 | 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...peralkaline nepheline syenites on Rouma Island, in the Los Archipelago, in Guinea; associated minerals are aegirine...albite, analcime, arfvedsonite, catapleiite, a eudialyte-group member, microcline, sodalite, sphalerite...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 |  | | 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...albite, analcime, arfvedsonite, catapleiite, a eudialyte-group mineral, microcline, sodalite, sphalerite...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...the serandite typelocality, Rouma Island in the Los Archipelago, Guinea, the rocks are peralkaline nepheline...astrophyllite, eudialyte, catapleiite, leucophanite, and villiaumite for which Rouma Island is also the |  | | Journal (article/letter/editorial) | | MINERALS OF THE WÖHLERITE GROUP FROM THE LOS ARCHIPELAGO, GUINEA Cristian BIAGIONI§ and Stefano MERLINO...samples from the nepheline syenites of the Los Archipelago, Guinea, was studied in order to characterize the...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 |  | | 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 |  | | Book | | 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...Monteregian Hills (see below) remained exposed as islands in the sea; sand beaches can be found on the mountain's...protecting the only remaining primeval forest in the region. THE EARLY SCIENTIFIC INVESTIGATIONS T he earliest |  | | Book | | Mexico Pages 160-161: Elbaite crystals from the island of Elba, Italy Pages 244-245: Whewellite crystals...Rene• Just Haiiy Below: A beautiful crystal of eudialyte. minerals by German physicist Max von Laue in...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... W../ "/ Below: f\ beautiful crystal of eudialyte. minerals by German physicist Max von Laue in...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 |  | | Report (issue) | | and Zr03 if it contains considerable zircon or eudialyte. of calculation, but it is to be deplored; it...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 |  | 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...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)...VHNjo9 = 260. R = 55.3 (540 nm). Magnetic. Kumak region, Southern Ural Mts., Russia, in quartz veins with |
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