 | | 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...mica, rutile, zircon, titaniferous magnetite and thorite. Precipitation of these phases was followed by...[chevkinite-(Ce)]. Strontiochevkinite from Pegmatite Peak is compositionally similar to the type material...yon Pegmatite Peak, Bearpaw Mrs., Montana Die Pegmatite yon Pegmatite Peak (Bearpaw Mts., Montana) sind |  | | 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) | | 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...paragenesis to crystallize included accessory zircon and thorite. Sr-rich loparite also precipitated relatively...Alkaline igneous rocks of central and western Montana (USA) exhibit great petrographic diversity, and are |  | | 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 |  | | | | Geological Survey, 956 National Center, Reston, VA 20192, USA 4 Camborne School of Mines, School of Geography,...presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland, Italy and India. The...IMA-approved) include perrierite-(La) found in a syenitic pegmatite from Bjørkedalen, Oslofjord, Norway (Segalstad...perrierite-(Ca) perrierite-(Ca) 7 8 Pegmatitic Bearpaw Mts, Montana Burley Farm, Virginia Bjørkedalen, Norway...East Antarctica nepheline syenite granitoid pegmatite syenite cutting gneisses strontio-chevkinite |  | | Report (volume) | | different splits of zircon. The few determinations on thorite show a poorer agreement with cogenetic zircon....-80+400 Mesh size Creede quadrangle, San Juan Mountains, Golo. D. Gottfried,G. Phair. Piedra rhyolite...volcanic series, San Critsobal quadrangle, San Juan Mountains, Colo. E. S. Larsen, Jr. Treasure Mountain rhyolite___...Alpine Gulch, San Cristobal quadrangle, San Juan Mountains, Colo. E. S. Larsen, Jr. Dacitic (?) , vitric...Santa Fe group, sec. 17, T.19N., R.9E., Santa Fe County, N. Mex. R. S. Cannon, Jr., R. L. Smith. ____.do__-______ |  | Cooper, Alan F., Collins, Alice K., Palin, J. Michael, Spratt, John (2015) Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand. Lithos, 216. 324-337 doi:10.1016/j.lithos.2015.01.005 | Journal (article/letter/editorial) | | dominated by calcite–ancylite–barite–monazite– thorite–albite–aeschynite–analcime, interpreted as modified... that contain the association ancylite–barite–thorite–monazite–calcite– analcime–aeschynite–albite. This...poikilitic barite and analcime, albite, muscovite, thorite, rare Nb-rutile and aeschynite. Emanating from...ankerite in dolomite. D. BSE image of zoning in thorite (OU 81155). The brightest reflectance corresponds...poikilitic calcite, barite, albite, monazite, thorite, aeschynite and analcime (Fig. 5A). In BSE images |  | | Journal (article/letter/editorial) | | Survey, 956 National Center, Reston, Virginia 20192, USA ABSTR ACT The composition of chevkinite and perrierite...Society from nepheline syenite pegmatites in Montana (Chakhmouradian and Mitchell, 1999), polyakovite...polyakovite, found in a dolomite vein in the Ilmen Mountains in the Urals, Russia (Popov et al., 2001), a Mg-Al-rich...analyses of chevkinite-group minerals from the western USA, Virginia, Russia, Malawi, Mali and Madagascar are...Tshirege Member of the Bandelier Tuff, Jemez Mountains, New Mexico, where it is associated with quartz |  | 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) | | site of an Fe-rich chevkinite-(Ce) from Mianning County, Sichuan, China, was given 2+ 2+ by Yang et al...inter alia, of perrierite-(Ce) from the Bearpaw Mountains, Montana, U.S.A. (0.35–1.18 apfu; Chakhmouradian...may be an artifact arising from Ti uncorrected for peak interference. Figure 9. La vs.Y plot to show that...described, from a fenitised granite in the Ilmen Mountains, southern Urals, Russia, a phase that they named...cross-cutting a phlogopite-olivine rock in the Ilmen