 | | Journal (article/letter/editorial) | | MUSCOVITE WITH SMALL OPTIC AXIAL ANGLE* J. M. AxornoD AND F. S. Gnruaror, U. S. GeologicalSuraey...Ansrnecr Muscovite with unusual optical and structural characteristics is described. The size of the optic...about 15" for areas of highest birefringence in the cleavage plane to about 3'for areas of lowest birefringence...birefringence. X-ray studies show the musand thus dimorphous with previously covite to be three layered monoclinic...Variation in the observed optic axial angle is attributed to the coalescenceof the optical effects of superposed |  | | Report (issue) | | Beryl-bearing Pegmatites in the Ruby Mountains and Other Areas in Nevada and Northwestern Arizona By...Prepared on behalf of the U.S. Atomic Energy Commission and published with the permission of the Commission ...GOVERNMENT PRINTING OFFICE, WASHINGTON t 1960 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON,...For sale by the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. CONTENTS...---------------------Pegmatite mining in the region...________-__-__--__.______-_-_-General features of the pegmatites____ |  | | Journal (article/letter/editorial) | | PEGMATITE MINERALS OF THE UNITED STATES DAVID M. SEAMAN American Museum of Natural History, New York...is a complex silicate of boron and aluminum with either magnesium, iron, or the alkali metals prominent...tourmaline granite. The common, black, iron rich variety is known as schorl. The colored tourmalines...are rubellite, the pink or red variety; indicolite or the blue variety; achroite, the colorless or white...white variety; and the green or Brazilian emerald variety. The gem tourmalines are found most commonly |  | | Report (volume) | | UNITED STATES DEPARTMENT OF THE INTERIOR J. A. Krug, Secretary GEOLOGICAL SURVEY W. E. W rather, Director...Director Bulletin 956 GEOLOGY AND ORE DEPOSITS OF THE LIBBY QUADRANGLE, MONTANA BY RUSSELL GIBSON WITH...GOVERNMENT PRINTING OFFICE WASHINGTON : 1948 For sale by tbe Superintendent of Documents, U. S. Government...Government Printing Office, 'Washington 25, D. C. 857680 CONTENTS Abstract__ _________________________...____-___-_-_-._-.-__--___----..---__-.-.___._ 2 Purpose of the investigation....___-_.___.______--_____-_-___ |  | | Report (volume) | | Mineral Resources of the Providence Mountains Wilderness Study Area, San Bernardino County, California U...Mineral Resources of the Providence Mountains Wilderness Study Area, San Bernardino County, California By...GAPS U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1712 MINERAL RESOURCES OF WILDERNESS STUDY...CALIFORNIA DESERT CONSERVATION AREA DEPARTMENT OF THE INTERIOR DONALD PAUL MODEL, Secretary U.S. GEOLOGICAL...STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1988 For sale by the Books and Open-File Reports Section |  | | Report (volume) | | and Mineral Resources of the Hailey I°x2° Quadrangle and the Western Part of the Idaho Falls I°x2° Quadrangle...*VG}'erati(>ttaw$i the faho Geological Survey Idaffo Stat^Universitv, 'and th&Jr "ni\'ersity of Idaho U.S....Looking south at the Mackay stock, southwest of Mackay, Idaho. The Eocene Mackay stock (center of photograph;...photograph; is made up of granite, quartz monzonite, leucogranite porphyry, and felsic dike rocks. It is flanked...sedimentary rocks, including the Lower Mississippian McGowan Creek Formation and the Upper Mississippian White |  | | Report (volume) | | oa een 7 Porphyry Deposits of the Northwestern Cordillera of North Ame I a Z Oy f sS Edited by...Ministry of Energy, Mines & Petroleum Vancouver, British Columbia, Canada Published for the Geological...Geological Society of CIM as VOLUME 46 by the OF MINING, METALLURGY SPECIAL CANADIAN INSTITUTE NORTHWEST COMMUNITY...PETROLEUM COPYRIGHT © 1995 BY CANADIAN INSTITUTE OF MINING, METALLURGY AND PETROLEUM Suite 1210, 3400 de...organized into the following parts: Part A — general aspects of porphyry deposits of the northwestern Cordillera |  | MacKevett, E.M., Brew, D.A., Hawley, C.C., Huff, L.C., Smith, James G. (1971) Mineral resources of Glacier Bay National Monument, Alaska. Professional Paper 632. US Geological Survey doi:10.3133/pp632 | Report (issue) | | Mineral Resources of Glacier Bay National Monument, Alaska GEOLOGICAL SURVEY PROFESSIONAL PAPER 632...632 Mineral Resources of Glacier Bay National Monument, Alaska By E. M. MAcKEVETT, JR., DAVID A. BREW...PROFESSIONAL PAPER 632 A reconnaissance study of the mineral deposits and their geologic setting and...and a geochemical sampling program in one of our wildest, most beautiful, and most remote national monuments...ASH IN GTON : 1 97 1 UNITED STATES DEPARTMENT OF THE INTERIOR FRED J. RUSSELL, Acting Secretary GEOLOGICAL |  | | Report (issue) | | Livengood quadrangle Descripltions of the mineral occurrences shown on the accompanying igure follow. See...(1996) for a description of the information co ntent of each field in th<3 records. The data presented here...here are maintained as part of ;a statewicle database on mi nes, prospects and mineral occurrences throughout...^V^^^- j - 65" 1 47" Distribution of mineral occurrences in the Livengood 1:250, 000-scale quadrangle...This and related reports are accessible through the USGS World Wide Web site http://ardf.wr.usgs.gov |  | Brew, David A., Johnson, B.R., Grybeck, Donald, Griscom, Andrew, Barnes, D.F., Kimball, A.L., Still, J.C., Rataj, J.I. (1978) Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska. Open-File Report Vol. 1978 (78-494) US Geological Survey doi:10.3133/ofr78494 | Report (issue) | | United States Department of the Interior Geological Survey Mineral Resources of the Glacier Bay National...Kimball, Jan C. Still, and Jeanne L. Rataj, U.S. Bureau of Mines n Open-file Report 78-494 1978 This report...accordance with the provisions of the Wilderness Act 3 (Public Law 88-577, September 3, 1964) and the Joint Conference...Senate Bill 4, 88th Congress, the U.S. Geological iSurvey and U.S. Bureau of Mines have been conducting...mineral I\ jsurveys of wilderness and primitive areas. Studies and reports i ,of all primitive areas |
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