 | Dekov, V. M., Arnaudov, V., Munnik, F., Boycheva, T. B., Fiore, S. (2009) Native aluminum: Does it exist?. American Mineralogist, 94 (8) 1283-1286 doi:10.2138/am.2009.3236 | Journal (article/letter/editorial) | | of Sofia, 1000 Sofia, Bulgaria 2 Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria...emerald in a pegmatite vein in the Rila Mountain (Bulgaria). This contribution addresses the composition...unit, and slightly (with plagioclase, mica, and quartz) at the contact with the gneiss (Petrussenko et...the metallic flake. FiGure 1. (a) Inset: map of Bulgaria with the location of the study area in the Rila...= alluvial deposits; 16 = Al0 occurrence; 17 = lakes. resuLts The metallic flake is quite large (~2 |  | | Journal (article/letter/editorial) | | 1529-1541 (2006) THE EMERALD- AND SPODUMENE-BEARING QUARTZ VEINS OF THE RIST EMERALD MINE, HIDDENITE, NORTH...Beryl and chromian spodumene occur entirely within quartz veins and in open cavities that occupy brittle...in the four assemblages are calcite, amethystine quartz, spodumene and emerald. The early stage of vein...characterized by the crystallization of massive quartz and followed largely by the precipitation of Ca–Fe–Mg...cogenetic high- and low-X(CO2) fluid inclusions in quartz indicates that an aqueous carbonic fluid reached |  | 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) | | granitic pluton. The emerald crystals occur where quartz veins cut mica-rich layers in a shallowly dipping...sulfides have been observed to occur within the quartz veins. A zone of sparse, disseminated sulfides...length occur in tourmaline zones and, rarely, in the quartz veins. Some of the smaller crystals, and sections...The ␦18O values for coexisting quartz and tourmaline from the quartz veins yield temperatures of formation...d’émeraude se sont développés où des veines de quartz recoupent des niveaux micacés de l’unité schisteuse |  | | Journal (article/letter/editorial) | | been mined in Afghanistan, Australia, Austria, Bulgaria, China, India, Madagascar, Namibia, Nigeria, Pakistan...emeralds are in pegmatite dikes with fluorite, beryl, quartz, topaz, arsenopyrite, and cassiterite. The crystals...the emeralds occur in quartz and pegmatite veins and are associated with quartz, feldspar, biotite, and...sapphire, topaz, fluorite, margarite, muscovite, and quartz in a phlogopite “blackwall” zone, interpreted as...metamorphic conditions) between pre-existing quartz–muscovite or quartz–topaz greisens and ultramafic bodies (Grundmann |  | Marshall, D. D., Groat, L. A., Falck, H., Giuliani, G., Neufeld, H. (2004) THE LENED EMERALD PROSPECT, NORTHWEST TERRITORIES, CANADA: INSIGHTS FROM FLUID INCLUSIONS AND STABLE ISOTOPES, WITH IMPLICATONS FOR NORTHERN CORDILLERAN EMERALD. The Canadian Mineralogist, 42 (5) 1523-1539 doi:10.2113/gscanmin.42.5.1523 | Journal (article/letter/editorial) | | garnet–diopside skarn. The emerald is generally found in quartz–carbonate veins with mm-scale alteration haloes...of the Devonian Earn Group. Skarn and subsequent quartz–carbonate veins are the result of contact metamorphism...brine limited to subsequent crystallization of quartz. The CO2-bearing fluid is dominantly a dilute aqueous...cristaux se présentent généralement dans des veines à quartz + carbonate entourées d’un liseré d’altération...dévoniens du Groupe de Earn. Le skarn et les veines à quartz + carbonate sont le résultat du métamorphisme de |  | 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) | | worldwide photographs: (a) Emerald crystals on quartz and adularia, Panjshir Valley, Afghanistan, 6.6...Louis-Dominique Bayle, le Règne Minéral; (c) Emerald in quartz, Kagem mine, Zambia, longest crystal: 7.9 × 1.2...Louis-Dominique Bayle, le Règne Minéral; (d) emerald in quartz vein and minor potassic feldspar, Dyakou, China...younger volcano-sedimentary series or ophiolites in Bulgaria, Canada, China, India, Pakistan, Russia, and Spain...42. Urals (Malyshevo). Ukraine: 43. Wolodarsk. Bulgaria: 44. Rila. Austria: 45. Habachtal. Norway: 46 |  | | Book | | Proportions Brazil, 378 Angles of Faceted Bulgaria, 399 333 Burma, 400 from Recommended Canada... But if antiquities, so an and scriptions quartz] “it of a to seems only two that be For...pearl, zircon, coral, soberyl, garnet, carnelian, quartz, and 10 as The shown gems on a emerald...Qift as as other mineral, one Ball. massive quartz vari- called limoniatis 4 Following his discussion...to smooth a the to case that it would be quartz that This that to more engraved noted the |  | | Book | | Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights into Their Origin...Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry...Xydous On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades...pegmatite situated in the Borborema Pegmatitic Province (BPP) from Rio Grande do Norte in Northeast Brazil...alluvial sapphires from the Orosmayo region (Jujuy Province, NW Argentina) and importantly shows that there |  | | Journal (issue) | | characterized by the intrusion of pegmatites or quartz veins in M-UMR accompanied by huge hydrothermal...magmatic and metamorphic origins. Within a single gem province in Australia, variations in color observed for...events. The mechanism of desilication, a loss of quartz, involves diffusion of Si from a pegmatite vein...at the same time and is underlain by a zone of quartz dissolution. World-class sapphire deposits in desilicated...basalt deposits in Madagascar. In Antsiranana Province, the paleoplacer is composed of a carbonate-karst |
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