 | | Journal (article/letter/editorial) | | characteristics of emeralds from the Leydsdorp area, South Africa J.E. Lum, K.S. Viljoen and B. Cairncross...Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: jullieta.lum@gmail.com; fanusv@uj.ac...Society of South Africa Abstract The worldās oldest emerald deposit occurs in the Gravelotte-Leydsdorp area...area of the Limpopo Province of South Africa. Emeralds have been mined from the main emerald working, the...characteristics of 57 low-quality emeralds from the Leydsdorp area, Murchison Greenstone Belt. The emeralds |  | | Book (edition) | | Southern Africa a Collectorās Guide ā Rocks, Minerals and Gemstones of Southern Africa & ā - ... T ~ '' .rats en&nes L of Southern Africa A Collectorās Guide - Struik Publishers (an operating...suggestions and advice. Authorās Preface Southern Africa has much to offer the amateur geologist, whatever...best plan is to take local advice wherever you are. 9 In small places try the local police station first...usually helpful and will know it there are any local gem clubs and how to get in touch with them. There |  | Jaguin, Justine, Boulvais, Philippe, Poujol, Marc, Bosse, ValĆ©rie, Paquette, Jean-Louis, Vilbert, David (2013) Albitization in the Antimony Line, Murchison Greenstone Belt (Kaapvaal Craton): A geochemical and geochronological investigation. Lithos, 168. 124-143 doi:10.1016/j.lithos.2013.01.010 | Journal (article/letter/editorial) | | volcano-sedimentary belts within the Kaapvaal Craton in southern Africa. Among the diverse ore deposits found within the...Provinces (review in Robert et al., 2005), in western Africa (BĆ©ziat et al., 2008), in Australia (Witt, 1992)...1992), and in the Murchison Greenstone Belt (South Africa), where Jaguin et al. (2012b) recently dated gold...GREENSTONE BELT a Johannesburg Kaapvaal Craton South Africa Baderoukwe granodiorite Rubbervale Formation...Line Weigel / MacKop Formations Antimony Line Leydsdorp/ Mulati Formations Albitites Maranda granodiorite |  | | Journal (article/letter/editorial) | | India, Madagascar, Namibia, Nigeria, Pakistan, South Africa, Spain, Tanzania, the United States, and Zimbabwe...Canada, the Muzo mine in Colombia, the Mohmand district in Pakistan, and Norway. Beryl has a wide stability...Valley) as being related to the intrusion of tourmaline-bearing leucogranite into serpentinite bodies...the development of albite, muscovite, biotite, tourmaline, and pyrite. Fluid inclusions in the emeralds...abandoned tin deposit near Emmaville in northern New South Wales in 1890 (compositions of Australian emeralds |  | | Journal (article/letter/editorial) | | the formation of gem-quality diamonds requires local enrichment of carbon (Stachel 2007). Most gems,...deposits (notably Habachtal in Austria, Leydsdorp in South Africa, and Franqueira in Spain; Grundmann and...ruby, the details of the atomic environment and local charges around the chromium ion result in a strong...spectrum. The opposite occurs in emerald, in which the local environment is more relaxed, resulting in a looser...in normal-sized facetable gems (e.g. black in tourmaline, over-dark green in emerald, brownish overtones |  | | Journal (article/letter/editorial) | | interest in geological study by directing attention to local phenomena which otherwise would have been missed...the previous ReviewsāThe Geology of the London District. 133 chapter it seems very unnecessary for the...glaciation. F. H. A. M. THE GEOLOGY OP THE LONDON DISTRICT. By H. B. WOODWARD. Second Edition, revised...this size could hardly cover the details of the district; and in its old form the memoir was an attractive...IN THE LEYDSDORP DISTRICT OF THE EASTERN TRANSVAAL. By A. L. HALL, M.A. Trans. Geol. Soc. South Africa |  | Baksheev, Ivan A., Trumbull, Robert B., Popov, Mikhail P., Erokhin, Yuri V., Kudryavtseva, Olesya E., Yapaskurt, Vasily O., Khiller, Vera V., Vovna, Galina M., Kiselev, Vladimir I. (2018) Chemical and boron isotopic composition of tourmaline from the Mariinsky emerald deposit, Central Urals, Russia. Mineralium Deposita, 53 (4) 565-583 doi:10.1007/s00126-017-0759-z | Journal (article/letter/editorial) | | ARTICLE Chemical and boron isotopic composition of tourmaline from the Mariinsky emerald deposit, Central Urals...