 | | Journal (article/letter/editorial) | | Pyrochlore from weathered carbonatite at Lueshe, Zaire F. WALl.,C. T. WILLIAMS,A. R. WOOIJ.EY Department...pyrochlore in the laterite above carbonatite at Lueshe, NE Zaire, has been made in order to determine...variations. Pyrochlore in fresh carbonatite at Lueshe is close to an ideal formula of (Ca,Na)2Nb206(OH...worldwide. As a result weathered pyrochlore at Lueshe has a large apparent A cation deficiency with A...remain stable. Abundant kalipyrochlore is unique to Lueshe and is thought to be related to the abundance of |  | | Journal (article/letter/editorial) | | IN WEATHERED PYROCHLORE-GROUP MINERALS FROM THE LUESHE AND ARAXÁ (BARREIRO) CARBONATITES BY 57Fe MÖSSBAUER...Nb ore deposits in laterite: Lueshe in the Democratic Republic of Congo, and Araxá in Brazil. In contrast...oxidation state in the kalipyrochlore sample from Lueshe. Spectra of both samples are consistent with the...coordinated by 6 O2– is observed in both cases. In the Lueshe sample, it is also coordinated by 5 O2– and 1 OH–...gisements latéritiques à Nb, celui de Lueshe en République Démocratique du Congo et celui d’Araxá au Brésil, l’idée |  | | Report (issue) | | [0.05] . Total [99.86] [99.89] 100.74 (1) Lueshe, Congo; original total given as 100.192%, corrected...anatase) 1.3%, calcite 0.9%, kaolinite 0.55%, goethite 0.3%, H2O+130o C. (2) Do.; original total given... anatase) 1.1%, calcite 1.6%, kaolinite 0.4%, goethite 0.2%, H2O+130o C. (3) Do.; by electron microprobe...Distribution: In the Lueshe carbonatite, 150 km north of Goma, Kivu Province, Congo (Zaire). Name: For |  | | Journal (article/letter/editorial) | | grained and intimately intergrown with hematite, goethite and minerals of the crandallite group. The different...Similar supergene occurrences occur at Lueshe and Bingo (D.R. Congo), Mabounié (Gabon), Sukulu (Uganda)...date, all major operating and former (Oka, Fen, Lueshe) Nb mines have been developed in primary carbonatites...only operating Nb mine in under-saturated peralkaline syenites is the Karnasurt mine (Kremenetsky et al...units presents in carbonatites e.g. the Loolekop mine at Phalaborwa (Fig. 250 of Woolley, 2001), Catalão-I |  | | Journal (article/letter/editorial) | | common in the residualsoils of the Lueshe carbonatitedeposit,Kivu, Zaire.The niobiummineralizationis...refractive indices of kalipyrochlores and pyrochlores (Lueshe dePosit) Pyrochlore species Analyzed Na-Ca pyrochlores...partially weatheredpyrochloreand kalipyrochlorefrom Lueshe Elenents analyzed PartlaIIy \reathered green...Goyazite Ilnenlte Rutile, Anatase Cal-clte Kaolinlte Goethite arouncl 130oC. 7.57" L.97" l.I% L.61( 0,4%...someniobium-bearing als of the Lueschecarbonatitedeposit(Kivu, Rep. of Congo). EuratomRep.2l10e. Manuscriptreceiued,October5 |  | | Catalog/List | | Italy. massive, green 2 variety ADAMITE: Ojuela Mine, Mapimi, Durango, Mexico. crystals ADAMITE,variety...Index, Washington, USA. crystals ALBITE: Jeffrey Mine, Asbestos, Quobcc, Canada. crystals ALBITE: St....good crystal sections AS ,'\BOVE ALGOOONITE:Calumot Mine, Michigan, USA. massive ALL'\NITE: . Quadeville...in feldspar /\LLEGHi'.NYITE:/\llcgheny County, North Carolina, USA, crudG crystals to massive ALLOPHANE:Juanita...1-:incrva .i'l Mine, Cavo-ln-Rock, Illinois, USA. good crystals ALT/1ITE: Hilltop Mine, Organ Mountain |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, Andrés B. (2012) Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: The Tchivira case, Angola. Lithos, 152. 187-201 doi:10.1016/j.lithos.2012.06.024 | Journal (article/letter/editorial) | | pyrochlore crystals by goethite, as well as the occurrence of Nb-rich goethite and Fe–Mn oxyhydroxides...set of faults oriented NE–SW that cut the Angola–Congo craton (Issa Filho et al., 1991). Different types...by a fine-grained mixture of calcite (Cal2) and goethite (Gth). d) Ankerite (Ank) replaced by quartz (Qtz)...by brownish mixtures of calcite and fine-grained goethite. 