 | | Journal (article/letter/editorial) | | SYENITE PEGMATITES, ROCKY BOY STOCK, BEARPAW MOUNTAINS, MONTANA Wrlrteu T. Pncone, Geologi.cal Survey...Segregation pegmatites Lens-shaped pegmatites. Pegmatite dikes 40r 402 403 408 408 409 409 409 Pegmatitic...dikelets.. Aplitic syenite. DescriptiveMineralogy Sanidine Nepheline. Sodalite. . . 4ll 413 4t3 Biotite...of Tertiary alkalic rocks in the Bearparv Mountains, Montana. The pegmatites occur in the field as small...square miles. Two partial chemical analyses of sanidine, and complete analyses of potash nepheline, lamprophyllite |  | | 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...The potassium feldspar corresponds to Ba-rich sanidine with relatively low Na contents. The nepheline...re-equilibration of this mineral. The association of sanidine with nearly stoichiometric nepheline is unusual |  | | 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) | | 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...Bandelier Tuff, Jemez Mountains, New Mexico, where it is associated with quartz, sanidine, plagioclase, ferroaugite |  | | 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...[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...Nb-reicher Mineralien aus. In den Proben von Pegmatite Peak sind drei Hauptphasen in der Entwicklung der |  | | Journal (article/letter/editorial) | | (1967) described syenite clasts composed mainly of sanidine, quartz, arfvedsonite, aegirine, fayalite, astrophyllite...syenites with miarolitic cavities and homogeneous sanidine; (2) dense, altered syenites, lacking void spaces...syenite pegmatites from Gordon Butte, Crazy Mountains (Montana, USA). They suggested that leaching of Na from...comprise: (1) an early crystallization stage, when sanidine (and its inclusions) nucleated and commenced growth;...growth; (2) the main growth stage of the sanidine; and (3) a late crystallization stage when the residual |  | 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 |  | 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...Na–albite, Si and Ca–titanite, Fe– andradite, K and Al–sanidine, Mg–MgAl2O4, Ba–baryte, P–apatite, Mn– spessartine...features were observed at the contact with the host pegmatite (Fig. 2a and b). The very fine-grained margin shows...by medium-grained, mineralogically primitive pegmatite intruded by the very fine-grained border zone facies |  | | Journal (article/letter/editorial) | | 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...counting time was 10 s peak and 10 s background except for Ce, La, Ba (20 s peak and 20 s background),... and Na and F (30 s peak and 30 s background). The acquisition method used was two background measurements |  | | Journal (article/letter/editorial) | | as a lamproite on the basis of the presence of sanidine and richterite. Our study was unable to verify...Representative compositions (wt.%) of spinels in pegmatite mica. TiO2 Al2O3 Cr2O3 FeO* MnO MgO Total Recalculated...barytolamprophyllite from the Gordon Butte potassic peralkaline pegmatite (Chakhmouradian and Mitchell, 2002). 3191 GURMEET... (9) The sequence of crystallization for the pegmatite veins is: mica-II (low Al-type), apatite, Ti-magnetite...at Gordon Butte, Montana (Chakhmouradian and Mitchell, 2002) or Haystack Butte, Montana (Buie, 1941; Wendlandt |  | | 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) | | the absence of typomorphic minerals (leucite, sanidine, richterite) of the lamproite clan. Introduction...Strontium-bearing apatite from common syenitic rocks in Montana and Russia (Chang et al., 1996) plots near the...orangeite of common lamproitic phases such as leucite, sanidine, shcherbakovite, and K±Ti richterite. The suite...nepheline-syenite pegmatites at pegmatite Peak, Bearpaw Mts, Montana. Mineral Petrol 67: 85±110 Chakmouradian...experiments on an SiO2-rich lamproite from Smoky Butte, Montana: derivation of siliceous lamproite magmas from |
|
