĐ” (77Đ). Liaonin Province, China. Specimen: Yana Baa. (right) Photoluminescence...crystal (about Đ Ń Ń across) with vacuoles. Liaonin Province, China, Specimen: Yana Bao. (left) Laser luminescence...vacuoles and mineral inclusions (10'). Liaonin Province, China. Specimen: Boo Yana. (left) Luminescence...found among the Chinese crystals from the Liaonin Province, Northeastern China (samples of these crystals |  | | Journal (issue) | | sources: Kuraman, Namibia; and Xichuan, Henan Province, China. Mr. Pieters discovered the Namibian pietersite...AZ. Zhong H. (1994) Gemstone sources in Henan Province. China Lapidary, Vol. 9, No. 3, pp. 43â46. GEMS...ciborium is decorated with 17 colored stones: 10 almandine garnets, four grossular garnets, and three sapphires...National Museum. sition), all were close to almandine and grossular, respectively (see table DD-1 and...Using Raman spectroscopy, we found that 10 were almandine (identified by Father Tonassini as rubies), four |
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