 | 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) | | of formation: (Type I) magmatic-related and (Type II) metamorphic-related. Type I is characterized by...magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding to xenocrysts...in kimberlite (Democratic Republic of Congo). Type II also has two sub-types; metamorphic deposits sensu...rubies from the recently discovered Didy mine in Madagascar also command high prices [19]. A set of eight...Ambohimandrosoa, Antsirabe area, cm2.1 Ă 1.3 andcm 1.7Ăcm 1 cm Ă 11.7cm) Antsirabe area, Madagascar. Collection: |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, ThĂŠogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin Gaston...dâAntananarivo, Ambohitsaina, BP 906, Antananarivo 101, Madagascar Y. Offant Cerege, Europole MĂŠditerranĂŠen de lâArbois...Ambaranjana Antanimora, Antananarivo 101, Madagascar ces in Madagascar to provide a gemstone geological identification...characterization. Primary corundum deposits in Madagascar are hosted in magmatic (syenite and alkali basalt)...xenoliths contained in the alkali basalt of Soamiakatra have δ18O values ranging between 1.3 and 4.7â° |  | | Journal (article/letter/editorial) | | East African rift (Krzemnicki et al. 1996), in Madagascar (Schwarz et al. 2000; Giuliani et al. 2007a)...Thailand (Sutthirat et al. 2001) or at Soamiakatra, Madagascar (Rakotosamizanany 2003). Rubies are generally...area such as in Cambodia (Pailin), Madagascar (Antanifotsy-Soamiakatra), Australia (Yarrowitch), and Thailand...basalts is found in central Madagascar (Rakotosamizanany 2003): the Soamiakatra deposit in the Antanifotsy...Antanifotsy area. Ruby occurs in garnet-clinopyroxenite and garnet-metagabbro xenoliths hosted by Cenozoic alkali |  | | Book | | and kimberlite (IB) hosts. Metamorphic rocks (Type II) are subdivided into Metamorphic, sensu stricto,...Tanzania; Andilamena/Zahmena and Ampanihy/Toliara, Madagascar. Marble-ruby types included various deposits...sapphire deposits included Andilamena and Andrebabe, Madagascar; various Mogo Gem Tract sites, Myanmar; Elahera...Namehaca, Mozambique and Ampanihy and Zahmena, Madagascar. In contrast, Appaluttoq ruby, Greenland, 4...of formation: (Type I) magmatic-related and (Type II) metamorphic-related. Type I is characterized by |  | Garnier, V., Ohnenstetter, D., Giuliani, G., Fallick, A. E., Phan Trong, T., HoĂ ng Quang, V., Pham Van, L., Schwarz, D. (2005) Basalt petrology, zircon ages and sapphire genesis from Dak Nong, southern Vietnam. Mineralogical Magazine, 69 (1) 21-38 doi:10.1180/0026461056910233 | Journal (article/letter/editorial) | | erosional deposits in southeast Asia, Australia and Madagascar. The basalt ÂŽelds yielding corundums are widespread...deposits of Dak Nong. The Dak Nong sapphire-mining district lies in the Dak Lak Province near the Cambodian...rocks sampled from basaltic ÂŻows from the mining district of Dak Nong. Chemical analyses for the samples...suite Tholeiitic basalt suite Subgroup I Subgroup II Sample V75b V75f V75g V75h V75e V74a V74c...On the spider diagram (Fig. 5c,d), the sub-group II is enriched in REE compared to the sub-group I which |  | 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) | | the Pan-African orogeny are present in southern Madagascar, East Africa, South India and Sri Lanka; those...sapphires occur in Australia, northern and central Madagascar, Nigeria, Cameroon, French Massif Central and...diaspore; 420 to 500 ⌠C (appearance of biotite) for zone II; 500 ⌠C to 540â580 ⌠C (disappearance of chloritoid)...metamorphism; (ii) syn-metamorphism depletion in O related to hydration subduction and metamorphism; (ii) syn-metamorphism...of low-Fe metamorphic sapphires (e.g., Ilakaka/Madagascar and Ratnapura Balangoda/Sri Lanka), subparallel |  | Keulen, Nynke, Thomsen, Tonny B., Schumacher, John C., Poulsen, Majken D., Kalvig, Per, Vennemann, Torsten, Salimi, Rita (2020) Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the FiskenĂŚsset complex, Greenland. Lithos, 366. 