 | | Report (issue) | | Pyrochlore (Ca, Na)2Nb2 O6 (OH, F) c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Cubic;...Cubic; typically metamict. Point Group: 4/m 3 2/m. Typically octahedra, modified by {001}, {011}, {112}...10.4, (680) 10.4, (700) 10.4 Cell Data: Space Group: F d3m. a = 10.35–10.47 Z=8 X-ray Powder Pattern:...Series: Mineral Group: NbB > TaB . Forms a series with microlite. Pyrochlore group and subgroup; (Na...Narssârssuk, Greenland. From the Mbeya carbonatite, Panda Hill, near Mbeya, Tanzania. On Rouma Isle, Los Islands |  | | Journal (article/letter/editorial) | | A hydrated barium-strontium pyrochlore in a biotite roclc from Panda Hill, Tanganyilca. 1 B y E. J~iGE~...1958.] Summary. A hydrated barium-strontium pyrochlore with only subordinate amounts of Ca and Na has...biotite rock (contact-rock of a carbonatite) from Panda Hill, Tanganyika, as small euhedral yellowish-grey...orthoclase, and several other minerals. Hydrated Ba-Sr pyrochlore is isotropic, the refractive index varies from... H. 489 Poor {111} cleavage. The pyrochlore structure (space-group O~-Fd3m) and the unit-cell dimensions |  | | Journal (article/letter/editorial) | | 1995 Geochemical alteration of pyrochlore group minerals: Pyrochlore subgroup GnnconY R. LuvrpxrN Advanced...and high pH. In contrast, primary alteration of pyrochlore from nepheline syenitesand carbonatitesfollows...ADYE. In carbonatites, primary alteration of pyrochlore probably took place during and after replacementof...Na-Ca-Fe-Nb-O-H indicate that replacement of pyrochlore by fersmite and columbite occurred at similar...as a result of alteration. IxrnonucnoN The pyrochlore group consists of a chemically diverse suite of |  | | Journal (article/letter/editorial) | | Vol. 64(4), pp. 683–697 Primary zoning in pyrochlore group minerals from carbonatites D. D. HOGARTH1...University, Ottawa, Canada K1S 5B6 2 ABSTR ACT Pyrochlore group minerals have the general formula A16 xB... Ta, Ti and Z being O, F, OH. In this study, pyrochlore specimens were examined from carbonatites at...Carillon Dam, Chilwa Island, Fen, Lueshe, Oka, Mbeya, Meech Lake and Verity. Primary features include...especially characterized by replacement rims, pyrochlore-inpyrochlore veinlets and low A-ion totals (Carillon |  | | Journal (article/letter/editorial) | | xxxx Keywords: Carbonatites Niobium ore deposits Pyrochlore Laterite Supergene ores a b s t r a c t This...deposit is unique with respect to the varieties of pyrochlore present; extent of replacement by other minerals;...units of carbonatite contain distinct suites of pyrochlore. Bulk rock analysis for Nb gives no indication...and physical concentration of resistant primary pyrochlore. Intense lateritization results initially in...pyrochlores, and ultimately complete decomposition of pyrochlore and formation of Nb-bearing rutile, brookite |  | | Journal (article/letter/editorial) | | photographs show the mineral to be orthorhombic, space group P m n2 or P m m n; the unit cell has o 13.05+0.06...photographs show the mineral to be triclinic, space group Cr1, or Cr,, 4 6 5 . 0 3 , b 6 6 . 4 9 , c n 7 ...pattern and physical properties, but not in space group or unit ceil constants with veatchite from California...California, and is named 1-veatchite. It has space group P2tfm or P 2 y , a s 6 . 7 2 , b 0 2 0 . 8 1c, o...r n i a ( C l a r k e t a l . , 1958) has space group A 2f a or Aa, a0 20.81, b0 11.75, co 6.632A, B 92"2' |  | | Journal (issue) | | niet over goud of zilver gaat maar wel over Garnet Hill, 15 km noordwest van Ely (4 pp) - een vindplaats...regelmatig aan in de betere mineralenmagazines. Majuba Hill (8 pp) is economisch gezien een eerder middelmatige...crossroads enigma, Wikes Co., Georgia 3-5 The Sterling Hill mining museum Super Dig 2013 5-6 Fluorescent mineral...485-504 Minerals of the Kaokoveld District, Kunene Region, Namibia 509-534 The best zincite crystals from...Darrellhenryite, a new mineral from the tourmaline