5.4. Fluoritized and silicified units Fluoritized...of sequences of radial aggregates of goethite and Nb-rich goethite, hollandite [BaMn2+Mn4+7O16], 16], coronadite |  | Torró, L., Villanova, C., Castillo, M., Campeny, M., Gonçalves, A. O., Melgarejo, J. C. (2012) Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Mineralogical Magazine, 76 (2) 393-409 doi:10.1180/minmag.2012.076.2.08 | Journal (article/letter/editorial) | | processes have produced late-stage carbonates, goethite, hollandite and rare earth element (REE) minerals...supergene minerals including botryoidal aggregates of goethite or hollandite (Fig. 5f). The contact between these...than 1 mm on edge, which are typically altered to goethite. Chalcopyrite occurs as scattered anhedral grains...are associated with supergene minerals such as goethite or hollandite (Fig. 7ad). Although hollandite-type...pyrochlore (Pcl). Supergene processes have produced goethite (Gth) and cerite-(Ce). (b) Mineral associations |  | | Journal (article/letter/editorial) | | the Buru carbonatite centre is characterized by goethite, hematite, psilomelane, baryte, fluorite with...lateritized tuff with irregular veins of hematite and goethite and rare uorite. Below the laterite is a ferrocarbonatite...chi om et ri c psi l om el ane [Ba(H2O)2MnO10 ], goethite, hematite, baryte and uorite (Table 3). One...(BRL-1) towards 6 m (BRL-3) and consists mainly of goethite, hematite, psilomelane, baryte, uorite and monazite...carbonatites elsewhere in Africa (e.g. Lueshe, Democratic Republic of the Congo), the Buru carbonatite centre |  | Chakhmouradian, Anton R., Reguir, Ekaterina P., Kressall, Ryan D., Crozier, Jeremy, Pisiak, Laura K., Sidhu, Ravinder, Yang, Panseok (2015) Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy, geochemistry and petrogenesis. Ore Geology Reviews, 64. 642-666 doi:10.1016/j.oregeorev.2014.04.020 | Journal (article/letter/editorial) | | lesser extent, amphibole. When the passive margin of North America became the zone of plate convergence in...covering the Precambrian basement rocks of the North American craton (Price, 1994 and references therein)...Neoproterozoic to Jurassic on the passive margin of the North American protocontinent and in the adjacent ocean...20% Nb2O5 cutoff Foreland belt (rifted margin of North America) ~370 Ma Dolomite carbonatites (calcite...Disputed between Société Lueshe, Rutshuru Dist., North Kivu, Democratic Minière du Kivu (Somikivu) and Krall |  | | Journal (article/letter/editorial) | | carbonatites at Argor, Carillon Dam, Chilwa Island, Fen, Lueshe, Oka, Mbeya, Meech Lake and Verity. Primary features...e veinlets and low A-ion totals (Carillon Dam, Lueshe, Myeba). K EY WORDS : zoned crystals, carbonatites...to Ce4+ in some pyrochlore from laterite (e.g. Lueshe and Mbeya of this paper; see below) it is not possible...and Ewing, 1995; Wall et al., 1996). Hematite, goethite, uraninite, fergusonite, columbite and fersmite...pyrochlore pyrochlore,uranpyrochlore Mineral Lueshe, Dem. Rep. of Congo San Vicente, Cape Verde Is. Kovdor, |  | | Journal (article/letter/editorial) | | border between Zambia and the Democratic Republic of Congo (DRC), is the largest sediment-hosted stratiform...Katanga Supergroup in the Democratic Republic of Congo, compiled after Cailteux et al. (2005) and Batumike... Three such phases were identified at the Nkana mine in Zambia (Brems et al. 2009). They are characterized...the Lower Orebody and Upper Orebody at the Nchanga mine in Zambia (McGowan et al. 2003). The Cu–Co mineralization...in HA21, chalcocite is partly replaced by goethite. Goethite in these samples is always regarded as a |  | | Book (edition) | | localities as inclusions in the limestone”’ (italics mine). Actually, the first published description of...‘‘fine-grained but crystalline,” (5) that they were 1] thank Dr. G. R. Udas for bringing this historic description...carbonatite dikes cutting the kimberlite of the Premier mine (p. 542) he classed as magmatic, but 1 Bowen admitted...G. B. Du Bois (1956, 1959), B. C. King (1949). Congo (Belgian): A. Meyer and P. de Bethune (1958, 1960)...) around a “core” of alkalic silicate rock: Lueshe, Congo, and Chishanya, Southern Rhodesia. In some cases |  | | Catalog/List | | Ferritungsti e, lxl". £1. 