 | | Journal (article/letter/editorial) | | feldspars, zircon and Nb-Ta oxides and also include hercynite-magnetite, gahnospinel, rutile-ilmenite solid...(Hughes 1997). East Australia, South Asia (Thailand, Cambodia, Laos, Vietnam) and China yield particularly productive...Lava Plains, Queensland), Thailand (Chanthaburi), Cambodia (Pailin) and Laos (Ban Huai Sai) basalt Ā®elds...Mineral phase Analysis wt% Gahno spinel Spinel (hercynite) Columbite (Nb-rich) Ilmenorutile Uranopyrochlore...particularly in New England corundums. These include hercynite-magnetite, gahnospinel, thorite, calcic palgioclase |  | | Journal (article/letter/editorial) | | minerals (antigorite), spinel-group minerals (hercynite, magnetite, and spinel), stibnite, talc, true...alkali basalts of the Ratanakiri Volcanic Province, Cambodia. P. C. Piilonen, G. Poirier, and R. Rowe. Mineral...anorthoclase from Borkeo, Ratanakiri Province, Cambodia. Figure 2 (top right). Gem-quality anorthoclase...in alkali basalt, Borkeo, Ratanakiri Province, Cambodia. Figure 3 (bottom right). Gem-quality anorthoclase...Vattana Ram Ting Jak Monastery, Ratanakiri Province, Cambodia. 194āā ROCKS & MINERALS lithospheric mantle |  | Harris, Stephen J., Graham, Ian T., Lay, Angela, Powell, William, Belousova, Elena, Zappettini, Eduardo (2017) Trace Element Geochemistry and Metasomatic Origin of Alluvial Sapphires From the Orosmayo Region, Jujuy Province, Northwest Argentina. The Canadian Mineralogist, 55 (4) 595-617 doi:10.3749/canmin.1700015 | Journal (article/letter/editorial) | | Secondary inclusions included hematite and Mg-hercynite which formed as reaction rims surrounding three...hematite, which lined internal fractures, and Mg-hercynite, which formed reaction rims surrounding parts...from Ratnapura Balangoda (Sri Lanka), Pailin (Cambodia), Ilakak (South Madagascar), and Mogok (Myanmar)... (f) SE imagery of AC-5, with a prominent Mg-hercynite rimming the sapphire. ing elevations in Zn and...Pyrite Zircon Monazite-(La) Zircon Zircon Mg- hercynite AC-2 Pale lilac to blue AC-3 AC-4 Pale blue |  | | Journal (article/letter/editorial) | | other SE Asia suites (Thailand, Myanmar, Laos, Cambodia and Vietnam) (Intasopa et al., 1998; Pisutha-Arnond... P. LIMTRAKUN ETAL. Australia and west Pailin, Cambodia (Sutherland et a1., 1998a). The presence of three...corundums from eastern Australia and west Pailin, Cambodia. (2) Three compositional ļ¬uids were preserved...Corsilzirspite, a corundumsillimanite-zircon-hercynite rock: New eveidence on the origin of Kanchanaburi...study of Barrington, Australia, and West Pailin, Cambodia, gemļ¬elds. J. Gemmol., 26, 65 85. Sutherland, |  | | Journal (article/letter/editorial) | | magnetite crystal in the xenolith exsolved into hercynite, magnetite and hematite during cooling. It includes...include alkali feldspar, cohimbite, gahnospinel, hercynite, hornblende, ilmenite, niobium-rutfle, mica, plagioclase...A1-Ti magnetite (pinkish grey), magnetite (grey), hercynite (dark grey) and hematite (cream). Euhedral zircon...different orientations are visible (e). The hercynite is present within all the phases except the A1-Ti...appearance and containing exsolved hercynite. In places exsolved hercynite crosses magnetite-hematite boundaries |  | | Journal (article/letter/editorial) | | (sanidine), nepheline, zircon, hercynite-spinel series and magnetite-hercynite series. The ruby suite includes...oxide minerals (hematite, goethite, spinel and hercynite) and metamorphic corundum containing silicate...nepheline, zircon and spinels in the hercynite-spinel and magnetite-hercynite series) are presented in Fig....