group 1893-1898 Nizamoffite, the Mn analogue of hopeite |  | Cordeiro, Pedro Filipe de Oliveira, Brod, José Affonso, Palmieri, Matheus, de Oliveira, Claudinei Gouveia, Barbosa, Elisa Soares Rocha, Santos, Roberto Ventura, Gaspar, José Carlos, Assis, Luis Carlos (2011) The Catalão I niobium deposit, central Brazil: Resources, geology and pyrochlore chemistry. Ore Geology Reviews, 41 (1) 112-121 doi:10.1016/j.oregeorev.2011.06.013 | Journal (article/letter/editorial) | | deposit, central Brazil: Resources, geology and pyrochlore chemistry Pedro Filipe de Oliveira Cordeiro a...Keywords: Catalão I Carbonatite Phoscorite Nelsonite Pyrochlore a b s t r a c t The Catalão I alkaline–carbonatite–phoscorite...detail, the orebodies consist of dike swarms of pyrochlore-bearing, olivine-free phoscorite-series rocks...abundant niobium phases in the fresh rock deposit. Pyrochlore supergroup chemistry shows a compositional trend... Carbonates associated with Ba-, Sr-enriched pyrochlore show higher δ18OSMOW than expected for carbonates |  | | Book (edition) | | petrologists as those of the undersaturated alkalic group—the nepheline syenites and their relatives. Rare...and A. Holmes (1950) : Tanzania Geological Survey and N. J. Guest (1954) : Tanzania Geological Survey and...Tidsskrift and K. S. Heier (1961) Figure 15-9: Tanzania Geological Survey and N. J. Guest (1954) Figure...Jr., completed most of the field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913...accepted the idea of an igneous origin for the Iron Hill carbonatite. In 1924 Bowen, who had visited the |  | | Journal (article/letter/editorial) | | Mineralogy and genesis of pyrochlore-apatitite from The Good Hope Carbonatite, Ontario: A potential Nb...Ontario, Canada P7B 5E1; 2 The Wahl Prospecting Group, Box 1022, Marathon, Ontario, P0T 2E0 ; 3Plato Gold...phlogopite + potassium feldspar together with pyrochlore-bearing apatitite clasts. The apatitite occurs...clasts up to 5 cm in maximum dimensions. In these pyrochlore occurs principally as euhedral single crystals...compositionally- and texturally-distinct suites of pyrochlore. The pyrochlores are hosted by small prismatic |  | | Journal (article/letter/editorial) | | Formation tuffs of the Rukwa Rift Basin, southwestern Tanzania L. Lawrence, C. Spandler, E.M. Roberts, H.L....Formation tuffs of the Rukwa Rift Basin, southwestern Tanzania, LITHOS (2020), https://doi.org/10.1016/j.lithos...occurring ~400 km beneath Ethiopia, Kenya and Tanzania, defined as the African superswell (Nyblade, 2011)...Africa – the Red Sandstone Group (Fig.1). Within the Red na Sandstone Group is the Oligocene-aged Nsungwe...the Usangu Basin and Tukuyu Journal Pre-proof region of the Rungwe Volcanic Province (RVP) (Fig. 1b) |  | | Journal (article/letter/editorial) | | Pyrochlore from weathered carbonatite at Lueshe, Zaire F. WALl.,C. T. WILLIAMS,A. R. WOOIJ.EY Department...France Abstract A detailed study of weathered pyrochlore in the laterite above carbonatite at Lueshe,...determine its chemical and textural variations. Pyrochlore in fresh carbonatite at Lueshe is close to an...appears common to weathered pyrochlore worldwide. As a result weathered pyrochlore at Lueshe has a large apparent...showing that the actual composition of weathered pyrochlore is a characteristic of a particular deposit. |  | | Journal (article/letter/editorial) | | of Newcastle, New South Wales, Australia, 2Broken Hill Proprietary Company Limited, Central Research Laboratories...August 4, 1987; accepted October 22, 1987 Summary Pyrochlore is present as a residual mineral within a Mesozoic-Cainozoic...Leaching of the A-site ions Na and Ca from the pyrochlore structure occurred during weathering and the...which were subsequently filled by Fe 3+. The pyrochlore mineral chemistry changes markedly with depth...weathering profile and the sequence: Na-Ca pyrochlore, strontian pyrochlore, strontiopyrochlore, ceriopyrochlore |  | 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) | | Available