 | | 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... 4r3 Garnet. Sphene. Aegirite Eudialyte.. Lamprophyllite Catapleiite.. . . 4t4 414 415 416 418 4t8...of Tertiary alkalic rocks in the Bearparv Mountains, Montana. The pegmatites occur in the field as small...and complete analyses of potash nepheline, lamprophyllite, and fibrous aegirite are presented with descriptions |  | | 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...silicates, including lamprophyllite, titanite and chevkinite-group minerals. Lamprophyllite is generally poor...[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) | | 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...only a few crystals contain a core composed of lamprophyllite. The evolutionary history of the Gordon Butte...Alkaline igneous rocks of central and western Montana (USA) exhibit great petrographic diversity, and are |  | Krivovichev, Sergey V., Armbruster, Thomas, Yakovenchuk, Viktor N., Pakhomovsky, Yakov A., Men'shikov, Yuriy P. (2003) Crystal structures of lamprophyllite-2M and lamprophyllite-2O from the Lovozero alkaline massif, Kola peninsula, Russia. European Journal of Mineralogy, 15 (4) 711-718 doi:10.1127/0935-1221/2003/0015-0711 | Journal (article/letter/editorial) | | 711-718 Crystal structures of lamprophyllite-2M and lamprophyllite-2O from the Lovozero alkaline massif...2Laboratorium Abstract: The crystals of lamprophyllite-2M and lamprophyllite-2O were found coexisting in an ...12)Σ2.00Ti3O2(Si2O7)2(OH)2. The structures of lamprophyllite-2M (C2/m, a = 19.215(5), b = 7.061(2), c =...3719(15) Å, β = 96.797(4)o, V = 723.7(4) Å3) and lamprophyllite-2O (Pnmn, a = 19.128(4), b = 7.0799(14), c...Whereas in lamprophyllite-2M, all HOH layers are in the same orientation, in lamprophyllite-2O, two adjacent |  | Filina, Maria I., Aksenov, Sergey M., Sorokhtina, Natalia V., Chukanov, Nikita V., Kononkova, Natalia N., Belakovskiy, Dmitriy I., Britvin, Sergey N., Kogarko, Lia N., Chervonnyi, Alexandr D., Rastsvetaeva, Ramiza K. (2019) The new mineral fluorbarytolamprophyllite, (Ba,Sr,K)2[(Na,Fe2+)3TiF2][Ti2(Si2O7)2O2] and chemical evolution of lamprophyllite-group minerals in agpaitic syenites of the Kola Peninsula. Mineralogy and Petrology, 113 (4) 533-553 doi:10.1007/s00710-019-00664-0 | Journal (article/letter/editorial) | | Fe2+)3TiF2] [Ti2(Si2O7)2O2] and chemical evolution of lamprophyllite-group minerals in agpaitic syenites of the...syenites containing up to 25 vol.% lamprophyllite-group minerals (lamprophyllite, fluorlamprophyllite, barytolamprophyllite...and ferripyrophyllite. Three generations of lamprophyllite-group minerals can be distinguished based on...fluorlamprophyllite. It represents the early generation of lamprophyllite-group minerals (LGM) and forms brown prismatic...University of Notre Dame, Notre Dame, IN 46556, USA 4 Institute of Problems of Chemical Physics, Russian |  | | Journal (article/letter/editorial) | | Mont SaintHilaire (Québec, Canada), and Bearpaw Mts. (Montana, USA). The present work also provides new...(as pseudomorphs after loparite), and from a pegmatite at Mt. Kuivchorr (as discrete crystals) by Semenov...Selsurt (Chakhmouradian & Sitnikova, 1999), and a pegmatite vein intersected by the Karnasurt mine (Zadov...oikocrysts of “agpaitic” silicates, i.e., murmanite, lamprophyllite and alkali amphibole (Fig. 7). In sample LV54...presence of oikocrysts of murmanite (Mur), lamprophyllite (Lam) and lueshite (white grains indicated |  | | 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) | | incompatible and volatile elements in late-magmatic, pegmatite and postmagmatic mineral parageneses. These substitutions...(2004, 2005, 2006). Astrophyllite, rinkite and lamprophyllite are orthomagmatic accessories in lujavrite...(eudialyte-II of Mitchell and Liferovich, 2006) and lamprophyllite-group minerals. FAp-Sr replaces and mantles...catapleiite-like sodic zirconosilicate(s), lamprophyllite-group minerals, acicular aegirine, stronalsite...data than using single-LREE standards. However, peak profiles used for the analytical lines were established |  | | 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...ideally NaCeSr3(PO4)3F, is known from several pegmatite bodies in northwestern and southeastern Lovozero...phonolites (Table 2). Veins of nepheline syenite pegmatite containing strontium-apatite crosscut urtites...from other localities (e.g., Bearpaw Mountains and Gordon Butte in Montana) exhibit a similar compositional |  | | Journal (article/letter/editorial) | | boundary zone of a pegmatite vein and MA MEPB37C from the core of the same pegmatite. The most abundant...designated Amph2 (Fig. 2a, b, c, d). In CE P the pegmatite, minor amounts of amphibole similar to Amph2 in...mineral) were used. Counting time was 10 to 30 s on peak (and half-time on each of the 2 background positions)...were used. Counting times varied from 13 seconds on peak and 6.5 seconds on the two background positions...contact with astrophyllite. IP Amphibole in the pegmatite sample MEPB37C is arfvedsonite of similar composition |  | 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) | | crystallization of closely associated strontium-apatite, lamprophyllite and stronalsite indicates high activities of...(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 |  | | Journal (article/letter/editorial) | | Representative compositions (wt.%) of spinels in pegmatite mica. TiO2 Al2O3 Cr2O3 FeO* MnO MgO Total Recalculated...that of lamprophyllite and barytolamprophyllite from the Gordon Butte potassic peralkaline pegmatite (Chakhmouradian... (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...B.F. (1941) Igneous rocks of the Highwood Mountains, Montana. Part 3, Dikes and related 3194 MINERALOGY |
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