 | | Book | | not attempted to describe diamond prospecting and mining and, although I have attempted to give some of...with whose research groups at the universities of Cape Town and Chicago I have had long and fruitful collaboration...collaboration. Much of my fieldwork in southern Africa has been carried out with the cooperation and assistance...7.3 2.8 2.9 Africa . . . . . . . . . . . . . . . . . . . . . . . . . . . . West Africa . . . . . . .... . . . . Central Africa. . . . . . . . . . . . . . . . . . . . . . . East Africa. . . . . . . . . . |  | | Journal (article/letter/editorial) | | R*CKWOOD** Division of Geological Sciences, University of Cape Town 12,eceived November 4, 1969 Abstract. Brief...in the kimberlites of Lesotho, Rhodesia, Sauth Africa, and Tanzania. Six new mineral assemblages, which...ibole; garnet-spinel; garnet-clinopyroxene-quartz; garnet-clinopyroxene-high sanidine; garnet-clinop...derived. The physical properties (n and a0) of garnet from 136 peridotites and pyroxenites have indicated...(uvarovite -~ andradite). Similar measurements of garnet from 57 eclogitic rocks have enabled us to locate |  | | Journal (article/letter/editorial) | | n d Geochemistry, University of Cape Town, Rondebosch, South Africa Received May 13, 1968 Abstract. The...collection which is stored a t the University of Cape Town. E v e r y suitable sample available to the...authors has been examined. A gap in the range of garnet volume percentages occurs in the samples studied...d 30 %. Garnet peridotites characteristically have < 15 % garnet and eclogites > 30% garnet. Very rare...orthopyroxene. All b u t two of the peridotite-pyroxenite group contain orthopyroxene. The garnets from the peridotites |  | | Book (volume) | | chemical classification. Thus Bauer was able to group together gem minerals which are related chemically...found at the p. 127, line 5. Premier Mine, Transvaal, South Africa. It weighed 3106 carats in the rough...production and almost 56% of world annual production. South Africa is p. 159, line 17. ; ADDENDA Vlll (1968)...stones of smaller sizes. South Africa diamonds Congo Other large producers in Africa are is still the major...producer of stones of gem quality. Ghana, Southwest Africa, Sierra Leone, and Angola. At the present time |  | Liu, Chao, Hystad, Grethe, Golden, Joshua J., Hummer, Daniel R., Downs, Robert T., Morrison, Shaunna M., Ralph, Jolyon P., Hazen, Robert M. (2017) Chromium mineral ecology. American Mineralogist, 102 (3) 612-619 doi:10.2138/am-2017-5900 | Journal (article/letter/editorial) | | octahedral sites of many minerals (e.g., spinel, garnet, tourmaline) by substituting for Fe3+, Mg2+, Ca2+...Mammoth-Saint Anthony Mine (Mammoth-St Anthony Mine; Mammoth Mine; St. Anthony Mine), St. Anthony Deposit...Deposit, Tiger, Mammoth District, Pinal Co., Arizona, U.S.A. 3 Callenberg North Open Cut (No. 1), Callenberg...Negev, Israel 5 Red Ledge Mine, Washington, Washington District (Omega District), Nevada Co., California...Kamakusa, Mazaruni District, Guyana 7 Red Lead Mine, Dundas Mineral Field, Zeehan District, Tasmania, Australia |  | | Book | | Kimberlites are consequently of interest to a diverse group of earth scientists, ranging from isotope g~ochemists............................... 126 5.3.3.2. West Africa ........................................... 126............ .................... 6.4.3. Pyroxene-Garnet Intergrowths (Paragenesis 3) . . . . . . . . ..... . . . . . . . . . . . . 6.4.9. Orthopyroxene-Garnet Intergrowths ................................ 6...