105536pp. doi:10.1016/j.lithos.2020.105536 | Journal (article/letter/editorial) | | that consist of either nearly monomineralic clinopyroxenite with minor plagioclase and titanite, or dunite...Tanzania), the placer deposit of Andilamena (Madagascar), and to a lesser degree the metamorphic basaltic...ultramafic deposits like Winza, Tanzania and Ilalaka, Madagascar. Pr Again, this may reflect a similar history...â worldwide only rubies from Madagascar (Andilamena, Ilakaka, Soamiakatra, Iankaroka, Ambatomena) have...similar reported δ18 O ratios. Those deposits in Madagascar are Pr partially related to rocks with a similar |  | 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) | | blue sapphires from non-basaltic ďŹelds (Ilakaka, Madagascar; Ratnapura, Sri Lanka; Mogok, Myanmar) to those...Yui et al. (2006) suggested that a garnet clinopyroxenite may have been the common primary source for...isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium...alkali feldspar xenocrysts in basaltic terranes. II. Geochemical and petrogenetic considerations. Canadian...Rakotosamizanany, S., 2003. Les gisements de rubis de Soamiakatra: caracteres mineralogiques â gemmologiques â |  | | Journal (issue) | | had to go on. GEMS & GEMOLOGY WINTER 2019 Madagascar are from metamorphic deposits, but the deposits...basaltsâtwo very different deposits, yet both from Madagascar. As stated earlier, when geographic origin determination...ring, courtesy of Ronald Ringsrud; a 7.04 ct Madagascar sapphire, courtesy of Mayer & Watt; and an exceptional...such as in Sri Lanka (Ratnapura, Elahera) and Madagascar (Ilakaka), produce the highest-quality sapphires...(Type I) and (2) tectonic-metamorphic-related (Type II). Several subtypes are defined and especially Type |  | | Book | | (Itabira), Colombia (Coscuez), Ethiopia (Shakisso), Madagascar (Mananjary), Russia (Ural mountains), Zambia...I: muscovite, tourmaline, albite, and quartz; Zone II: K-feldspar (microcline), quartz, and albite; Zone...medium-grained albite and quartz (Figure 3aâc); Zone II hosting homogeneous medium-grained K-feldspar (microcline)...between Zones II and III (Figure 3e,f), and spodumene and/or cassiterite in Zones I and II are common ([6]...microcline and quartz crystals collected from Zone II. Muscovite grains gathered from Zone I were suitable |  | | Journal (article/letter/editorial) | | sediments but rarely in volcanic rocks e.g., Cobalt district of Ontario, Canada, Wittichen, Richelsdorf, Bieber...Jachymov, Czech Republic, Black Hawk District, USA, Batopilas District, Mexico (Fig. 04.01). These vein-type...gemological products (Fig. 04.10). In the Marlborough district of Queensland, Australia, it occurs within the...Complexes, USA, and the Russian NoriÄşskTalnakh District (Cabri and Traill, 1966). 4a A: As an example...rift-related volcanic host rocks the NoriÄşsk-Talnakh District in Russia can also be mentioned. These PGEâ CuâNi | | | Journal (article/letter/editorial) | | sediments but rarely in volcanic rocks e.g., Cobalt district of Ontario, Canada, Wittichen, Richelsdorf, Bieber...Jachymov, Czech Republic, Black Hawk District, USA, Batopilas District, Mexico (Fig. 04.01). These vein-type...gemological products (Fig. 04.10). In the Marlborough district of Queensland, Australia, it occurs within the...Complexes, USA, and the Russian NoriÄşskTalnakh District (Cabri and Traill, 1966). 4a A: As an example...rift-related volcanic host rocks the NoriÄşsk-Talnakh District in Russia can also be mentioned. These PGEâ CuâNi |
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