 | | Journal (article/letter/editorial) | | the Kymi stock, a topaz granite cupola within the Wiborg rapakivi batholith, Finland Ilmari Haapala*,... Physicum), FI-00014, University of Helsinki, Finland Received 28 July 2003; accepted 9 September 2004...stockscheider pegmatite, equigranular topaz granite, porphyritic topaz granite. The contact between the two...The equigranular granite contains 1 to 4 vol.% topaz, and its biotite is lithian siderophyllite; the...the porphyritic granite has 0 to 3 vol.% topaz, and the mica is siderophyllite. The equigranular granite |  | | Journal (article/letter/editorial) | | quartzâmuscovite (+fluorite), and quartzâmuscoviteâtopaz greisens from the Primorsky rapakivi granite complex...cassiterite, ferrocolumbite (Ta/Nb = 0.02â0.06), pyrochloregroup minerals, ilmenorutile, rutile, wolframite...assemblage is contained in the quartzâ muscoviteâtopaz greisen as a result of an increase in Eh and decrease...Sharyzhalgai Group in the southwest, con tact with rocks of the Paleoproterozoic Sarma Group in the northeast...Neoproterozoic sedi mentary rocks of the Baikal Group in the west. The most reliable age of the Primorsky |  | | Journal (article/letter/editorial) | | County, not Prince Wil liam County. of the Pyrochlore Group" by D. D. Ho garth which appeared in American...approved revised nomenclature for the pyrochlore group. The group, Dr. Wyman goes on to say that he got...three specimen is from Cloverdale, Sonoma namesâpyrochlore, microlite, and betafite- County and Peoples...changes are a boon to the understanding of the group. It is Some gold was purchased from a dealer sad...recently, with its usual imprecise stateof "new" pyrochlore group minerals of name-only locality label. The |  | | Journal (article/letter/editorial) | | apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite...Compositional variation was studied in columbite-group minerals from the beryl-columbite pegmatite at Scheibengraben...units except the cleavelandite unit. Columbite-group minerals are the dominant Nb,Ta-oxide phases in...with other Nb,Ta-oxide minerals: minerals of the pyrochlore subgroup and fersmite in the coarse-grained unit...0.22) 0.35 to 0.90] fractionations in columbite-group minerals differ from those observed in beryl pegmatites |  | | Journal (article/letter/editorial) | | gleichbleibendem Mn. Introduction Columbite-tantalite group minerals are ubiquitous in beryl-, complex-, albitespodumene-...(CĂernyĂ et al., 1985). The columbite-tantalite group minerals are therefore important in deciphering...of columbite-tantalite group minerals from the Separation Rapids pegmatite group in N.W. Ontario ± a suite...Geological setting The Separation Rapids pegmatite group and the pluton with which it is associated lie almost...and mineralogy, the Separation Rapids pegmatite group is regarded as the easterly extension of the Winnipeg |  | | Journal (article/letter/editorial) | | © by Springer-Verlag 1988 Scandian Ixiolite, Pyrochlore and Bazzite in Granite Pegmatite in Tordal, Telemark...(Ta,Nb,Sc,Sn,Fe,Mn,Ti)204 in association with pyrochlore, (Ca,Sc,Y,Sn,U)2(Ta,Nb,Ti)206(O,OH,F) and bazzite...pegmatite veins. Alteration from ixiolite to pyrochlore appears as a late magmatic-hydrothermal event...niobium-tantalum-dominated oxides ixiolite and pyrochlore have been found together with the scandium-rich...outlier, which may be correlated with the Rjukan Group of the Telemark Supracrustal Suite (1 300-1 200 |  | | Journal (issue) | | garnets and some classic topaz crystals and members of the tourmaline group that he associated with his...beryllium phosphate mineral, found at the Nevel quarry an Newry, Maine, was given the name gainesite in...10/#5 Thomas & Wah Wah Ranges (Utah) (famous for Topaz, Red Beryl, etc) $10 v .ll/# l Toxic Minerals Barite...v.15/#6 $10 Jacupiranga mine (Brazil), Jensen quarry (CA), Cunha Baixa mine, Paulkerrite $10 Bad Ems...Hills type locali ties, Urucum (Brazil), Kalkar quarry (CA), Kremsmiinster $10 v.17/#6 Bleiberg (Austria) |  | | Journal (article/letter/editorial) | | MINERAL PARAGENESES Compositional Variations of Pyrochlore Group Minerals in Ongonite and Zwitter of the Verkhneurmiysky...2017; accepted August 15, 2017 AbstractâThe pyrochlore-group minerals in ongonite and zwitter of the Verkhneurmiysky...rare species of pyrochlore, pyrochlore-I and pyrochlore-II in ongonite, and pyrochlore-III in zwitter...the Russian Far East. Pyrochlore-I is a possible new member of the pyrochlore group, bismuth-bearing âoxyferropyrochloreâ;...