50. .P1I.TITE. Carrock Mine, Caldbeck, Cumberland. Pale sea-green and creamy...assoclatlon. 32x22x12' £11. --hURIClbL-:;ITE. Char..Kounhi Mine, Iran. Light turquoise. blue attractive bladed crystal...~+ ~ attached. 3-~x2". £4.50. ChLCITE. Tynebottom Mine, Garrigill, Cumberland. Translucent, v/ell formed...It" in size. 2tx2"::dt", £2.5"0. ~LCITE. Botallack Mine, st. Just~ Cornwall. Unusual, creamy coloured, modified...on Gossan. lxt". £1.25. CHnLCOClTE. Cooks Kit hen Mine, "::amborne, Cornwall. Choice, platy hexagonaJ. |  | | Journal (article/letter/editorial) | | geographically separated areas, comprising the Shaba and Kivu provinces west of the Central African Rift and...In the west, the Kibara belt is limited by the Congo (Zaire) craton (although the border area is not...occurrences are known from Greenland, Scandinavia, India, Congo and Australia. Towards the later middle Proterozoic...of collision belts are the Grenvillean belts of North America and western South America, the Albany-Fraser...1986; Pinna et al., 1993:950-800 Ma). Towards the North, however, Mozambiquian collision is younging (in |  | | Catalog/List | | 7. APATITE variety FRAN~JLITE. Fowey Consols Mine, Tywardreat~. Corny/all. A r i<.:h Cc:'ust of intergrown...the c£n~u) 2xlt". £27. AZURITE. Duke of Cornwall Mine, Kadina, S. Australia. Sele~t. pure, radiated nodules...matrix. 2xlixl-}". £7. BOF. ITE. South .;aradon Mine, st. '::leer, Cornwall. A pure, purply irridescent...Chalcopyrite. 2txlt". £1.65. BREli STERITE. 'Ihitesmith Mine, Str:mtian, Argyll. Choice, sharp, creamy coloured...app~oximately ~" in size. £7.75. CALCITE. Stank Mine, Furness, Lan~s. An intergrown group of large, sharp |  | Giovannini, Arthur L., Bastos Neto, Artur C., Porto, Claudio G., Pereira, Vitor P., Takehara, Lucy, Barbanson, Luc, Bastos, Pedro H.S. (2017) Mineralogy and geochemistry of laterites from the Morro dos Seis Lagos Nb (Ti, REE) deposit (Amazonas, Brazil) Ore Geology Reviews, 88. 461-480 doi:10.1016/j.oregeorev.2017.05.008 | Journal (article/letter/editorial) | | laterite. All the laterites are composed mainly of goethite (predominant in the lower and upper varieties)...formed from goethite dehydroxylation). The upper laterites were reworked, resulting in goethite formation...(last pyrochore before final breakdown), Nb-rich goethite and minor cerianite. The paragenesis results of...deposit is located within the Balaio Indigenous Territory, within the Pico da Neblina National Park, and...program using the Holland and Redfern method, 1995, goethite was refined in the orthorhombic system using the |  | | Book | | g. ardennite, ottrelite), personalities (e.g. goethite, aher the German mine ralogist and writer Johan...Buttgenbach H. (1 947) Les Mineraux de Belgique et du Congo Beige. 573 p. Paris: Ed. Dunod. Cesbron, F. (1985)...the government of the Democratic Republic of the Congo introduced a new admin istrative subdivision for...Haut-Loma mi Province. What formerly was called the Bas-Congo Province is known today by the name of Central Kongo...abbreviated (B = Belgium; D.R. Congo = Democratic Republic of the Congo; F = France). 4. The biographical |  | Prokopyev, Ilya R., Doroshkevich, Anna G., Sergeev, Sergey A., Ernst, Richard E., Ponomarev, Jean D., Redina, Anna A., Chebotarev, Dmitry A., Nikolenko, Anna M., Dultsev, Vladislav F., Moroz, Tatyana N., Minakov, Alexey V. (2019) Petrography, mineralogy and SIMS U-Pb geochronology of 1.9–1.8 Ga carbonatites and associated alkaline rocks of the Central-Aldan magnesiocarbonatite province (South Yakutia, Russia) Mineralogy and Petrology, 113 (3) 329-352 doi:10.1007/s00710-019-00661-3 | Journal (article/letter/editorial) | | zone extends approximately 400 km in length from north to south (Fig. 1). It is confined to the Hardagasky...gneisses host the Muostalaah occurrence. Most of the territory is covered by Quaternary sediments: pebble, sand...the