| | Journal (article/letter/editorial) | Zr-rich alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic...Springer-Verlag 2002 Abstract At Gordon Butte (Crazy Mountains, Montana), agpaitic nepheline±syenite pegmatites...``pockets'' ®lled with calcite, ¯uorapatite, mangan-neptunite, Mn±Ti-enriched prismatic aegirine, calcium catapleiite...overall evolutionary trend of clinopyroxene in the Gordon Butte rocks is from Fe-poor diopside to aegirine±augite...lamprophyllite. The evolutionary history of the Gordon Butte pegmatites can be subdivided into primary, agpaitic | | | 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...assemblages from the Gordon Butte area, northern Crazy Mountains. At Gordon Butte, four major intrusive...nepheline-syenite pegmatites from the Crazy Mountains (Montana) intermediate zone containing randomly oriented | | | Journal (article/letter/editorial) | associated with murmanite, steenstrupine-(Ce), mangan-neptunite, and other minerals characteristic of hyperagpaitic...localities (e.g., Bearpaw Mountains and Gordon Butte in Montana) exhibit a similar compositional trend... Inagli, Ilímaussaq, Bearpaw Mountains. and Gordon Butte (Rønsbo 1989, Pekov et al. 1995, Khomyakov 1995...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana. Mineral. Petrol. 67, 85-110. 3/28/02, 16:23 ...Zrrich alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): Comparisons between potassic | | | Journal (article/letter/editorial) | 1; Mitchell and Vladykin, 1996) and from Gordon Butte, Montana (Chakhmouradian and Mitchell, 2002; not...Zr-rich alkaline pegmatites from Gordon Butte, Crazy Mountains, Montana, (USA): comparisons between potassic...K., 1977. The natural occurrence of aegirine–neptunite solid solution. Contrib. Mineral. Petrol. 60, |
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