 | | Journal (article/letter/editorial) | | nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana A. R. Chakhmouradian and R. H. Mitchell...1999 Summary The pegmatites at Pegmatite Peak (Bearpaw Mts., Montana) crystallized from an evolved fraction...repositories for Sr, REE and Nb included betafite, loparite-(Ce), crichtonite and ilmenite-group minerals. Betafite...incompatible elements from the nepheline-syenite melt. Loparite-(Ce) evolved predominantly by depletion in Sr and...e. from strontian niobian loparite (up to 22.0 wt.% SrO) to niobian loparite (up to 17.6 wt.% Nb2Os). |  | | Journal (article/letter/editorial) | | alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic...Springer-Verlag 2002 Abstract At Gordon Butte (Crazy Mountains, Montana), agpaitic nepheline±syenite pegmatites intrude...malignites and nepheline microsyenites). All pegmatite veins are composed predominantly of potassium...aegirine, barytolamprophyllite, wadeite, eudialyte, loparite-(Ce) and altered rinkite (``vudyavrite'') embedded...included accessory zircon and thorite. Sr-rich loparite also precipitated relatively early serving as |  | | Conference Paper/Abstract | | associated alkaline rocks from Gordon Butte, Crazy Mountains (Montana) Roger H. Mitchell (Lakehead University)...Alkaline igneous rocks of central and western Montana (U.S.A.) exhibit a great petrographic diversity...Alkaline parageneses of different provenance from Montana have been shown to contain a variety of rare minerals...Mitchell 1999). Igneous lithologies of the Crazy Mountains area include a subalkaline series (gabbro-diorite-granite)...assemblages from the Gordon Butte area, northern Crazy Mountains. At Gordon Butte, four major intrusive series |  | | Journal (article/letter/editorial) | | contain euhedral crystals of niobian calcian loparite-(Ce) and, more commonly, ceroan lueshite that occurs...occurs as discrete oikocrysts and rims on the loparite-(Ce). The overall compositional range exhibited...(1996) established the compositional variation of loparite(Ce) across the same rock sequence. The details of...Mont SaintHilaire (Québec, Canada), and Bearpaw Mts. (Montana, USA). The present work also provides new...Mt. Vavnbed (as pseudomorphs after loparite), and from a pegmatite at Mt. Kuivchorr (as discrete crystals) |  | | Journal (article/letter/editorial) | | pp. 145-152 (2000) THE CRYSTAL STRUCTURES OF LOPARITE-(Ce) ROGER H. MITCHELL§ Department of Geology, Lakehead...of three compositionally distinct crystals of loparite-(Ce) have been determined by single-crystal X-ray...diffractometry using a CCD area detector. Niobian calcian loparite-(Ce) from the Khibina complex, in Russia, is orthorhombic...5.5084(14), c 7.7964(20) Å]. Calcian niobian loparite-(Ce) from the Lovozero complex, also in Russia,...7967(16) Å]. Strontian calcian loparite-(Ce) from the Bearpaw Mountains, in Montana, is tetragonal [I4/mcm; |  | | Journal (article/letter/editorial) | | of perovskite-type compounds in the tausonite-loparite series, (Sr1)2xNaxLax)TiO3 Received: 12 July...Perovskite-type compounds in the series tausonite-loparite, (Sr1)2xNaxLax)TiO3, were synthesized by solid-state...43210-1185, USA Key words Perovskite á Loparite á Tausonite á Structure Introduction Loparite, ideally...ideally (Na1/2Ln1/2)TiO3 (Ln = Ce, La, Nd, Pr), is a ubiquitous accessory mineral in agpaitic alkaline lithologies...carbonate rocks (Chakhmouradian and Mitchell 1997). Loparite-perovskite crystals with a complex zonation pattern |  | | Journal (article/letter/editorial) | | rosenbuschite, wöhlerite, eudialyte groups, as well as loparite-(Ce), occur in accessory amounts in nepheline trachyte...rocks; agpaitic minerals; eudialyte; rinkite; loparite; Angola 1. Introduction Undersaturated alkaline...Microscope (Thermo Fisher Scientific, Waltham, MA, USA) coupled with an INCA Energy 250 EDS microanalysis...microprobe (JEOL USA, Peabody, MA, USA) with five wavelength dispersive spectrometers (JEOL USA, Peabody, MA...MA, USA), also located at the Scientific and Technological Centres of the University of Barcelona. Operating |  | | Journal (article/letter/editorial) | | fluorapatite in a eudialyte-bearing nepheline syenite pegmatite. The overall compositional variation of these...intime avec une fluorapatite strontifère dans une pegmatite de composition de syénite néphélinique à eudialyte...site: strontium-apatite, belovite-(Ce), belovite-(La), deloneite-(Ce) and fluorcaphite. Crystal- 121 40#1-fév-02-2328-08...SrTiO3), NaK␣ (jadeite), LaL␣, CeL␣, PrL␣ and NdL␣ (loparite), BaL␣ (benitoite), AlK␣ (corundum), FeK␣ (ilmenite)...SrTiO3 (Sr), albite (Na), REE-doped glasses (La, Ce), barite (Ba), fayalite (Fe), orthoclase (K), diopside |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...The middle third of the state is known as the Montana alkali province where the sediments have MICHAEL...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University... the Rocky Mountains, and furthest to the northwest, the belt basin. The Rocky Mountains contain sedimentary |  | | Journal (article/letter/editorial) | | indicated by the replacement of early perovskite by loparite-(Ce) and ceroan lueshite. Separation of the fluid...described in this study [e.g., gittinsite, cerite-(Ce) and calcium catapleiite] are either extremely rare...amphibole, schorlomite, phlogopite, titanite, cerite-(Ce), chlorite, zircon, zirconosilicates, Ca–Al silicates...remplacement de la pérovskite précoce par la loparite-(Ce) et la lueshite enrichie en cérium. La séparation...Plusieurs minéraux signalés dans ce travail [e.g., gittinsite, cérite-(Ce) et calcium catapléiite] sont |  | | Journal (article/letter/editorial) | | Magazine, August 1999. Vol. 63(4), pp. 519-534 Loparite and 'metaloparite' from the Burpala alkaline complex...Chernogolovka, Moscow Region, Russia 101026 Loparite-(Ce) is a ubiquitous accessory mineral in modally...mineral approaches the ideal formula NaREETi206 (REE - Ce > La > Nd > Pr > Sin), and contains minor CaTiO3...using the Rietveld method, are given. At Burpala, loparite precipitated from an alkaline REE-rich fluid during...earlier-formed intrusive rocks. In some parageneses, loparite was replaced by 'metaloparite' during the final |  | Barkov, Andrei Y., Fleet, Michael E., Martin, Robert F., Men'shikov, Yuri P. (2006) Sr-Na-REE titanates of the crichtonite group from a fenitized megaxenolith, Khibina alkaline complex, Kola Peninsula, Russia: first occurrence and implications. European Journal of Mineralogy, 18 (4) 493-502 doi:10.1127/0935-1221/2006/0018-0493 | Journal (article/letter/editorial) | | related to crichtonite, landauite and davidite-(Ce,La), may represent potentially new members of the...affinity. Key-words: crichtonite, landauite, davidite-(Ce), titanates, oxide minerals, solid solutions, fenites...minerals related to crichtonite, landauite, davidite-(Ce), and davidite-(La), which expands the known compositional...(Sr), loveringite (Ca), landauite (Na), davidite-(Ce), davidite-(La), mathiasite (K), lindsleyite (Ba)...ilmenite, Narich phases related to loparite-(Ce), neighborite, monazite(Ce), and fluorite. Typically, the |  | Mitchell, R. H., Yakovenchuk, V. N., Chakhmouradian, A. R., Burns, P. C., Pakhomovsky, Y. A. (2000) Henrymeyerite, a new hollandite-type Ba-Fe titanate from the Kovdor Complex, Russia. The Canadian Mineralogist, 38 (3) 617-626 doi:10.2113/gscanmin.38.3.617 | Journal (article/letter/editorial) | | 963(1) Å, V 309.4(3) Å3. La structure cristalline de ce minéral a été affinée jusqu’à un résidu R1 = 0.027...wollastonite (Ca, Si), orthoclase (K), and loparite(Ce) (La, Ce, Nb). The accuracy of the method was confirmed...described in a “Ba–Ti hollandite” from the Tian Shan Mountains (Dmitriyeva et al. 1992) and the synthetic compound...minerals from some localities, e.g., Murun and Pegmatite Peak (Mitchell & Vladykin 1993, Chakhmouradian &...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana. Mineral. Petrol. 