 | | 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) |
| 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...one. The mines at Butte in Silver Bow County and the Black Pine mine in Granite County have produced many |
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| 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...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...loparite. The mineralogy of the pegmatites from Gordon Butte, other potassic complexes, and sodic agpaitic |
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| the compositional variation from clinochlore to chamosite [0.25 < Fe/(Fe + Mg) < 0.71]. The spherulites...four transitional zones composed of alternating chamosite and clinochlore, and a rim that may be Mg- or...images showing chlorite spherulites composed of chamosite (lighter bands) and clinochlore (darker bands)...ancylite-(Ce) and calcio-ancylite-(Ce); ‡ clinochlore and chamosite; ‡‡ catapleiite and calcium catapleiite; †natrolite...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana. Mineral. Petrol. 67, 85-110. GILBERT, M.C., HELZ |
 | | Journal (article/letter/editorial) |
| close to those of the ideal chlorite endmembers, chamosite and ferrosudoite. Potassic phyllosilicates make...Prl: Pyrophyllite; Fe-Sud: ferrosudoite; Chm: Chamosite; Ann: Annite; Fe-Cel: ferroceladonite; Poly: Polylithionite...chosen to represent the sodic amphibole, and chamosite and ferrosudoite, which were chosen to represent...hematite) and Fe-phyllosilicates (ferrosudoite, chamosite 342 A.P. Gysi, A.E. Williams-Jones / Geochimica...(1998). Note daphnite, IMA acknowledged name is chamosite. b Calculated using the methods of the Chermak |
