 | 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...microcline, sodalite, sphalerite, steacyite and villiaumite. Roumaite is monoclinic, space group Cc, with...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...steacyite, villiaumite. Distribution: From Rouma Island, Los Archipelago, Guinea. Name: For Rouma Island, a central...central island in the lagoon of the Los Archipelago, Guinea, where the first specimens were collected...Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to |  | | 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...eudialyte, catapleiite, leucophanite, and villiaumite for which Rouma Island is also the type locality (Fontan |  | | 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...fluorite, mosandrite, sérandite, sphalerite, and villiaumite; wöhlerite and hiortdahlite I are associated...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 |  | | 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....lamprophyllite, lomonosovite, shafranovskite, villiaumite, and natrophosphate in the highly mineralized |  | | 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...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...Moreau et al. 1996) from the Rouma Island (Los Islands, Republic of Guinea). Associated minerals in the |  | | 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...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...Panorama of iron mines near Rio Marina on the island of Elba, Italy. Above: Exposed pegmatite vein on | | | Book | | Mexico Pages 160-161: Elbaite crystals from the island of Elba, Italy Pages 244-245: Whewellite crystals...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... Top: Panorama of iron mines near Rio Marina on the island of Elba, Italy. Above: Exposed pegmatite vein on |  | | Journal (volume) | | look. What do you see?” There was something in the region where Jim was pointing; but what? “You should get...life-long love affair with halides. The mineral villiaumite, NaF, seems to have had a particular fascination...obscure pegmatite on Rouma Island in the Los Archipelago off the coast of Guinea, and many other localities... Sperrylite from the Talnakh orefield, Norilsk region, eastern Siberia, Russia. Mineralogical Record...extensively across north east England from the Farne Islands in the north, through Northumberland and the Roman |  | 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 |
|
Rouma Island, Los Archipelago, Conakry Region, Guinea