 | | 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 |  | | Journal (article/letter/editorial) | | Minerals from the Bingo Niobium Deposit, Kivu, Democratic Republic of Congo L. VaN WaMBZKE J o i n t Research...Italy Pandaite, cut by numerous veinlets of a crandallite containing St, Ba and RE was found during an...(Mount Home) in the north-eastern part of the Kivu, Democratic Republic of Congo (Kinshasa), was discovered...at Araxa, Brazil, and at Lueshe, Congo. Pandaite and Associated Crandallite A series of pyrochlore crystals...deposit. This mineral, not previously found in the Congo, is known from Panda Hill, Tanzania and from Araxa |  | | Journal (article/letter/editorial) | | meteoric alterations of the Lueshe carbonatite complex žDemocratic Republic of Congo / identified by a REE...whole-rock samples of the Lueshe carbonatite complex ŽNE of Democratic Republic of Congo.. The fresh and hydrothermally...fluorhydric-nitric solution ŽHF q HNO 3 .. The Lueshe carbonatite complex contains a suite of REE-carriers...Meteoric weathering; Rare-earth elements; Republic of Congo 1. Introduction Among the chemical characteristics...large quantities of Fig. 1. Geological map of the Lueshe complex Žmodified after Maravic et al., 1989.. |  | | Journal (article/letter/editorial) | | with hematite, goethite and minerals of the crandallite group. The different styles of mineralization...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) | | 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...Pyrochlore can also be partially replaced by crandallite (Wall et al., 1996) and gorceixenite (Lumpkin...pyrochlore pyrochlore,uranpyrochlore Mineral Lueshe, Dem. Rep. of Congo San Vicente, Cape Verde Is. Kovdor, |  | | Journal (article/letter/editorial) | | 8 , * ~ 0 . 2 , w = 0 and 0 . 2 < n < l ) from Lueshe, Zaire is a defect pyrochlore species whose A-site...refinement, powder pattern I. INTRODUCTION The Lueshe cancrinite syenite/carbonatite complex is located...pyrochlore subgroup, from the residual soils of the Lueshe carbonatite deposit. The calculated density is...London show that the kalipyrochlore from the Lueshe deposit (Kivu, Zaire) has a formula lying between the...Goreaud D., and Raveau B. (1980). "Alunite and crandallite: a structure derived from that of pyrochlore |  | 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) | | absence of hydrated aluminium phosphates of the crandallite group. The transitional zone grades from ferrocarbonatite...carbonatites elsewhere in Africa (e.g. Lueshe, Democratic Republic of the Congo), the Buru carbonatite centre...weathered crusts. It also has been reported from the Lueshe carbonatite complex, where it was observed to be...and encouragement given by Prof. A.E. Fallick and Dr A. Boyce at the Scottish Universities Research and... LANTHANIDE MINERALIZATION, BURU CARBONATITE Lueshe, Kivu/NE Zaõ¨re: Petrographic and geochemical studies |  | | Journal (article/letter/editorial) | | and apatite and the formation of crandallite group minerals: ‘crandallite’ crystals of up to 40 mm size...More than twelve crandallite type cells can be identified in a single ‘crandallite’ grain. (4) Alteration...geochemistry, mineralogy, trace elements, leucoxene, crandallite, zircon, xenotime, pyrochlore, galena. * E-mail:...deposits of the Middle Timan are located in the North of European Russia, between the NE edge of the Russian...the karstic type. Pb. This group represents ‘crandallite’ mineralization within the pro le. The second |  | | 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 |  | | Journal (article/letter/editorial) | | monazite, xenotime, rhabdophane, churchite, and crandallite) as well as the co-localization of LREE with...coarse coal refuse were sampled from an underground mine wall and refuse pile, while the Central PA LKT underclay...and MKT underclay were sampled from a surface pit mine in Central PA. All four samples were crushed and...well as an altered aluminum phosphate known as crandallite (Ce, La-(CaAl 3 4 )(PO3 OH(OH)6 )) within the...the sample (Figure 2C–E). known as crandallite (Ce, La-(CaAl 3(PO4)(PO3OH(OH)6)) within the sample (Figure |  | | Book | | 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...zinc ore was quarried should become a neutral territory, called Neutral Moresnet. The village of Moresnet |  | 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 |  | Clark, A. M., Smith, D. A., Symes, R. F., Tandy, P. C., Hart, A. D. (1995) Catalogue of Type Mineral Specimens in the Natural History Museum, London - With an appendix listing mineral species and varieties originally described from the British Isles. Natural History Museum, London. | Book | | the description of the species nominates Socrates mine, Sonoma County, California, as the type locality... Aerugite (Neotype) BM 1963,00481 South Terras mine, St-Stephen-in-Brannel, Cornwall, England R.J. Davis...34. Afwillite (Cotype) BM 1925,00080 Dutoitspan mine, Kimberley, South Africa J. Parry and F. E. Wright...277. Agardite (Cotype) BM 1978,00024 Bou Skour mine, Bou