Mountains (Popov et al. 2001). It is an unusual member of |  | | Journal (article/letter/editorial) | | britholite-(Ce) and pyrochlore), together with thorite, were late-stage interstitial products of the ...eudialyte, chevkinite-(Ce), britholite-(Ce) and thorite in the Azores. Petrography Analytical techniques...zircon, chevkinite-(Ce), pyrochlore, dalyite and thorite occur as accessory minerals among these syenites...aenigmatite, Zrc = zircon, Chv = chevkinite-(Ce), Thr = thorite, Dlt = dalyite, Prc = pyrochlore, tr = traces (vol...syenite pegmatites from Gordon Butte, Crazy Mountains (Montana, USA). They suggested that leaching of Na from |  | Krmíček, Lukáš, Cempírek, Jan, Havlín, Aleš, Přichystal, Antonín, Houzar, Stanislav, Krmíčková, Michaela, Gadas, Petr (2011) Mineralogy and petrogenesis of a Ba–Ti–Zr-rich peralkaline dyke from Šebkovice (Czech Republic): Recognition of the most lamproitic Variscan intrusion. Lithos, 121 (1) 74-86 doi:10.1016/j.lithos.2010.10.005 | Journal (article/letter/editorial) | | A few contacts between the dyke and an older pegmatite have been found. The dyke is at least 200 m long...each background corresponded to the one half of the peak counting time. The following standards were used...features were observed at the contact with the host pegmatite (Fig. 2a and b). The very fine-grained margin shows...fine-grained mixture of zircon, quartz, rutile I and rare thorite. Baotite is partially replaced by anhedral Ba-enriched...by medium-grained, mineralogically primitive pegmatite intruded by the very fine-grained border zone facies |  | Macdonald, R., Bagiński, B., Kartashov, P., Zozulya, D., Dzierżanowski, P. (2012) Chevkinite-group minerals from Russia and Mongolia: new compositional data from metasomatites and ore deposits. Mineralogical Magazine, 76 (3) 535-549 doi:10.1180/minmag.2012.076.3.06 | Journal (article/letter/editorial) | | from the apical parts of granitic bodies) and a pegmatite (sample 5745b). Sample K3 is from borehole DH#...Cr-rich CGM polyakovite-(Ce) is in the Ilmen mountains, southern Urals. It was found in a dolomite veinlet...CGM (sample K4) from a syenite pegmatite in vein 35, Vishnevye mountains, Chelyabinsk Oblast’, which is...probe current was 20 nA. Counting times were 20 s on peak and 10 s on each of two background positions. The...chevkinite-(Ce) Mineral metasomatite dolomite vein pegmatite pegmatite apatite ore ores associated ores associated |  | Macdonald, R., Bagiński, B., Kartashov, P. M., Zozulya, D., Dzierżnowski, P. (2015) Hydrothermal alteration of chevkinite-group minerals. Part 2. Metasomatite from the Keivy massif, Kola Peninsula, Russia. Mineralogical Magazine, 79 (5) 1039-1059 doi:10.1180/minmag.2015.079.5.02 | Journal (article/letter/editorial) | | includes, in addition to chevkinite(Ce), zircon, thorite, allanite-ferriallanite-(Ce), fergusonite-(Y),...ilmenite and rutile in the type locality, Radium Hill, South Australia (Gatehouse et al., 1979). In contrast...nepheline syenite pegmatites of Pegmatite Peaks, Bearpaw Mountains, Montana. Our sample appears to be the...Keivy 160b/62, the Baveno pink granite, El Muerto pegmatite and Pyrenean albitites are distributed along trends...Pyrénées, France (Monchoux et al., 2006), El Muerto pegmatite, Oaxaca, Mexico (Prol-Ledesma et al., 2012), pegmatites |  | 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) | | College, 1600 Campus Road, Los Angeles, CA 90041, USA Rare earth elements (REE) are a fundamental component...was used for 10 bastnäsite spot analyses. Raw mass peak count rates were background subtracted, corrected...image of porous zircon with xenotime rims and thorite inclusions (Townend and Townend 2016); f quartz...siderite; Sph, sphalerite; Syn, synchycite; Th, thorite; TiO2, titanium dioxide; Xe, xenotime; Zr, zircon...medium-grained texture with biotite-rich lenses. Pegmatite pods and microgranites occur in the Little Hohonu |  | | Journal (article/letter/editorial) | | (apfu) and are tentatively identified here as thorite (Fig. 7b). FIG. 6. Schematic drawing showing relationships...texture of Th-rich zircon and fractures filled with thorite (white), scale bar 50 m; (c) cluster of pseudododecahedral...Petrographic and chemical characteristics of the Panda Hill carbonatite complex, Tanzania. J. Afr. Earth Sci...