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith |  | | Book (edition) | | Minerals that are listed as belonging to the same group are similarly closely comparable in composition... Meta/lurgical and Mineralogical Society o/ South Africa Journal of Chemical Phy ics Journal cif the...and Proceedings of the Royal Socief) 1 of Ne,v South Wales JPSJ Journal of rhe Physical Society of...Mineralogia e Petrologia Program with abstract Ā·.joint 01111110/ meeting of the GAC. ,\L.J.Cand CSPG Pennskiye...Pennskiye gubemskiye wdomo.sti (Perm district ga=elle) Pl,ilosopl,ical Maga=ine Periodico de Alineralogia-Roma |  | | Book | | e SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE Cape Town, April 1998 EXTENDED ABSTRACTS All extended...responsibility for authorsā errors and omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE... De Beers Consolidated Mines SPONSORS Bateman Group (including Bateman Process Equipment, Bateman Minerals...Trans Hex Group Ltd CONTRIBUTORS Council for Geoscience (Geological Survey of South Africa) SouthemEra...Ltd SOCIETY SPONSORS Geological Society of South Africa (GSSA) The International Association of Geochemistry |  | | Book (edition) | | Albert Museum, and the Imperial Institute, all at South Kensington. Many of the examples referred to in...the British Museum of Natural History, also at South Kensington. NOTE TO SECOND EDITION A few minor..." 43 67 Geological Occurrence Stones 7^ 86 Mining of Precious Stones Forms of Cutting Cutting and... ā¢ - - 177 - - 187 ' XĀ„IIL The Quartz Group - *- - ā¢ XX." Jade (Nephrite and Jadeite) ...Abandoned Open Workings of the Kimberley Diamond Mine at Kimberley, South Africa - IV. {a) Crystal of Diamond |  | | Journal (article/letter/editorial) | | overlap with the record established from cratonic garnet peridotite xenoliths and xenocrysts but reļ¬ect...indicate polybaric melt extraction proceeding from the garnet into the spinel stability ļ¬elds, most readily explained...mineralogical layers, spinel facies (lilac) and garnet facies (purple to pink). Small volume melt fractions...inclusion-bearing diamonds from the mines of South Africa and Botswana was begun by Gurney and Harris...diamonds is not known. In early work (1973ā1985) run-of-mine diamonds in the sieve class ā6 + 5 (1.83 mm aperture |  | | Journal (article/letter/editorial) | | February 2009 Editor: R.W. Carlson Keywords: subcalcic garnet Archean mantle Kaapvaal craton LuāHf SmāNd depletion...t Twenty four subcalcic garnets from the Finsch mine (SA) were analysed for major and trace elements...were able to distinguish two groups of garnets: group-1 with low Cr# (b 11.4), which correlates negatively...negatively with CaO and positively with (Lu/Er)N and group-2 displaying high and variable Cr# (10.9ā34.3) but...ļ¬ndings imply that group-1 garnets were mainly generated by depletion in the garnet and group-2 garnets by |  | Banas, A., Stachel, T., Phillips, D., Shimizu, N., Viljoen, K.S., Harris, J.W. (2009) Ancient metasomatism recorded by ultra-depleted garnet inclusions in diamonds from DeBeers Pool, South Africa. Lithos, 112. 736-746 doi:10.1016/j.lithos.2009.04.043 | Journal (article/letter/editorial) | | recorded by ultra-depleted garnet inclusions in diamonds from DeBeers Pool, South Africa A. Banas a,ā,1, T. Stachel...Box 524, Auckland Park, 2006, Johannesburg, South Africa e Division of Earth Sciences, University of...Paleoarchean Nb anomaly a b s t r a c t Peridotitic garnet inclusions in diamonds from the DeBeers Pool mines...extremely depleted mantle source. A large number of garnet inclusions have CaO contents of less than 1.8 wt...in the protolith for the cratonic root beneath Kimberley (Kaapvaal Craton) exceeded orthopyroxene exhaustion |  | | Book | | ā_ā 1.12 ā 8 10 ā ā_ 12 14 _ ā Courtesy of F&S Group Geology and World Deposits TAO 6.30 5.60 5.00 4...and related materials Feldspar 106 Fluorspar Garnet Graphite 110 Slate Sodium sulfate 122 = 130...boundaries of the mineral industry are clear: the mining and milling of feldspar, for example, belong to...does not. But how does one draw the line between mining and manufacturing where brine from a salt well...districts, or a representative district if there are many. We name the chief mining companies, and give production |  | | Book | | Sapphire Chrysoberyl, Topaz and Spinel Beryl The Garnet Group Tourmaline and Zircon Quartz, Agate and Chalcedony...gravel C. Corundum group D. Chrysoberyl and spinel E. Beryl group F. Garnet group G. Topaz and tourmaline...tourmaline H. Zircon I. Quartz group J. Opal K. Chalcedony group L. Jade minerals M. Lapis lazuli... The āBig Holeā at Kimberley za. Underground working at