# Springer-Verlag GmbH Germany 2017 Abstract Tourmaline is abundant at the Mariinsky schisthosted emerald...phlogopite veins (type 2). The Ca content in tourmaline is influenced by the host rocks (ultramafic and...crystallized before tourmaline (amphibole, fluorite, margarite). The Na concentration in tourmaline depends on...influences the contents of Li, Zn, Ni, and Co in tourmaline. Type 1 tourmalines associated with phlogopite |  | | Journal (article/letter/editorial) | | ReviewsāThe Geology of the London District. 133 chapter it seems very unnecessary for the author to...glaciation. F. H. A. M. THE GEOLOGY OP THE LONDON DISTRICT. By H. B. WOODWARD. Second Edition, revised...this size could hardly cover the details of the district; and in its old form the memoir was an attractive...IN THE LEYDSDORP DISTRICT OF THE EASTERN TRANSVAAL. By A. L. HALL, M.A. Trans. Geol. Soc. South Africa...author for the margarite-corundum rocks of this district. They are holocrystalline, medium to coarse-grained |  | | Journal (article/letter/editorial) | | ReviewsāThe Geology of the London District. 133 chapter it seems very unnecessary for the author to...glaciation. F. H. A. M. THE GEOLOGY OP THE LONDON DISTRICT. By H. B. WOODWARD. Second Edition, revised...this size could hardly cover the details of the district; and in its old form the memoir was an attractive...IN THE LEYDSDORP DISTRICT OF THE EASTERN TRANSVAAL. By A. L. HALL, M.A. Trans. Geol. Soc. South Africa...author for the margarite-corundum rocks of this district. They are holocrystalline, medium to coarse-grained |  | | Journal (article/letter/editorial) | | stockworks of quartz as well as emerald, Cr-rich tourmaline and Cr, Ni-rich muscovite. Detailed petrographic...and Mg found in Cr-rich muscovite and Cr-rich tourmaline, was derived from the original ultramaļ¬c protoliths...enrichment in B and Be as well as As, Pb, Zr, Rb, Ba, W, Sn, Sr and Y. Boron and Be enrichment in these...and sulpharsenide minerals . . . . . . . 4.2.5. Tourmaline . . . . . . . . . . . . . . . . . . . 4.2.6....Pakistan (Snee and Kazmi, 1989), NE Afghanistan and South Tajikistan, and these are considered to be parts |  | 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) | | phlogopite, blue apatite crystals (to 1 cm), and black tourmaline crystals (to 2 cm). The beryl occurs as euhedral...dāapatite bleue atteignant 1 cm et des cristaux de tourmaline noire atteignant 2 cm. Le bĆ©ryl se prĆ©sente en...display an increasing thermal metamorphic grade from south to north. Breaks & Moore (1992) subdivided the Ghost...of younger phases, distinguished by muscovite, tourmaline, garnet, and potassium-dominant pegmatites, also...also with abundant muscovite and tourmaline. The part of the batholith closest to the emerald showing |  | Jaguin, J., Poujol, M., Boulvais, P., Robb, L. J., Paquette, J. L. (2012) Metallogeny of precious and base metal mineralization in the Murchison Greenstone Belt, South Africa: indications from UāPb and PbāPb geochronology. Mineralium Deposita, 47 (7) 739-747 doi:10.1007/s00126-012-0422-7 | Journal (article/letter/editorial) | | mineralization in the Murchison Greenstone Belt, South Africa: indications from UāPb and PbāPb geochronology...metallotect in the northern Kaapvaal Craton (South Africa), hosting several precious and base metal deposits...Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK J. L. Paquette UMR...Antimony Line . Kaapvaal Craton . Murchison range . South Africa Introduction The 3.09 to 2.97 Ga Murchison...represented by the Mashishimale pluton, emplaced to the south of the belt and dated at ca. 2.67 Ga (Poujol 2001; |  | | Journal (article/letter/editorial) | | June 2003, Vol. 67(3), pp. 517ā533 Chromian tourmaline and associated Cr-bearing minerals from the Nevado-FilaĢbride...28, 23700 Linares, Spain ABSTR ACT Chromian tourmaline, in association with other Cr-bearing minerals...Complex, SE Spain. Electron microprobe analyses of tourmaline and coexisting minerals document both chemical...irregular distribution of Cr at grain scale. Tourmaline is Na-rich dravite, with average Mg/(Mg+Fe) ratios...dolomitic and ankeritic marbles, respectively. Tourmaline contains small but significant concentrations |  | Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) | | Precambrian series in Eastern Brazil, Eastern Africa, South Africa, Madagascar, India, and Australia, and younger...Mountain River; 16: Lened; 17. Tsa da Gliza. South Africa: 18. Gravelotte. Zimbabwe: 19. Sandawana, Masvingo...