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana. Mineral. Petrol. 67, 85-110. GILBERT...alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic |  | | Book | | Firefly Books Ltd. Buffalo, New York Richmond Hill, Ontario Published in the United States by PO....139) Page 248: Quartz (amethyst variety), Erongo Mountains, Namibia * 5 x 6 x 3 cm Page 251: Calcite, Irai...Serbia ¢ 11x8x7cm LEFT: Fluorite, Taihang Shan Mountains, Hebei, China * 19x13x1cm 10 | MINERALS: PRODUCTS...considered to be minerals. Microcline, Crystal Peak, Colorado, USA * 12 x 9x 5 cm. Biominerals Crystals formed...a fracture, producing such forms as aegirine pegmatite. As well, hot hydrothermal fluids often carry | | | Book | | Buffalo, New York 14205 66 Leek Crescent Richmond Hill, Ontario L4B 1H1 Design and Layout: Joseph Gisini/PageWave...139) Page 248: Quartz (amethyst variety), Erongo Mountains, Namibia * 5 x 6 x 3 cm Page 251: Calcite, Irai...Serbia ¢ tixex7 cm LEFT: Fluorite, Taihang Shan Mountains, Hebei, China * (Sexes selem 10 | MINERALS:...considered to be minerals. Microcline, Crystal Peak, Colorado, USA * 12 x 9x 5 om MINERALS: PRODUCTS OF A...a fracture, producing such forms as aegirine pegmatite. As well, hot hydrothermal fluids often carry |  | | Journal (article/letter/editorial) | | proportion of NaNbSiO5 (≤10 mol% in samples from Montana; Chakhmouradian and Mitchell 1999), and of Ta components...subsequent re-deposition of the leached elements as thorite, zirconian titanite, and Ca-Na zirconosilicates...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts., Montana. Mineralogy and Petrology, 67, 85–110 |  | | Journal (article/letter/editorial) | | nepheline syenite at Bratthagen, Norway, and Pegmatite Peak, Montana (Lumpkin et al., 1997; Chakhmouradian and...rock types include syenitic, nephelinesyenitic pegmatite, phonolite and lamprophyre dykes. The magmatic...olivine (Mg), orthoclase (K), spessartine (Mn), thorite (Th), villiaumite (F), witherite (Ba), metallic...using EDS spectrnm-stripping techniques. However, peak profiles used for the analytical X-ray lines were...peralkaline pegmatites at Gordon Butte and Pegmatite Peak in Montana (Mitchell and Chakhmouradian, submitted) |  | | Report (issue) | | ..................... 24 Regional rare-metal pegmatite zoning and lithogeochemical anomalies ................................................... 25 Pegmatite dimensions and structure .............................................................. 33 Bald Hill ........................................................................................ 99 Beryl Hill ....................................................................................... 104 Camel Hill ............................................... |  | | Book | | ians Mr. Atkins and Mrs. Brunton; Dr. or Morgan Hill, William Larson, CA; R. Fallbrook, W. Dr....always is Theophrastus Theophrastus. gazing John Hill by and J. F. Caley make it doubtful whether...gold links National Museum of Naples. McGraw Hill Book Co., After emerald The and and necklace...and for it is However, territory coincides Mountains, prehistoric turquoise,” gemstones, region...Baptiste V. J.-B. Ball 1676. 2nd ed. don: Oxford Hill, Caley, E. R., ence, on Press. 238 ed. in |
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