Azzer, Jbel Sarho, Morocco J.E. Dietrich, M...199. Apachite (Cotype) BM 1980, 00532 Christmas Mine, Gila Co., Arizona, USA F.P. Cesbron & S.A. Williams |  | | Report (issue) | | for foreign countries, if a given name refers to a mine or deposit, a nearby location or administrative...names may be used to refer to a single deposit or mine. For large deposits or mineralized areas, a 3 single...is meant to identify the area, deposit, district, mine, or occurrence to which the geologic, economic,...Detterman, R.L., 1989, Triassic phosphate deposits, north-eastern Alaska, USA, in Notholt, A.J.G., Sheldon... M.P., 1993, Digital metallogenic data set for North America and South America: U.S. Geological Survey |  | Decrée, Sophie, Boulvais, Philippe, Tack, Luc, André, Luc, Baele, Jean-Marc (2016) Fluorapatite in carbonatite-related phosphate deposits: the case of the Matongo carbonatite (Burundi) Mineralium Deposita, 51 (4) 453-466 doi:10.1007/s00126-015-0620-1 | Journal (article/letter/editorial) | | Indeed, closer to the surface, an association of crandallite, goyazite, and wavellite has been reported in...the well-known Nb Miner Deposita deposits of Lueshe, in DRC (a weathered cap containing an average...exploitation of REE as by-product of the phosphate mine (Ghorbani 2013). Therefore, considering the REE...Van der Beek et al. 1998). At the margin of the Congo River Basin, however, the Neogene seems to be a...cobalt and manganese ores in the Katanga province, DR Congo. Mineral Deposits 45(7): 621–629 Decrée S, Boulvais |  | | 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...fumarole on Cerro Pululus, north-west Argentina, appear to be F%As20 n. Named after Dr. V. Angelelli, Director...a fissure mineral at Lhngban, Sweden. Named after Dr. Ragnar Blix. [M.A. 14-416.] Bobkowit. Gerlnan transliteration...List), named by J. de Lapparent (1927) in honour of Dr. Johann Bahm of Berlin; corrected in ~r Jahrb. Min |  | | Journal (article/letter/editorial) | | ~Jt-ILl n"LL mo FLUOCERITE Ce La PYROMORPHITE CRANDALLITE -FLORENCITE SERIES KAOLINITE F i g . i: S e q...These rocks are very similar to those of the Lueshe area, Kivu, Za'ire, where a carbonatite deposit occurs |  | | Book (edition) | | This book is respectfully dedicated to the memory of Dr. John Sinkankas for his kind initiative and support...Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California, G Publi!>hed by Grdllit.u.o. Stefanikova43...by Strunz (1996). Thanks to the kind permission of Dr. E. Nagele from the E. Schweizerbart'sche Verlagsbuchhandlung...arisen with localities in Congo-Zaire: the country, named Democratic Republic of Congo since 1960, was changed...The former Kivu province is now divided to three regions: INTRODUCTION Nord-Kivu, Sud-Kivu, and Maniema |  | Duma ska-S owik, M., Pieczka, A., Tempesta, G., Olejniczak, Z., Heflik, W. (2014) "Silicified" pyrochlore from nepheline syenite (mariupolite) of the Mariupol Massif, SE Ukraine: A new insight into the role of silicon in the pyrochlore structure. American Mineralogist, 99 (10) 2008-2017 doi:10.2138/am-2014-4896 | Journal (article/letter/editorial) | | (1996) noted also a reaction rim composed of crandallite around the altered pyrochlore. Initially, the...(2000) Pyrochlores from Lueshe carbonatite complex (Democratic Republic of Congo): A geochemical record...(1996) Pyrochlore from weathered carbonatite at Lueshe, Zaire. Mineralogical Magazine, 60, 731–750. Manuscript |  | Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673 | Journal (article/letter/editorial) | | Goreaud, M. & Raveau, B. (1980): Alunite and crandallite: a structure derived from that of pyrochlore...Sekiuchi, K. & Suzuki, Y. (1996): Romeite from Gozaisho mine, Iwaki, Japan. Mineralogical Journal 18(4), 155-160...(2000): Pyrochlores from the Lueshe carbonatite complex (Democratic Republic of Congo): a geochemical record...in weathered pyrochlore-group minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer...(1996): Pyrochlore from weathered carbonatite at Lueshe, Zaire. Mineralogical Magazine 60, 731-750. Wang |  | 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) | | deposit is located within the Balaio Indigenous Territory, within the Pico da Neblina National Park, and...strontiopyrochlore (Lapin and Kulikova, 1989). At Lueshe (Wall et al., 1996), the most K-Nb-rich pyrochlore...carbonatites was described at Lueshe (Democratic Republic of the Congo) by Wall et al. (1996), who noted...goethite occurring as anhedral inclusions in crandallite was unambiguous. In other samples, from highly...Jr., 2012. Rare earth mining and exploration in North America. Elements 8, 369-375. Mitchell, R.H., 2005 |  | | 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 |  | | 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...~-------·-·-- ·· -·· 1077 ■■ ALLOPHANE Hawkswood Mine, Cornwall 933 ANATASE Hingston Quarry,Cornwall Black...Kola Russia 501 ALLOPHANE New East Wheal Russell mine, Devon ,England grey bleby small botryoidal with |
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