 | Biagioni, C., Bonaccorsi, E., Merlino, S., Parodi, G. C., Perchiazzi, N., Chevrier, V., Bersani, D. (2010) Roumaite, (Ca,Na,◻)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: A new mineral species related to dovyrenite. The Canadian Mineralogist, 48 (1) 17-28 doi:10.3749/canmin.48.1.17 | Journal (article/letter/editorial) | | Na)4(Nb,Ti)[Si2O7]2(OH)F3, FROM ROUMA ISLAND, LOS ARCHIPELAGO, GUINEA: A NEW MINERAL SPECIES RELATED TO...of peralkaline nepheline syenites on Rouma Island, in the Los Archipelago, in Guinea; associated minerals...structure, OD character, agpaitic syenite, Los Archipelago, Guinea. Sommaire La roumaïte, (Ca,Na‚□)3(Ca,REE...hyperalcalines de l'île de Rouma, complexe magmatique de l’archipel de Los, en Guinée. Lui sont associés...archipel de Los, Guinée. Introduction The Los Archipelago is located 5 km offshore of Conakry, capital |  | | Report (issue) | | 60(2)° Z = 4 X-ray Powder Pattern: Rouma Island, Los Archipelago, Guinea. 3.057 (100), 2.021 (67.7), 1.680...7.83 10.51 6.46 2.72 96.61 (1) Rouma Island, Los Archipelago, Guinea; average of 6 electron microprobe...product of hydrothermal activity in cavities in nepheline syenite associated with a peralkaline complex...Distribution: From Rouma Island, Los Archipelago, Guinea. Name: For Rouma Island, a central island in the lagoon...lagoon of the Los Archipelago, Guinea, where the first specimens were collected. Distribution of REE insufficiently |  | | Journal (article/letter/editorial) | | described as a new species from Rouma Island, Los Archipelago, Guinea (Lacroix 1931). It was named in...supplied Lacroix with suites of samples from the Los peralkaline complex (Fontan and Martin 2017). Lacroix...cm wide, from the type locality, Rouma Island, Los Archipelago, Guinea. Donald Doell specimen, Peter Tarassoff...acterized by containing feldspathoids such as nepheline and sodalite, alkali amphiboles such as arfvedsonite...typelocality, Rouma Island in the Los Archipelago, Guinea, the rocks are peralkaline nepheline syenites of |  | | Journal (article/letter/editorial) | | MINERALS OF THE WÖHLERITE GROUP FROM THE LOS ARCHIPELAGO, GUINEA Cristian BIAGIONI§ and Stefano MERLINO...suite of samples from the nepheline syenites of the Los Archipelago, Guinea, was studied in order to characterize...syenite, Los Archipelago, Guinea Introduction The Los Archipelago, located 5 km offshore of Conakry, capital...capital of Guinea, is mainly formed by nepheline syenites emplaced in the West African continental margin...Kola Peninsula, Russia. The mineralogy of the Los Archipelago was studied by Lacroix (Lacroix 1911), who |  | Zubkova, N. V., Chukanov, N. V., Pekov, I. V., Schäfer, C., Yapaskurt, V. O., Pushcharovsky, D. Yu. (2015) Lanthanum-rich fluorbritholite-(Ce) from young alkaline volcanic rock of Eifel (Germany) and its crystal structure. Cation ordering in britholites. Doklady Earth Sciences, 464 (1) 936-939 doi:10.1134/s1028334x15090147 | Journal (article/letter/editorial) | | variety of fluorbritholite(Ce) from Rouma Island (Los archipelago, Guinea) were reported in 2001 [5]. Here...Dellen pumice mine near Mendig (Eifel volcanic region, RheinlandPfalz, Germany) [6]. This sample attracted...Fluorbritholite(Ce) (Narich) Rouma Island, Los archipelago, Guinea Fluorcalciobritholite Khibiny, Kola...Narich variety of fluorbritholite(Ce) from Rouma Island [5] violates this regularity and shows equivalent...volcanic complex as a rock comagmatic to nosean–nepheline syenite (in contrast to massive sanidinite which |  | | Journal (article/letter/editorial) | | 550–600 cm–1 region and phosphate antisymmetric stretching modes in the 900–1200 cm–1 region. Also obvious...The afmite spectrum has multiple bands in the OH region, both sharp and broad. The sharp bands more likely...bonding with isolated H2O groups in the interlayer region. Afmite is closely related structurally to the...Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, U.S.A....Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to |  | | Journal (article/letter/editorial) | | 07P0.75)Σ5.82O24(OH0.53F1.47)Σ2.00 (from Los Islands, Guinea). The crystal-chemical formulae were calculated...unique and very broad band in the OH-stretching region at 3437 cm–1, which is consistent with the ordering...mineral phases, and it is typically found in nepheline syenites and in contact metasomatic rocks related...previously refined samples. The second (hereafter called LOS) is similar in composition to one of the P63 samples...the ejectum (Della Ventura et al. 1999). Crystal LOS was found in specimen N. 130.61 of the mineralogical |  | | Journal (article/letter/editorial) | | sites. Keywords: mosandrite, rinkite group, Låven Island, Norway. Sommaire La mosandrite, Ti(,Ca,Na)3(Ca...Na–Ca–REE–Ti–Nb silicates, originally described from the nepheline syenites in Langesundsfjord (Norway), Ilímaussaq...of Oslo, also come from the nepheline syenite pegmatites on Låven Island, in Langesundsfjord district...translucent crystals, in association with aegirine, nepheline, sodalite, annite, catapleiite, astrophyllite...2009), and in a new mineral from Rouma island, Los Archipelago, Guinea, (Ca,Na,REE,)7(Nb,Ti)[Si2O7]2OF3 |  | | Book | | Mexico Pages 160-161: Elbaite crystals from the island of Elba, Italy Pages 244-245: Whewellite crystals...are gabbros, monzonites, granites, syenite and nepheline syenites. Common effusive rocks, variously associated...the Passo del Rombo in the Trentino-Alto Adige region of Italy, or the splendid crystals of azure-blue...Sicily There are large deposits of sulfur on the island of Sicily, most of all in the provinces of Agrigento...1500, the area of Baveno in the northern Italian region of Piedmont, was famous throughout Europe for the | | | Book | | Mexico Pages 160-161: Elbaite crystals from the island of Elba, Italy Pages 244-245: Whewellite crystals...are gabbros, monzonites, granites, syenite and nepheline syenites. Common effusive rocks, variously associated...the Passo del Rombo in the Trentino-Alto Adige region of Italy, or the splendid crystals of azure-blue...Sicily There are large deposits of sulfur on the island of Sicily, most of all in the provinces of Agrigento...1500, the area of Baveno in the northern Italian region of Piedmont, was famous throughout Europe for the |  | | Book | | of the Poudrette quarry Miarolitic cavities in nepheline syenite Sodalite syenite Igneous breccia Pegmatites...understand the petrogenesis of the igneous complex. In nepheline syenite and sodalite syenite pegmatites, just...mineralogical fame and significance, as in the case of the island of Laven in the Langesundfjord District of Norway...named Monteregie is now the current name of the region. he name Mont Saint-Hilaire is used interchangeably...what is now the Richelieu River and Lake Champlain region, Samuel de Champlain first named the mountain Mont |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Tuscon, Arizona. Barry Yampol: Oyster Bay, Long Island, New York. Victor Yount: Warrenton, Virginia. Josef...Quartz Opal, some yellow varieties of sphalerite Nepheline Tale, brucite Sillimanite such terms as The...Creek, NT. In New Zealand, Hauraki Peninsula, North Island, and placer deposits in Nelson, Westland, Otago...Emperor mine, Vatukuola, Fiji. Mt. Kare, Papua New Guinea. In South America, Antioquia and Cauca, Colombia;...nm); weakly anisotropic. Bolshoi Anyui R.., Kolyma region, Russia, in gold-bearing alluvium. sm MZ 11(4):88(1989) |  | | Report (issue) | | constitue:p.ts, barium along the Rocky Mountain region than in the but only those essential to a proper...correction applied to be advisable in investigating a region, locality, or to the ferrous oxide in the most...determination of manpresence or absence in the region or in the various 1nagmas ~s of most iinportance...liability to error in alumina involved in the acetate region in its n.1ain features and a sufficient knowledge...Doelter's analyses of the· augitites of the Cape Verde Islands. These analyses show 16 to 24 per cent of Al20 |
|