âoxyferropyrochloreâ; pyrochlore-II is an uranium-bearing and iron-bearing hydrokenopyrochlore; and pyrochlore-III is |  | | Journal (article/letter/editorial) | | the Yichun granite complex (SE China), columbite group minerals, microlite and cassiterite are the main...granite. The chemical evolution of the columbite group minerals (the most abundant and commonly zoned Nb...Li-mica granite and then the most fractionated topaz-lepidolite granite; and (2) emplacement of successive...Snbearing minerals (especially of the columbite group). The Yichun granitic complex (SE China) represents...Ta-bearing rutile, Fe-rich and then Mn-rich columbite group minerals with cassiterite, and  nally microlite |  | ÄernĂœ, Petr, Chapman, Ron, Ferreira, Karen, Smeds, Sten-Anders (2004) Geochemistry of oxide minerals of Nb, Ta, Sn, and Sb in the VarutrĂ€sk granitic pegmatite, Sweden: The case of an âanomalousâ columbite-tantalite trend. American Mineralogist, 89 (4) 505-518 doi:10.2138/am-2004-0405 | Journal (article/letter/editorial) | | Consequently, the compositional trends of columbite-group minerals and cassiterite mimic those typically displayed...degree of cation order in the VarutrĂ€sk columbite-group minerals increases from early to late phases, and...approach to chemical equilibrium, but columbite-group inclusions in cassiterite show in part a compositional...whereas the more widespread pyrochlore-microlite metasomatic after columbite-group minerals reflects the Ta/(Ta...several grains of primary and metasomatic pyrochlore-group phases that also are enriched in Sb, but not |  | | Journal (article/letter/editorial) | | been covered by ongoing road construction. PYROCHLORE-GROUP MINERALS FROM THE WAUSAU COMPLEX, MARATHON...quarries have considerably expanded knowledge of pyrochlore group minerals in the Wausau Complex. Previous work...work (Falster et al. 2000) reported pyrochlore, ceriopyrochlore, bario-ceriopyrochlore, and yttropyrochlore...sampled include several pegmatites in the Dehnel quarry, an ROCKS & MINERALS 166-170 Rochester.indd 166...replacement of, and also as an overgrowth on, columbite-group minerals. Plumbopyrochlore and microlite have been |  | CĂĄmara, F., Williams, C. T., Della Ventura, G., Oberti, R., Caprilli, E. (2004) Non-metamict betafite from Le Carcarelle (Vico volcanic complex, Italy): occurrence and crystal structure. Mineralogical Magazine, 68 (6) 939-950 doi:10.1180/0026461046860224 | Journal (article/letter/editorial) | | Italy 2 ABSTR ACT Non-metamict betafite, a pyrochlore-group mineral with general formula A2 mB2XO6Y(O...static disorder at the X site. K EY WORDS : pyrochlore, crystal structure, betaïŹte, electron microprobe...microprobe analysis, Latium, Italy. Introduction PYROCHLORE-GROUP minerals are cubic oxides common as accessory...(Lumpkin and Ewing, 1988). In stoichiometric pyrochlore, charge balance is maintained by heterovalent...vacancies, and suggested an upper limit of p = 1.75. Pyrochlore minerals are classiïŹed into three subgroups on |  | | Journal (article/letter/editorial) | | follow. Ta, Nb, U, Y, AND REE MINERALS OF THE KOSS QUARRY, MARATHON COUNTY, WISCONSIN. T. N Buchholz,â A...recently opened Koss (weathered granite. grus) quarry is located in the central portion of the Proterozoic...complex. Pegmatites are locally abundant in the Koss quarry and have furnished a large number of minerals from...from pockets and associated vuggy zones. The quarry was tirst 170 ROCKS & MINERALS opened in early...virtually absent. The recent discoveries in the Koss quarry include the following species. Ferrocolumbite and |  | | Book | | pegmatite minerals from Ytterby, Sweden and Kimito, Finland. The new "element" was named after the Greek mythologieal...Ercit (with 21 Figures) . . . . . . 