[18], the Muzo mine in Colombia [1], the Mohmand district in Pakistan [1], and Eidswoll in Norway [13]....unclassified, such as the Gravelotte (Leydsdorp) deposit in South Africa [58]. Schwarz et al. [60] classified...Afghanistan (Tawak) India (Rajhastan, Gubaranda) South Africa (Gravelotte) Zambia (Kafubu, etc.) Tanzania |  | | Book (edition) | | OF OF SOUTH AFRICA MINES GEOLOGICAL SURVEY MINERAL RESOURCES OF REPUBLIC OF THE SOUTH AFRICA...Second World War, and partly as a result of it, South Africa experienced vast industrial expansion. This...official āhandbook on the mineral resources of South Africa, it has become necessary to revise, or rather...great diversity and magnitude of South African mineral deposits and local mining operations, the Economic...Chamber of Mines of South Africa with Mr G. H. Grange as co-ordinator, and the South, African mining industry; |  | | Journal (article/letter/editorial) | | African literature is essentially concerned with local areas within each country, only one country is represented...The geology and physiography of parta of Ncheu, South Syasa and Upper Shire districti: Nyaaaland Geol...Afr.: 1 quart&e. Bosazw, V. L. (19378) Notes on South African materiels for silica refractories: Geol...\ā. L. (1937b) The physical properties of some South African raw materials for silica bricks: Chem. Met...from the Goodhouse-Pella area, Samaqualand, South Africa: Roy. Sot. S. Afr. Tr. 2B, pt. 2, 91-112. S |  | ZachariĆ”Å”, J., Å½Ć”Äek, V., PudilovĆ”, M., MachoviÄ, V. (2005) Fluid inclusions and stable isotope study of quartz-tourmaline veins associated with beryl and emerald mineralization, Kafubu area, Zambia. Chemical Geology, 223 (1) 136-152 doi:10.1016/j.chemgeo.2004.12.023 | Journal (article/letter/editorial) | | inclusions and stable isotope study of quartz-tourmaline veins associated with beryl and emerald mineralization...numerous pegmatite dykes and epigenetic quartz-tourmaline veins in Mg-rich metabasites. Where these dykes/veins...emeralds. Three types of hydrothermal quartz-tourmaline mineralization were identified: banded finegrained...oxygen isotope composition (y18O) of quartz and tourmaline is quite homogeneous (10.9 F 1x and 8.4 F 0.7x...to +7x SMOW. Three evolution stages of quartz-tourmaline F beryl mineralization are inferred from fluid |  | | Journal (article/letter/editorial) | | plagioclasequartz-biotite-garnet gneiss and cross-cutting tourmaline-plagioclase veins situated adjacent to lenses...probably pre-dated the formation of metamorphic tourmaline-plagioclase veins during the same metamorphic...B and Zn required to form chrysoberyl, beryl, tourmaline and zincian spinels may have been released by...gneiss (including highly micaceous enclaves), and tourmaline-plagioclase veins exposed within ~3.5 m deep...granulite-facies metamorphic conditions. Regional and local geological setting The Archaean Yilgarn Craton of |  | Marshall, Dan, Groat, Lee, Giuliani, Gaston, Murphy, Don, Mattey, Dave, Ercit, T.Scott, Wise, Michael A, Wengzynowski, William, Eaton, W.Douglas (2003) Pressure, temperature and fluid conditions during emerald precipitation, southeastern Yukon, Canada: fluid inclusion and stable isotope evidence. Chemical Geology, 194 (1) 187-199 doi:10.1016/s0009-2541(02)00277-2 | Journal (article/letter/editorial) | | is quartz and tourmaline with variable sized alteration haloes consisting of tourmaline, quartz, muscovite...hosted within the alteration haloes of quartzā tourmaline veins that crosscut the Devono-Mississippian...quartz veins of 1 m in width to narrower quartz ā tourmaline veins. Due to the limited exposure, the maximum...not been determined. Some quartz and quartz ā tourmaline veins cut the granite indicating that at least...emerald zones consist of quartz ā tourmaline veins with a muscovite ā tourmaline alteration halo (Fig. 2). The |  | Salvi, Stefano, Giuliani, Gaston, ANDRIANJAKAVAH, Prosper Rakatovao, Moine, Bernard, Beziat, Didier, Fallick, Anthony (2017) Fluid Inclusion and Stable Isotope Constraints On the Formation of the Ianapera Emerald Deposit, Southern Madagascar. The Canadian Mineralogist, 55 (4) 