Timpton river (Fig. 4), approximately 30 km north-east of Neryungri town in Yakutia. The ore-body...carbonatite intrusion is elongated from south to north-west and is in contact with the metamorphic rocks...and hydroxides of Fe and Mn such as haematite, goethite, etc. (Table 1). The weathering crust of the Birikeen |  | | Report (issue) | | ~port- - - - -- - - - - - - - - Graph showing world mine production of niobium concentrate, for selected...larger, than was established when the decision to mine was made. Experts with a sound knowledge of a deposit...1970 1975 1980 1985 1990 • Year 2. World mine production of niobium concentrate, for selected...production is dominated by three producers that mine pyrochlore; the Araxa open pit in Minas Gerais,...state, also in Brazil, and the Niobec underground mine in Quebec Province, Canada. The Brazilian position |  | Deditius, Artur P., Smith, Frances N. (Skomurski), Utsunomiya, Satoshi, Ewing, Rodney C. (2015) Role of vein-phases in nanoscale sequestration of U, Nb, Ti, and Pb during the alteration of pyrochlore. Geochimica et Cosmochimica Acta, 150. 226-252 doi:10.1016/j.gca.2014.11.024 | Journal (article/letter/editorial) | | secondary phases from tailings of Silver Crater Mine in Bancroft, Ontario (Canada) have been studied...collected from a tailings pile at Silver Crater Mine in Bancroft, Ontario (Canada), where a carbonatite...1993). The U-Pb dating of uraninite from the Faraday Mine in the Bancroft indicated ages of 1059-1020 Ma (Little...alteration of metamict betafite from Silver Crater Mine was studied by Lumpkin and Ewing (1996), which identified...Previous studies on betafite from Silver Crater Mine indicate that the darker areas formed as a result |  | | Journal (article/letter/editorial) | | continues the series of 21 published triennially by Dr. L. J. Spencer between 1897 and 1958. Such lists...MHHepa~orM~ecKoro O6~eCTBa; the eorttinuation of Dr. Speneer's series seems desirable since it differs...isomorphous series (e.g. alumogoethite for an aluminian goethite). There remain 142 acceptable names, less than...URSS), vol. 113, p. 1130 (A~oM0reTnT). Aluminian goethite, occurring in bauxites. An unnecessary name. A...fumarole on Cerro Pululus, north-west Argentina, appear to be F%As20 n. Named after Dr. V. Angelelli, Director |  | | Catalog/List | | ----·-·- ---- ·- -- 1129 ALMANDINE Brastad iron Mine near Arendal ,Norway 87 ■ BERYL Evje area . South... . --- .. ------- - -· 1009 ANDALUSITE Ultevis,North Sweden 1099 CATAPLEIITE Bratthagcn, near Larvik...---·-··----·------ ·- - ---27 ANTHOPHYLLITE Kaveltorp Mine Sweden 1008 CHRYSOBERYL Kolsva. Vastmanland Sweden...--~----· ·---·-------- -- -62 COBAL TITE Bolidcn Mine, North Sweden 1003 ARSENIOPLEITE Sjogruvan,Ridd arhyllan...2x3 £25 Ampibole 1140 ERYTHRITE Sl-a1tterud Cobalt Mine. Vikersund Norway 970 MAGNESIOHASTINGSITE Langban |  | | Catalog/List | | massive with minor Celsian and Bementite from Benallt Mine, Lleyn, Wales, (Recently tested by XRD) lxl £4 lx2...£15 £6 88 ADAMITE Ojuela Mine, Mapimi, Mexico 1036 ALSTONITE Fallowfield Mine, Northumberland Colourless...x2 £ 1.50 2x2 £3 Al SO/4 767 ■ AJOITE Christmas Mine, Gila County, Arizona USA 14 ALUMINITE Railway cutting...Nandan Co, China brown chips, probably mixed with Goethite and Lepidocrocite. 3mm £3 FeO"OH Cl 69 ALUMOHYDROCALCITE...~-------·-·-- ·· -·· 1077 ■■ ALLOPHANE Hawkswood Mine, Cornwall 933 ANATASE Hingston Quarry,Cornwall Black |  | | Catalog/List | | ___ 2x2£3 ___ - -----~ - ~014_ _ 88 ADAMITE Ojuela Mine, Mapimi, Mexico 69 ALUMOHYDROCALCITE South Bay,...- - --··---- - - - - - · . 767 AJOITE Christmas Mine, Gila County, Arizona USA 17 ANAL CITE Talisker...1009 ANDALUSITE Ultevis,North Sweden 501 ALLOPHANE New East Whcal Russell mine, Devon ,England variety...217 ANDORITE San Jose Mine, Oruro, Bolivia 1129 ■ ALMANDINE Brnstad iron Mine near Arendnl ,Norway Pure...Bcnallt Minc,Llcyn. Wales 1036 ALSTONITE Fnllowlielcl Mine, Northumberland White masses in malrix wilh micro |
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