3 27 Pyrochlore Group Minerals from the Qaqarssuk Carbonatite Complex...C.A. Arrhenius observed an unknown minerat in a quarry located at Ytterby, near Stockholm, and worked...International Mineralogical Association (IMA). A group name, bastnaesite, for instance, is proposed for...element to the group name: bastnaesite-(La), bastnaesite-(Y) etc. Table 1 gives these group names with the |  | | Journal (article/letter/editorial) | | CRYSTALLIZATION OF THE KYMI TOPAZ GRANITE STOCK WITHIN THE WIBORG RAPAKIVI GRANITE BATHOLITH, FINLAND: EVIDENCE FROM...P.O. Box 64, FIâ00014 University of Helsinki, Finland Rainer THOMAS GeoForschungsZentrum, Potsdam, Telegrafenberg...of Helsinki, Finland Abstract The crystallization of the late-stage F-enriched Kymi topaz granite, in...in southeastern Finland, has been investigated by remelting and analyzing crystallized melt inclusions...inclusions in quartz and topaz grains from porphyritic and equigranular topaz granites and marginal pegmatite. |  | Bastos Neto, A. C., Pereira, V. P., Ronchi, L. H., de Lima, E. F., Frantz, J. C. (2009) THE WORLD-CLASS Sn, Nb, Ta, F (Y, REE, Li) DEPOSIT AND THE MASSIVE CRYOLITE ASSOCIATED WITH THE ALBITE-ENRICHED FACIES OF THE MADEIRA A-TYPE GRANITE, PITINGA MINING DISTRICT, AMAZONAS STATE, BRAZIL. The Canadian Mineralogist, 47 (6) 1329-1357 doi:10.3749/canmin.47.6.1329 | Journal (article/letter/editorial) | | which is hosted by A-type volcanic rocks (IricoumĂ© Group, ~1880 Ma) formed in a caldera complex. The deposit...the rock matrix, (2) conversion of pyrochlore to a columbite-group mineral, characterized by gradual loss...Pitinga is briefly discussed. Keywords: cryolite, pyrochlore, gagarinite, albite-enriched granite, A-type...dans la matrice des roches, (2) conversion du pyrochlore en un membre du groupe de la columbite, avec...(Traduit par la RĂ©daction) Mots-clĂ©s: cryolite, pyrochlore, gagarinite, granite enrichi en albite, granite |  | PrĆĄek, Jaroslav, Majka, Jaroslaw, Uher, Pavel, ChudĂk, Peter (2010) Niobium-tantalum minerals in the Skoddefjellet NYF granitic pegmatite, Svalbard Archipelago, Norway: Primary versus secondary assemblage. Neues Jahrbuch fĂŒr Mineralogie - Abhandlungen, 187 (3) 235-248 doi:10.1127/0077-7757/2010/0172 | Journal (article/letter/editorial) | | †1.7 wt. % Ta2O5), ilmenite, fersmite and pyrochlore group minerals: including yttropyrochlore-(Y), plumbopyrochlore...and plumbobetafite. Internal zoning of columbite group minerals is expressed by distinct rimward increase...Ta-rich titanite, Nb,Ta-rich rutile, ilmenite, pyrochlore-group minerals, fersmite, NYF granitic pegmatite...is occupied by metasediments of the IsbjĂžrnhamna Group, which consists of paragneisses, calc-silicate schists...(BIRKENMAJER 1958, CZERNY et al. 1993). The IsbjĂžrnhamna Group rocks underwent a multistage metamorphic history |  | Costi, H. T., Dall'Agnol, R., Pichavant, M., Ramo, O. T. (2009) THE PERALKALINE TIN-MINERALIZED MADEIRA CRYOLITE ALBITE-RICH GRANITE OF PITINGA, AMAZONIAN CRATON, BRAZIL: PETROGRAPHY, MINERALOGY AND CRYSTALLIZATION PROCESSES. The Canadian Mineralogist, 47 (6) 1301-1327 doi:10.3749/canmin.47.6.1301 | Journal (article/letter/editorial) | | P.O. Box 64, FI-00014 University of Helsinki, Finland Abstract The 1.818 Ga magmatic, subsolvus, Madeira...calc-alkaline silicic volcanic rocks of the IricoumĂ© Group (UatumĂŁ Supergroup) and the associated A-type granites...Branca Suite and the volcanic rocks of the IricoumĂ© Group. These are intruded by two suites of A-type granite...magmatic rocks identified in this area. The IricoumĂ© Group is composed of rhyolite, dacite, andesite, trachyte...et al. 2006). The contacts between the IricoumĂ© Group and the granite plutons of the Madeira suite are |  | 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 CNMNCâIMA, 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, romĂ©ite, betafite, and elsmoreite...and one root name (identical to the name of the group). The first prefix refers to the dominant anion |  | | Journal (volume) | | into the Middle Urals - the Tokovaya emerald pits, topaz from Murzinka, and malachite, pseudomalachite and...Lobachevskaya mine # 84 . Photo: V.A. Popov The quarry of mi ne II 2 of the Selyankinskoe deposit of ilmenorutile...1773. Later in 1777-1780, pegmatite veins with topaz, beryl, and amazonite were intensely developed by...Luginins, the owners of the Miass plant. Some rare topaz crystals weighed 6-7 and even up to I0 pounds. In...("dichroite"), scapolite, titanite ("sphene") , topaz, fluorite, fluorapatite ("Saxon beryl "), zircon |  | Guang, Fan, Xiangkun, Ge, Guowu, Li, Apeng, Yu, Ganfu, Shen (2017) Oxynatromicrolite,