619-650 doi:10.3749/canmin.1700017 | Journal (article/letter/editorial) | | mostly within metasomatic phlogopitite and quartz-tourmaline veins, developed within lenses of MUMR. Recent...al. 2009). Considerations of the chemistry of tourmaline and scapolite associated with emerald and beryl...of at least part of the pegmatitic elements and local mixing with a metamorphic CO2-rich fluid, leading...deposits, ļ¬uid inclusions, O-H isotopes, scapolite, tourmaline, P-T-X conditions, metasomatism. INTRODUCTION...and hydrogen isotopic compositions of emerald, tourmaline, and fuchsite suggest that the mineralizing ļ¬uid |  | Groat, L. A., Marshall, D. D., Giuliani, G., Murphy, D. C., Piercey, S. J., Jambor, J. L., Mortensen, J. K., Ercit, T. S., Gault, R. A., Mattey, D. P., Schwarz, D., Maluski, H., Wise, M. A., Wengzynowski, W., Eaton, D. W. (2002) MINERALOGICAL AND GEOCHEMICAL STUDY OF THE REGAL RIDGE EMERALD SHOWING, SOUTHEASTERN YUKON. The Canadian Mineralogist, 40 (5) 1313-1338 doi:10.2113/gscanmin.40.5.1313 | Journal (article/letter/editorial) | | major occurrence of emerald in the Finlayson Lake district of southeastern Yukon. The Regal Ridge showing... overlapping mass of fine, dark tourmaline crystals. The tourmaline crystals are locally associated with...disseminated sulfides apparently coincides with the tourmaline zone, which is surficially marked by ochreous...beryl crystals up to 4 cm in length occur in tourmaline zones and, rarely, in the quartz veins. Some...homogenization. The ā¦18O values for coexisting quartz and tourmaline from the quartz veins yield temperatures of formation |  | | Journal (article/letter/editorial) | | Li-, Ti-, and B-bearing minerals coupled with local contamination by Cr and V is largely penecontemporaneous...occur together in the same vein or cavity. Although local differences within cavities are present, a generalized...among quartz, albite and muscovite crystals. Tourmaline forms lustrous, black, stubby crystals that are...characterized by steep rhombohedral faces. Although tourmaline is mostly associated with emerald mineralization...conventional ZAF correction. The structural formula of tourmaline was calculated on the basis of 31 anions, assuming |  | | Report (issue) | | Publioati9ns are sold- at the Patent Office, 25, South,ampton Buildings, Chancery Lane, London, W.C.2....~MPIRE\ United Kingdom ā¢ā¢ ā¢ .... ā¢ā¢ā¢ .. ~ East Africa Protectorate (Kenya Colony) ā¢ I Nyasaland ā¢ā¢ā¢...Territory (formerly German East Africa) ... ā¢ ā¢ā¢ 12 Union of South Africa ā¢ā¢ā¢ ā¢ ā¢ā¢ ā¢ā¢ ā¢ ā¢ā¢ā¢ ā¢ ā¢ā¢...iro11. They Ā·a1"e cha1"acterized by a ve1Ā·y perfect ba,sa,l cleavage, in consequence of whicl1 they can...small qu-antities were obtained from German East Africa (now Tangan3rika, Territo,r y), Bra.zil, Argentina |  | | Journal (article/letter/editorial) | | Corundum-Fuchsite Rocks in Greenstone Belts of Southern Africa: Petrology, Geochemistry, and Possible Origin ...cent Cr203), complex margarite solid solutions, tourmaline (24.9 per cent Cr203), diaspore (51.1 per cent...paragenetic differences are the lack of diaspore, tourmaline and margarite, the occurrence of kyanite (0.9...plagioclase. Both biotite and fuchsite may be rich in Ba Critical mineral assemblages indicate that the Zimbabwe...adequately by modem petrogenetic standards. In Southern Africa corundum-bearing rocks are not only rather common |  | Galbraith, C. G., Clarke, D. B., Trumbull, R. B., Wiedenbeck, M. (2009) Assessment of Tourmaline Compositions as an Indicator of Emerald Mineralization at the Tsa da Glisza Prospect, Yukon Territory, Canada. Economic Geology, 104 (5) 713-731 doi:10.2113/gsecongeo.104.5.713 | Journal (article/letter/editorial) | | Economic Geology, v. 104, pp. 713ā731 Assessment of Tourmaline Compositions as an Indicator of Emerald Mineralization...Telegrafenberg, 14473 Potsdam, Germany Abstract Tourmaline is ubiquitous at the Tsa da Glisza emerald prospect...as crystals in granites, aplites, and quartz-tourmaline veins. The principal occurrence of emerald is...is along contacts between the quartz-tourmaline veins and mafic country rocks, but it also occurs in the...the aplites. We assess the potential of using tourmaline compositions as a guide to emerald mineralization |
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