67, 85-110. CHEARY |  | Macdonald, Ray, Bagiński, Bogusław, Belkin, Harvey E., Stachowicz, Marcin (2019) Composition, paragenesis, and alteration of the chevkinite group of minerals. American Mineralogist, 104 (3) 348-369 doi:10.2138/am-2019-6772 | Journal (article/letter/editorial) | | post-2009 data. The Cr- and Mn-analogs of chevkinite-(Ce), polyakovite, and christofschäferite, respectively...Ce4Fe2+Ti2Ti2(Si2O7)2O8 be named dingdaohengite-(Ce), a proposal accepted by the CNMNC-IMA. Should all...be renamed dingdaohengite? In the type perrierite-(Ce), from Nettuno, Italy, Al is dominant in the C site...perrierite. If it is assumed that A = Ca, Sr, Y, La, Ce, Nd, Th; B = Mg, Mn, Fe2+; C = Al, Ti, Cr, Fe2+,...by Macdonald et al. (2009) of the type perrierite-(Ce) from Nettuno gave the formula A4.1BC1.9D2.0(Si2O7)2O8 |  | | Journal (article/letter/editorial) | | orthomagmatic fluorapatite; strontian britholite-(Ce); strontian fluorapatite; Sr-apatite; REE-rich Sr-apatite;...the stoichiometry of belovite-(Ce) and deloneite-(Ce); britholite-(Ce). Increasing alkalinity of the...solution towards belovite-(Ce), Si-rich belovite-(Ce) and strontian britholite-(Ce). K EY WORDS : lujavrite...alteration, strontian, Sr-apatite, britholite-(Ce), belovite-(Ce), Pilansberg. Introduction APATITE is a common...incompatible and volatile elements in late-magmatic, pegmatite and postmagmatic mineral parageneses. These substitutions |  | | Journal (article/letter/editorial) | | est associée à l’astrophyllite, bétafite riche en Ce, bétafite riche en Y, henrymeyerite, et banalsite...described by Černý et al. (1995) in a granite pegmatite contains considerably more total Ta plus Nb, but...synthetic standards were used: jadeite (Na), loparite (Ce, La, Pr, Nd), lueshite (Nb), orthoclase (K)...with EDS spectrum-stripping techniques. However, peak profiles used for the analytical lines were obtained...well-analyzed minerals such as lueshite, perovskite, loparite, eudialyte, benitoite, villiaumite and natrolite |  | | Journal (article/letter/editorial) | | spatially and genetically) are loparite-(Ce), cerite-(Ce), ancylite-(Ce), hibschite, chlinochlore-chamosite...(Zr), HfSiO4 (Hf), MnNb2O6 (Nb), REE glasses (La, Ce, Nd), and SrTiO3 (Sr). Raman spectra were collected...987 0.986 0.985 0.983 0.987 La – – – – – – – – – – Ce – 0.001 0.008 0.005 – 0.006 0.006 – – – Nd – – –...012 0.997 0.997 0.984 La – – – – – 0.003 – – – – Ce – – – – – 0.004 – – – – Y 1.009 1.004 0.999 1.002...996 0.991 0.974 0.983 0.971 1.001 1.009 0.961 1.007 Ce – – – – – – – – – 0.011 0.004 Nd – – – – – – – – |  | Liferovich, R. P., Mitchell, R. H., Zozulya, D. R., Shpachenko, A. K. (2006) Paragenesis and composition of banalsite, stronalsite, and their solid solution in nepheline syenite and ultramafic alkaline rocks. The Canadian Mineralogist, 44 (4) 929-942 doi:10.2113/gscanmin.44.4.929 | Journal (article/letter/editorial) | | 1–1.5 hours using natural lueshite, perovskite, loparite, eudialyte, benitoite, villiaumite, and jadeite...minerals, followed by late-stage pectolite, loparite(Ce) and marianoite (the Nb-analog of wöhlerite,...(UK), and Tony Nikischer (Excalibur Mineral Corp., USA) for providing stronalsite and banalsite samples...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts., Montana. Mineral. Petrol. 67, 85-110. Chakhmouradian...Zr-rich pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic |  | Morgenstern, Regine, Turnbull, Rose E., Ashwell, Paul A., Horton, Travis W., Oze, Christopher (2019) Petrological and geochemical characteristics of REE mineralization in the A-type French Creek Granite, New Zealand. Mineralium Deposita, 54 (7) 935-958 doi:10.1007/s00126-018-0854-9 | Journal (article/letter/editorial) | | apatite, fergusonite, monazite, perrierite, and loparite, which are commonly associated with interstitial...College, 1600 Campus Road, Los Angeles, CA 90041, USA Rare earth elements (REE) are a fundamental component...prospective^ for REE-Nb mineralization. The highest La + Ce + Y found in pan concentrate samples was 4633 ppm...Optical petrology In situ zircon and bastnäsite [(Ce,La)(CO3)F] from polished sections were analyzed at...was used for 10 bastnäsite spot analyses. Raw mass peak count rates were background subtracted, corrected |
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