(Na,Ca,U)2Ta2O6(O,F), a new member of
the pyrochlore supergroup from Guanpo, Henan Province, China. Mineralogical Magazine, 81 (4) 743-751 doi:10.1180/minmag.2016.080.121 | Journal (article/letter/editorial) | | Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China...Christy] ABSTR ACT A new mineral species of the pyrochlore supergroup, oxynatromicrolite (IMA2013-063),... with space group Fd3m and with unit-cell parameters similar those of other pyrochlore supergroup species:...oxynatromicrolite, new mineral species, microlite group, pyrochlore supergroup, Guanpo, Henan, China. Introduction...crystallize in the isometric crystal system (space group Fd3m or its subgroup) with a unit cell characterized |  | Breiter, Karel, KorbelovĂĄ, Zuzana, ChlĂĄdek, Ć tÄpĂĄn, Uher, Pavel, Knesl, Ilja, Rambousek, Petr, Honig, Sven, Ć eĆĄulka, VojtÄch (2017) Diversity of TiâSnâWâNbâTa oxide minerals in the classic granite-related magmaticâhydrothermal CĂnovec/Zinnwald SnâWâLi deposit (Czech Republic) European Journal of Mineralogy, 29 (4) 727-738 doi:10.1127/ejm/2017/0029-2650 | Journal (article/letter/editorial) | | bodies, both composed of quartz, zinnwaldite and topaz and minor amounts of ïŹuorite and TiâSnâWâNbâTa oxide...columbite-(Fe) and -(Mn), and minerals of the pyrochlore-supergroup were found in biotite granite in deeper...the cupola, Ta-rich cassiterite, microlite and pyrochlore are frequently observed. The greisens host predominantly...cassiterite, which are accompanied by columbite-group minerals, rare W-rich ixiolite and qitianlingite... whereas W-rich ixiolite, qitianlingite, and pyrochlore-supergroup minerals appear to belong to the later |  | | Journal (article/letter/editorial) | | Conf. thortveitite. And minerals of the pyrochlore-microlite group contains from 1-5 wt. % Sn02, while the...fluorite, and some F in the micas. No trace of topaz. Among the alkali metals Caesium is a significant...amazonitelepidolite pegmatite in the nearby HĂžydalen quarry (Oftedal 1943, Kristiansen 1998). The mineralogy...19% SC203 and scandian members of the pyrochlore-microlite group. Shortly after they also reported finding...blastings in fall 1998, and the summer 2003 the quarry is still rather modest in size. Today approx. 1m |  | Benaouda, Rachid, Kraemer, Dennis, Sitnikova, Maria, Goldmann, Simon, Schwarz-Schampera, Ulrich, Errami, Abdellatif, Mouttaqi, Abdellah, Bau, Michael (2020) Discovery of high-grade REE-Nb-Fe mineralization associated with calciocarbonatite in south Morocco. Ore Geology Reviews, 124. 103631pp. doi:10.1016/j.oregeorev.2020.103631 | Journal (article/letter/editorial) | | zones, which contain bastnaesite and 20 pyrochlore-group minerals as the main REE and Nb ore minerals...the associated Fe-oxide 23 mineralization, pyrochlore and monazite-(Ce) are the main ore minerals occurring...Bastnaesite commonly forms prismatic aggregates whereas pyrochlore and 28 ceriopyrochlore usually display subhedral...unit for REE and Nb deposits in Morocco (e.g. pyrochlore, monazite- 57 (Ce), parisite-(Ce) and synchysite-(Ce))...chemistry of the 81 main ore minerals bastnaesite, pyrochlore and ceriopyrochlore in the carbonatite, 82 |  | | Journal (article/letter/editorial) | | up to 19.3 wt.% MnO, and a Mn-dominant apatite-group mineral containing up to 31.5 wt.% MnO, are two...Argentina (Hurlbut & Aristarain 1968), and later from Finland (Lahti 1981), Namibia (Fransolet et al. 1986),...ite members, fersmite, various pyrochlore-group minerals (pyrochlore, microlite and betafite enriched...Fe apfu) as mean values, and it is the apatite-group mineral richest in Mn known worldwide, with a relatively... Homogeneous relics of the Mn-dominant apatite-group mineral (marked by arrows) occurring close to beusite |
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