Āµm X800 c) BPEP13 500 Āµm 39mm Fig. 3. (a) Hercynite-spinel inclusion in sapphire from Ban Huai Sai...Cho (BNEP4) (transmitted light with PPL). (c) Hercynite-spinel inclusion in sapphire from Bo Phloi exposed |  | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | 1, Table 2). In the Pailin alluvial deposit (Cambodia), Sutherland et al. (1998a) and Saminpanya et...Metamorphic blue sapphires 1 ā Pailin pastel (Cambodia) 12 ā Ilakaka (S Madagascar) 13 ā Ratnapura, Balangoda...blue sapphire from alkali basalts 1 ā Pailin (Cambodia) 2 ā Houai Sai (N Laos) 3 ā Sam Sai (S Laos) Blue...Metamorphic blue sapphires 1 ā Pailin pastel (Cambodia) 12 ā Ilakaka (S Madagascar) 13 ā Ratnapura, Balangoda...blue sapphire from alkali basalts 1 ā Pailin (Cambodia) 1.4 2 ā Houai Sai (N Laos) b.d.l. 3 ā Sam Sai |  | | Journal (issue) | | (albite-anorthoclase-oligoclase), pyrochlore, hercynite spinel, and ilmenite (titanohematite series)....East Sea Buon Ma Thuot CAMBODIA THAILAND Kanchanaburi Chanthaburi CAMBODIA Pailin Krong Nang Nha...reported in sapphires from Thailand, Laos, and Cambodia are also compared in the same table. Columbite...Zircon e,h Alkali feldspar h Spinel e Pailin (Cambodia) Pyrochlore i ā Spinel g *This study, using...B Figure 11. Inclusions of black octahedral hercynite spinel (A) and euhedral rhombohedral ilmenite |  | | Journal (article/letter/editorial) | | FeO MnO MgO NiO Total Analyses Hc Mt Mf Usp Hercynite 1 range av. 0.05-0.06 1.66-2.10 25.73-27.20...7-35.3 7.3-8.0 4.1-5.4 52.7 35.0 7.7 4.8 Hercynite 2 Hercynite + range 0.02 0.91 38.58 0.00 20.75 35...13-1.05 47.76-58.11 0.00 73.1 18.5 6.1 2.2 Hercynite 1 and 2, Barrington Volcanic Province Ā§ New England...Fe-rich (Fe96 , Mg4; Table 4) and belong to the hercynite-magnetite series with an end member composition...(1981) The Pailin ruby and sapphire gemfield, Cambodia. J. Gemmol., 17, 555. RUBY-SAPPHIRE-SAPPHIR |  | | Journal (article/letter/editorial) | | Australia (MacNevin, 1972; Broughton, 1979); Pailin in Cambodia (Jobbins and Berange, 1981); Chanthaburi-Trat...columbite, rutile, pyrrhotite, boehmite, zircon, hercynite (Fe spinel), gahnospinel (Fe, Zn spinel), almandine...(1981) The Pailin ruby and sapphire gemfield, Cambodia. Ibid. 17, 555-67. Keller, P. C. (1982) The Chanthaburi-Trat |  | Baldwin, L. C., Tomaschek, F., Ballhaus, C., Gerdes, A., Fonseca, R. O. C., Wirth, R., Geisler, T., Nagel, T. (2017) Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany. Contributions to Mineralogy and Petrology, 172 (6) doi:10.1007/s00410-017-1362-0 | Journal (article/letter/editorial) | | FeO MnO MgO CaO Na2O K2O Cr2O3 Total n Spinel Hercynite ppm Na K Be Mg Sr Ti V Cr Mn Fe Zn Ga Sn Y Zr...FeO MnO MgO CaO Na2O K2O Cr2O3 Total n Spinel Hercynite ppm Na K Be Mg Sr Ti V Cr Mn Fe Zn Ga Sn Y Zr...(Fig. 5b). Abundant base metal oxides are spinelāhercynite solid solutions (Mg,Fe)Al2O4, ilmeniteā pyrophanite...pyrophanite solid solutions (Fe,Mn)TiO3 with exsolved hercynite and Nb-rutile (Nb,Ti,Fe)O2, and ilmenite ĀFeTiO3...ilmenite-pyrophanite ss showing with Nb-rich rutile and hercynite exsolutions is rimmed by spinel at the contact |  | | Journal (article/letter/editorial) | | solution between the endmembers spinel MgAl2O4 and hercynite FeAl2O4 with the average composition corresponding...are solid solutions of spinel s.s. MgAl2O4 and hercynite FeAl2O4 with compositions ranging from spl61hc27...study of Barrington, Australia, and West Pailin, Cambodia, gemfields. Journal of Gemmolgy 26, 65-85. NU...57 0.60 0.61 0.58 0.60 0.59 0.61 0.60 Hercynite 0.41 0.35 0.27 0.40 0.26 0.32 0.28 0.31 |  | | Journal (article/letter/editorial) | | calcium-dialuminate 203, 304 calcium-titanium silicates 220 Cambodia 231 Cambrian-Ordovician boundary 215 carbides...isotopes 268,291 helium-3 234 helium-3/helium-4 166 hercynite 87 heterogeneity 264 hibonite 198,212,229,253 |  | | Journal (article/letter/editorial) | | Cr2O3/ Ga2O3 ratio mostly <1, and inclusions of hercynite, ferrotantalite, pyrochlore, ferrocolumbite, zircon...plagioclase, zircon, thorite, ilmenite, rutile, hercynite, Nb-bearing rutile, and magnetite (Simonet 2000;...sapphires from the same placer area such as in Cambodia (Pailin), Madagascar (Antanifotsy-Soamiakatra) |  | | Journal (article/letter/editorial) | | Al-contents spinel group