online 28 June 2012 Keywords: Carbonatite Pyrochlore Niobium Magmatic Hydrothermal Supergenic a b...Tchivira carbonatites contain several pyrochlore generations. Rare pyrochlore crystals, close to the fluorcalciopyrochlore...carbonates and fluorite are also common. Distinct pyrochlore compositions are characteristic for each altered...Pb-pyrochlores and Nb-rich rutile replace earlier pyrochlore generations and are present as inclusions in...hydrothermal minerals. Textural evidences indicate that pyrochlore and these minerals are produced by precipitation |  | Walter, B.F., Parsapoor, A., Braunger, S., Marks, M.A.W., Wenzel, T., Martin, M., Markl, G. (2018) Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from the Kaiserstuhl volcanic complex (SW Germany) Chemical Geology, 498. 1-16 doi:10.1016/j.chemgeo.2018.08.008 | Journal (article/letter/editorial) | | Accepted Manuscript Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from...A.W. Marks, T. Wenzel, M. Martin, G. Markl , Pyrochlore as a monitor for magmatic and hydrothermal processes...the journal pertain. ACCEPTED MANUSCRIPT 1 Pyrochlore as a monitor for magmatic and hydrothermal processes...walter@uni-tuebingen.de ACCEPTED MANUSCRIPT 2 1. Abstract Pyrochlore from the Kaiserstuhl volcanic complex (SW Germany)...(Henkenberg, Kirchberg). Oscillatory-zoned F-rich pyrochlore with up to 69 wt.% Nb2O5 is common in all coarse-grained |  | | Journal (article/letter/editorial) | | nepheline–syenite (Zozulya et al., 2007). In the former, pyrochlore is only of mineralogical interest, GEOLOGY OF...Baerzhe; (35) Bonga; (36) Kaluwe; (37) Mrima Hill; (38) Panda Hill; (39) Oka; (40) Araxa; (41) Catalão I; (42)...Chuktukon Toongi Baerzhe Bonga Kaluwe Mrima Hill Panda Hill Oka Araxa Catalão I Catalão II Salitre Tapira...noted that pyrochlores constitute a quite large group of mineral species represented by niobates of complex...cations and anions (Atencio et al., 2010). This group includes multiple representatives and some newly |  | | Journal (article/letter/editorial) | | Alpha-Decay Damage in Minerals of the Pyroehlore Group Gregory R. Lumpkin and Rodney C. Ewing Department...study the effects of alpha-decay damage in pyrochlore group minerals, characterized by the general formula...al. 1985a, b, 1987). The structure of metamict pyrochlore consists of an aperiodic framework of corner-sharing...M distance. Introduction Minerals of the pyrochlore group (Fd3m, Z= 8) are among the common rare dement...radiation damage resulting from alpha decay. Pyrochlore structure types are one of the principal actinide |  | | Journal (volume) | | chemistry 17 Pyrochlore 18 Sphene 19 Zircon 19 Petrogenesis References ii Ilomba Hill from the Songwe...Photomicrograph of sphene-pyrochlore-aegirine rock showing metamict aegirine rims round pyrochlore crystals 16 15...Alkaline Complex to the Nachendezwaya Carbonatite, Tanzania 6 3 Ilomba rocks plotted on a Si0 2- Al 20 3-K...15 5 Radiometric map of the summit area, Ilomba Hill 16 TABLES 1 2 3 4 5 6 7 Geological history of...pyrochlorebearing pyroxeni te l 7 Analyses of uraniferous pyrochlore from the Ilomba Alkaline Complex and related |  | | Journal (article/letter/editorial) | | considered for potential coproduction of Ta and Nb. Pyrochlore (Nb–Ta), columbitetantalite (Nb–Ta), wodginite...Economically, significant deposits of Ta and Nb contain pyrochlore, columbite-tantalite, fersmite, loparite and...Tantalum . Rare-elements . Strategic metals . Pyrochlore . Columbite . Tantalite Introduction Tantalum...