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| Twyfelfontein 7 AiAiba / farm Anibib 136 8 Grosse Spitzkoppe, Erongo 9 , .,/, loringa tree ...Helmeringhausen 2 AiAiba 3 Rail ay station Garub near Aus Nature conservation, Erongo 16 Welwitschia...Northwest Region including Damaraland The Central Namib Desertand Escarpment The Spitzkoppen The Erongo Mountains...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits |
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| Number 2 December 1997 ISSN 1323-7640 CONTENTS Page Feature Articles: The Coolgardie pegmatite field...minerals associated with ironstones in the Olary region, South Australia P.M. Ashley, B.G. Lottermoser...South Australian M11se11111 Saddlebackite, Pb2Bi2Te 2 S3, a new mineral species from the Boddington gold...Melbourne, Victoria 300 I, Australia Tel: 61 3 9669 9892 Fax: 61: 3 9663 3669 EMail: dhenry@mov.vic.gov...90. Vol 3. No 2, December 1997 'l{ptes from the, 'Editor INDEX The Index to volume 1 & 2 is inserted |
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| Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the...isolated by means of apparatus of the GEOKhI-1960-No. 7 type; its isotopic composition was determined...- i sample) = 1. 22 x 10 -6 K%. K40( g/ - TABLE 2. Dating of minerals in standard samples from Soviet...at the Geol. Inst., Chinese Academy of Sciences. 2. Before discussing the age data so obtained, we will...will describe briefly the geology of the region under study, and the purpose of our investigation. The |
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| rareearth elements that were determined Lab. Total no. of samples La Ce Pr Nd Sm Gd Y l* 24 22.7 44.7...monazite from granites and In some examples there is no difference in from their derivative pegmatites. composition...successively crystallized zones of granitic pegmatites. 2 Compositionof monazitesfrom pegmatitesin easternMinas...interpreted in terms of the magmatic theory of pegmatite genesis. A basic premise in our inte~retation...The Emprka Caolim pegmatita (no. 1) and the Roqa Grande pegmatite (no. 2) near Juiz de Fora were studied |
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| progressive fractionation of single injections of pegmatite magmas separated in time and space.The injections...rock, except in one case where a soda-Iithia pegmatite magma was injected along the foot-rvall schist...schist contact of an earlier potash type of pegmatite. There is no evidence to indicate that any of the magmas...solutions. A later sodalithia pegmatite in contact with an earlier potash pegmatite did not replace any visible...amount of residual rvater and other volatiles u,hich no doubt are liberated as highly heated vapors or liquids |
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| Pegmatite Investigations 1942-45 New England By EUGENE N. CAMERON and OTHERS GEOLOGICAL SURVEY PROFESSIONAL...______________________________________ _ Location of pegmatite districts ___________________ _ Previous work...Acknowledgments ______________________________ _ History of pegmatite mining inN ew England _______ _ Mica mining _...deposits _______________________ _ Geology of the pegmatite districts of Maine __ :. . _____ _ Metamorphic...________________________________ _ Geology of the pegmatite districts of New Hampshire_ Rock units ______ |
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| AGE OF THE URANINITE FROM THE McLEAR PEGMATITE NEAR RICHVILLE STATION, ST. LAWRENCE COUNTY, NEW YORK...College,Northampton, M assachusetts. The Mclear pegmatite, which was discoveredin 1907, is lccated in the...property has been temporarily closed down. The pegmatite occurs in highly metamorphosedlimestone of the...In 7929the writer2 made a detailedstudy of the pegmatite but did not at that time observe the occurrence...number of specimens,on the dump from shaft number 2, containing small black mineral grains. These were |
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| Pecora, Director Library of Congress catalog-card No. OS 67-295 For sale by the Superintendent of Documents...Pine district-_____ ________________________ Pegmatite. __________________________ Geology Continued...Metamorphism. _ _ _ _ _____________ Economic aspects of pegmatite minerals . 11 12 14 14 14 15 15 16 16 16 19...minerals. ____ Uranium and rare-earth minerals. Pegmatite districts _ ______________ Jefferson-Boone district...Carolina and Tennessee. 2-6. Maps showing location of mica mines and prospects in 2. Jefferson-Boone and |
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| _-____________--_--_-__-_-_-_-__---__-_. Layers of weathered pegmatite._____________________________ Distribution of...pocket 15. Cruzeiro mica mine (Minas Gerais), No. 1 pegmatite, Toquinho workingS-___---___-_____-_-_______---_--_---In...zoning in the Borges pegmatite and segregation patches in the Levindo Alferes pegmatite, Minas Gerais___.... Projection and sketch showing relations of pegmatite, aplite, and schist at Serra dos Lourenc. os mica...Gerais-____--______ 21. Irregular contact of pegmatite and schist at lower Urubu mine, near Espera Feliz____________ |
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| ............................................. 2 2 2 3 3 GEOGRAPHIC FEATURES ............................................................... 59 59 60 61 62 63 68 68 68 69 69 Red River mining subdistrict.......................................... Victor No. 2 prospect ......................................................................... Moberg Tunnel No. 2 prospect ......................................................................................... No Agua mining district ........................... |