minerals were classified as hercynite. Anhedral grains of columbite-group minerals were...gravels along with precious corundum in Myanmar and Cambodia have been derived from deeply weathered alkali...interpreted to have been derived from corundum-hercynite fels, a highly desilicified rock of metabauxitic...indication Pegmatite Corundum-hercynite fels Pegmatite Pegmatite Corundum-hercynite fels No source rock indication...monazite-(Laā„Th) Fe>>Mn, Nb>>Ta ferrocolumbite Hercynite Uranian throrianite Fe-Ti bearing cassiterite |  | Sutherland, F. L., Coenraads, R. R., Abduriyim, A., Meffre, S., Hoskin, P. W. O., Giuliani, G., Beattie, R., Wuhrer, R., Sutherland, G. B. (2015) Corundum (sapphire) and zircon relationships, Lava Plains gem fields, NE Australia: Integrated mineralogy, geochemistry, age determination, genesis and geographical typing. Mineralogical Magazine, 79 (3) 545-581 doi:10.1180/minmag.2015.079.3.04 | Journal (article/letter/editorial) | | columbite-(Fe) is accompanied by Nb,Fe-rich rutile, hercynite-magnetite members, zircon and rare albite. Zircons...66.5 72.6 mag 25.9 29.0 mf 1.0 2.6 hc1.5 1.8), hercynite (hc61.4mag31.8usp5.9spl0.9) a nd a ph a s e ma...Thompson. Al0.01 0.04,Fe3+ 0 0.01,Ta0.01O2) and hercynite (n = 7; hc74.6 83.6sp11.8 21.1usp3.3 4.2chr0.5...Nb-rich rutile contains exsolution lamellae of hercynite and droplets of feldspathic and maļ¬c alkali melts...Lava Plains core examples are largely magnetiteā hercynite and magnetite ulvoĢspinel phases. Such oxides |  | | Journal (issue) | | study of Barrington, Australia, and West Pailin, Cambodia, gemfields F.L. Sutherland1, D. Schwarz2, E.A...ABSTRACT: Barrington, Australia, and West Pailin, Cambodia, basalt fields yield remarkably similar 'metamorphic'...elements, basalt, Barrington (Australia), Pailin (Cambodia) Introduction Fast Australia and South East Asia...Barrington in East Australia and West Pailin in Cambodia, and show that they contain mixed ruby and sapphire...lines, with with gem-barren drainages shown as Cambodia. Gem-bearing drainage is shown as continuous Volcanic |  | Zaw, Khin, Sutherland, F. L., Dellapasqua, F., Ryan, C. G., Yui, Tzen-Fu, Mernagh, T. P., Duncan, D. (2006) Contrasts in gem corundum characteristics, eastern Australian basaltic fields: trace elements, fluid/melt inclusions and oxygen isotopes. Mineralogical Magazine, 70 (6) 669-687 doi:10.1180/0026461067060356 | Journal (article/letter/editorial) | | inclusions in these sapphires (anorthoclase, hercynite, spinel, ilmenorutile) also typify intermediate...spinel-sapphirine-ruby facies suite from western Palin, Cambodia, even in its oxygen isotope values (Giuliani et...study of Barrington, Australia and West Pailin, Cambodia, gemļ¬elds. Journal of Gemmology, 26, 65 85. Sutherland |  | | Journal (issue) | | Kanchanaburi, Thailand (Vichit et al., 1978); Pailin, Cambodia (Jobbins and Berrange, 1981); and Monghlzak, Myanmar...and allzali. In GEMS & GEMOLOGY Fall 1995 CAMBODIA. Figure 2. To date, the most important sapphire-producing...(Fe, S) Magnetite-hercynite (spinel), (Fe, A l l Si, Ti, Mn Zn) Chromite-hercynite (spinel) (Fe, Cr,...pyrrhotite. Severely corroded crystals of magnetite-hercynite (spinel) had a "brassy" color and strong iridescence...octahedral crystals were identified as chromite-hercynite (spinel).Table 1 gives the major and minor elements |  | | Journal (issue) | | Pailin (now in Cambodia). With the loss of Pailin in 1907 to French Indochina (and then Cambodia), the mining... But ruby mining also extended rapidly inside Cambodia. In 1979, after the Vietnamese invasion of the...allowed Thai miners to work the ruby deposits inside Cambodia around Pailin and Samlaut. In the 1990s, because...not healed by filled with glassy borax residues. Cambodia, Vietnam, Tanzania: Survival of the Fittest With...side of the border, some Thai miners moved to Cambodia, but others moved to deposits discovered in Vietnam |  | Graham, Ian, Sutherland, Lin, Zaw, Khin, Nechaev, Victor, Khanchuk, Alexander (2008) Advances in our understanding of the gem corundum deposits of the West Pacific continental margins intraplate basaltic fields. Ore Geology Reviews, 34 (1) 200-215 doi:10.1016/j.oregeorev.2008.04.006 | Journal (article/letter/editorial) | | Weldborough1 mag. sapphire Anorthite, oligoclase, hercynite, chromite, zircon, molybdenite, ferrocolumbite...clinopyroxene, garnet Alkali feldspar, zircon, monazite, hercynite, Mn-ilmenite, columbite?, nepheline, calcite,...Australia; Denchai, Prae and Bo Ploi, Thailand; Pailin, Cambodia; Dak Nong, Vietnam) generally have values from...study of Barrington, Australia and West Pailin, Cambodia, gemļ¬elds. Journal of Gemmology 26 (2), 65ā85 |  | Sutherland, Lin, Graham, Ian, Yaxley, Gregory, Armstrong, Richard, Giuliani, Gaston, Hoskin, Paul, Nechaev, Victor, Woodhead, Jon (2016) Major zircon megacryst suites of the Indo-Pacific lithospheric margin (ZIP) and their petrogenetic and regional implications. Mineralogy and Petrology, 110 (2) 399-420 doi:10.1007/s00710-015-0421-3 | Journal (article/letter/editorial) | | mining target, as in the Ratanakiri deposits, Cambodia, where zircon yields effective heat-treatment...= Central Kalimantan; 20 = South Vietnam; 21 = Cambodia; 22 = Chanthanburi-Trat region, Thailand; 23 =...Corsilzirspite, a corundum-sillimanite-zircon-hercynite rock: New evidence on the origin of Kanchanaburi...295:251ā261 Smith MH, Balmer WA (2009) Zircon mining in Cambodia. Gems Gemol 45(2):152ā154 Sun Z, Zhong Z, Keep...characterisation of gem zircon from Ratanakiri, Cambodia. CORALS 2013 (Conference on Raman and Luminescence |  | Birch, W. D., Barron, L. M., Magee, C., Sutherland, F. L. (2007) Gold- and diamond-bearing White Hills Gravel, St Arnaud district, Victoria: age and provenance based on UĀ āĀ Pb dating of zircon and rutile. Australian Journal of Earth Sciences, 54 (4) 609-628 doi:10.1080/08120090701188996 | Journal (article/letter/editorial) | | uniform Mg-rich compositions along the spinel ā hercynite join, with a small magnetite component (Figure...Al-rich with compositions along the pleonaste ā hercynite join and have low Ti and Cr contents (Selverstone...study of Barrington, Australia, and West Pailin, Cambodia, gemfields. Journal of Gemmology 26, 65 ā 85. |  | Voudouris, Panagiotis, Mavrogonatos, Constantinos, Graham, Ian, Giuliani, Gaston, Melfos, Vasilios, Karampelas, Stefanos, Karantoni, Vilelmini, Wang, Kandy, Tarantola, Alexandre, Zaw, Khin, Meffre, Sebastien, Klemme, Stephan, Berndt, Jasper, Heidrich, Stefanie, Zaccarini, Federica, Fallick, Anthony, Tsortanidis, Maria, Lampridis, Andreas (2019) Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis. Minerals, 9 (1) 49 doi:10.3390/min9010049 | Journal (article/letter/editorial) | | colored spinel, which forms solid solution between hercynite and gahnite, has been reported with chlorite and/or...along the FeāTi line and follow the FeāTi Pailin (Cambodia) of magmatic blue sapphires. Minerals 2019,...Feratio content slightly to sapphires from Pailin (Cambodia)from and Pailin Ilmen in their andistheir Fe higher...Gorgona/Xanthi arefrom plotted in the MAF field, (Cambodia) and aIlmen (Russia).ofFinally, a few analyses...and Winza and basaltic-type from Thai (Thailand-Cambodia border region). border The majority of the (Tanzania) |  | | Book | | Thailand/Cambodia ruby 439 Characteristics ofThai/Cambodian sapphire 442 Bibliography-Thailand/Cambodia 450... Chapter 2 Chemistry &crystallography Thailand/Cambodia. These rubies occur as tabular prism/ rh ombohedron/pinacoid...Similar co Thai material. Barrel shap es and pyra- Cambodia. Similar to Thailand, Australia and Nigeria. Bar-...Vietnam, Afghanistan, Kenya, Tanzania ā¢ Thailand/Cambodia Blue sapphire ā¢ Sri Lanka, Kashmir (India) ā¢...Australia, China, Colombia, Nigeria, Thailand, Cambodia ā¢ Inert to moderate red a. Heat treated gems |
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