(Ta) and niobium (Nb) are transition metals in group 5 of the periodic table, have nearly identical atomic...Winter 2011). They are considered rare-elements, a group consisting of high-fieldstrength elements (HFSE; |  | | Journal (article/letter/editorial) | | -polymorphs (anatase, brookite and rutile) and three pyrochlore group members (hydroxycalcio-, fluorcalcio-, and...in the Petyayan-Vara) and minerals of the pyrochlore group. This process also caused niobium enrichment...elements. Keywords: metasomatism; brookite; anatase; pyrochlore; niobium; carbonatites; Vuoriyarvi massif 1...niobium concentrators are minerals of the pyrochlore group and, less frequently, the perovskite, columbite...which is much higher than in the largest known pyrochlore deposit. Hypergenesis certainly played a crucial |  | 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) | | 673-698 (2010) DOI : 10.3749/canmin.48.3.673 THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE Daniel ATENCIO§...Abstract A new scheme of nomenclature for the pyrochlore supergroup, approved by the CNMNC–IMA, is based...referred to until now as the pyrochlore group should be referred to as the pyrochlore supergroup, and the subgroups...Ta, Sb, Ti, and W. The recommended groups are pyrochlore, microlite, roméite, betafite, and elsmoreite...and one root name (identical to the name of the group). The first prefix refers to the dominant anion |  | Rampilova, Maria, Doroshkevich, Anna, Viladkar, Shrinivas, Zubakova, Elizaveta (2021) Mineralogy of Dolomite Carbonatites of Sevathur Complex, Tamil Nadu, India. Minerals, 11 (4) 355 doi:10.3390/min11040355 | Journal (article/letter/editorial) | | kinoshitalite component), amphibole and magnetite. Pyrochlore (rich in UO2 ), monazite-Ce, and barite are accessory...the Sevathur carbonatites lead to alteration of pyrochlore into hydropyrochlore, and Ba-enrichment. Also...Minerals 2021, 11, Keywords: dolomite carbonatites; pyrochlore; norsethite; benstonite; calcioburbankite; Sevathur;...Semenov recognized pyrochlore from the Sevathur carbonatite, and Borodin delineated pyrochlore-rich zones in...carbonatite occurrences were reported from this region, all of which are located along the same NE-trending |  | | Journal (article/letter/editorial) | | per unit cell]. From Dzhuzumli, Mt. Zirabulaksk region, Bukhara. Named after the alchemist Avieenna (Abu...Strunz, 1957. Min. Tabellen, 3rd edn, pp. 86, 109. A group name, including fiilSppite, zinckenite, robinsonite...Strunz, 1957. Min. Tabellen, 3rd edn, pp. 86, 108. A group name, including sartorite, baumhauerite, liveingite...Strunz, 1957. Mira Tabellen, 3rd edn, pp. 86, 106. A group name, including seligmannite, bournonite, aikinite...Strunz, 1957. Min. Tabellen, 3rd edn, pp 86, 107. A group name, including hutchinsonite, fiz61yite, ramdohrite |  | | Journal (article/letter/editorial) | | carbonatites and peralkaline igneous rocks. Columbite-group minerals (CGM) account for the majority of the current...as tapiolite, wodginite, ixiolite, rutile and pyrochlore-supergroup minerals are of minor importance....mineral supply chain due-diligence initiatives in the region and at the Ta (and Sn) smelter level, combined...deposits are members of the columbite-tantalite group (CGM), followed by tapiolite, ixiolite, wodginite...microlite. In alkaline granites and carbonatites, pyrochlore-goup minerals and lueshite are common. The most |  | Nedosekova, Irina, Vladykin, Nikolay, Udoratina, Oksana, Belyatsky, Boris (2021) Ore and Geochemical Specialization and Substance Sources of the Ural and Timan Carbonatite Complexes (Russia): Insights from Trace Element, Rb–Sr, and Sm–Nd Isotope Data. Minerals, 11 (7) 711 doi:10.3390/min11070711 | Journal (article/letter/editorial) | | signatures and ore specialization: Nb-deposits of pyrochlore carbonatites are associated with the IVC, while...moderately depleted mantle source for rocks and pyrochlore mineralization. The Buldym complex has a higher...carbonatites; Sr–Nd isotopes; Nb–REE deposits; pyrochlore; bastnäsite; Urals; Timan Received: 28 May 2021...production of rare earth elements of the cerium group. Carbonatites are usually cogenetic with alkaline...(Chadobetsky Uplift); the Nb–Ta–P Neske-Vaara (Kola region) deposits; and some others. Carbonatites of folded |
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Panda Hill, Mbeya, Mbeya Region, Tanzania