 | 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...body and biotite gneiss, and which contains plagioclase, phlogopite, Cr-bearing muscovite, apatite, Be-bearing...serpentinized ultrabasic unit, and slightly (with plagioclase, mica, and quartz) at the contact with the gneiss...the metallic flake. FiGure 1. (a) Inset: map of Bulgaria with the location of the study area in the Rila |  | | Journal (article/letter/editorial) | | assemblages. Quartz – oligoclase augen and quartz – plagioclase – muscovite leucosome are developed throughout...garnet and apatite, zircon, and trace sulfides. Plagioclase–ferrosilite veins are widespread and appear to...green color of muscovite in the deposit. Plagioclase Plagioclase is present as distinct crystals or aggregates...to 3 cm in maximum length. The composition of plagioclase (albite) is variable, in the range An1–10. Carbonates...pegmatite from the Urdini Lakes, Rila Mountains. Annuaire de l’Université de Sofia, Faculté de Géologie |  | | Journal (article/letter/editorial) | | been mined in Afghanistan, Australia, Austria, Bulgaria, China, India, Madagascar, Namibia, Nigeria, Pakistan...post-tectonically, mainly at the contact between muscovite-plagioclase-chlorite boudins and biotite schists. Geochemical...Terezinha (Gavrilenko et al., 2006). 30. Bulgaria, Urdini Lakes, Rila Mountains (Petrusenko et al., 1966)...1966). Includes 0.002 wt.% Rb2O. 31. Bulgaria, Rila (Alexandrov et al., 2001). Average of 10 analyses....Terezinha parental fluids. 5.5. Bulgaria The Rila emerald occurrence in SW Bulgaria is associated with a desilicified |  | 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) | | DYKO6-zh. Photograph: Dan Marshall; (e) emerald in plagioclase, Carnaíba, Brazil, longest crystal: 6 cm. Photograph:...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...Types IIB and IIC Canada (Tsa da Gliza, Taylor 2) Bulgaria (Rila) Urals (Malysheva, etc.) Pakistan (Khaltaro)...dolomite, and minor quartz, calcite, zircon, plagioclase, and chlorite. 2 Minerals 2019, 9, 105 26 |  | | 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...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...zircon xenocrysts from alkali basalts in Ratanakiri Province (Cambodia) suggest that their genesis involved |  | | Journal (issue) | | sapphire to partial lower crustal melting of plagioclase-rich magmatic rocks by the lamprophyre. In this...magmatic and metamorphic origins. Within a single gem province in Australia, variations in color observed for...proposed to be olivine-rich cumulates and/or plagioclase. Geology and Genesis of Metamorphic Corundum...composed of garnet (pyropealmandine) + pargasite ± plagioclase ± corundum ± spinel ± apatite. Metamorphic conditions...increases in the pegmatite vein, and a metasomatic plagioclase-corundum association in which the mass of alumina |  | | Book | | Proportions Brazil, 378 Angles of Faceted Bulgaria, 399 333 Burma, 400 from Recommended Canada...Laet’s issued an work remarks on more the Province and the Laet, illustration Some information...discussed below. The are Cape St. Helena in the Province of 1783 contained time several However, confusion...dominantly of the skeletal crystal of (p. plagioclase, the Helen tourmaline, Beryl pegmatite and...hundreds of meters contain to is well in plagioclase feldspar pale yellow in color. or to the |
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