Premier Diamond Mine zb. Grease tables at...Premier Mine 3. Removing the overburden covering diamondiferous gravels on coast of South West Africa II |  | | | | amphibole 100 amianthus, blue 100 -amianthus, Cape 100 amphibole group 98 annabergite 73 arduinite 119, /2/...dialogite 42, 42 diamond 5, 6 galena 12, /3 garnet group 76 garnierite 107 gaylussite SO gehlenite 85...97, 98 fayalite 75 feldspars 111 feldspathoid group 108 ferrierite 122 ferrimolybdite 63 fluoborite...119 metacinnabarite 13 meyerhofferite 54 mica group 104 mica, white 104 microcline 112, //3 millerite...102, /03 pyroxene group 96 pyrrhotite 12, /2 siberite 96 siderite 42 silica group 31 silicates 75 sillimanite |  | | Book | | 100 amianthus, blue 100 _amianthus, Cape 100. amphibole group 98 analcite 76, 108, 111 anatase 34,...coquimbite 60 cordierite 95 galena 12, 13 garnet group 76 garnierite 107 gaylussite 50 gehlenite...eye 31 fayalite 75 feldspars 111 feldspathoid group 108 ferrierite 122 ferrimolybdite 63 fluoborite...119 metacinnabarite 13 meyerhofferite 54 mica group 104 mica, white 104 microcline 112, /13 millerite...pyrolusite 34 pyrope 76 pyrophyllite 102, 103 pyroxene group 96 pyrrhotite 12, /2 quartz 28, 31, 95 nepheline |  | | Book (volume) | | productive, especially Edinburgh, Oxford and along the south terms alley, bibliography project large card-file...diamonds in South Anthony Trollopeās South Africa over rings ence are include Africa, and others...archeol archeology, archeologisch(e, es) Afr Africa art,-s artides, AK Alaska assoc assodatc...foreword feet DBI Dizionario dbl double FY DC District of Columbia G, DE Delaware GA Georgia dec...Michigan mimeo mimeograph,-ed,-ic ie that is min mining IL Illinois mineral mineralogical, mineralogisch |  | | Book | | crystallographers, geologists, petrologists, geochemists, mining engineers, mineral assayers, curators, collectors...chemist and mineralogist; student of Torbern Bergman; mine owner and mineral analyst; trained J. J. Berzelius...Louis Cordier (1777-1861), French geologist and mining engineer; student of Haiiy; helped enlarge the...identified as scientists, or related to mineral mining, collecting, or exploration, there are some cases...prehnite, Colonel Hendrik von Prehn, of Cape Town, South Africa. samarskite, Colonel V. E. von Samarski-Bykhovets | | | Book | | 100 arnianthus, blue 100 ...amianthus, Cape 100 amphibole group 98 analcite 76, 108, I 11 anatase 34,...fassaite 97, 98 fayalite 75 feldspars 111 feldspathoid group I08 ferrierite 122 ferrimolybdite 63 fluoborite...gadolinite 85 gahnite 24 galaxite 24 galena 12, 13 garnet group 76 garnierite 107 gaylussite 50 gehlenite 85...mesotype 119 metacinnabarite 13 meyerhofferite 54 mica group 104 mica, white 104 microcline 112, 113 miJlerite...68, 68 pyrope 76 pyrophyllite 102, 103 pyroxene group 96 pyrrhotite 12, 12 quartz 28, 31, 95 quartz, amethyst |  | | Book (volume) | | LONDON: AFRICA : & CO. (PUBLISHERS) LTD. 88 Kingsway, W.C.2 BUTTERWORTH & CO. (AFRICA) LTD. DURBAN...Other Feldspar Gemstones 10 Gems of the Silica Group including Amethyst, Agate and Opal 11 Turquoise...Peridot: Crystal and Cut Stones : 96 ā ; : Garnet: Crystal and Cut Stones of Pyrope, Hessonite, Demantoid...2 PREFACE For two decades, an earlier work of mineāPractical Gemmologyāhas proved a useful elementary...some reason, the stones are better placed in a group form- | ing a small subchapter. In the technical |  | | Book (edition) | | red spinel, Ceylon; 3, garnet, (almandite), India; 4, garnet (pyrope), Africa. GEMS AND GEM MATERIALS...Michigan. The course has annually attracted a sizable group of students. The aim of the course is to give...first kingdom. With a more intensive study of that group of organisms, zoology was developed, and with it...variation in the chemical composition; see the garnet group (p. 208). The phrase āusually possessing a definite...a number of gems are popular locally in the district in which they occur. This constitutes another |  | | Book | | Diamond, the Star of India, and the Star of the South, to their use in family heir- looms, personal...their uncut shapes, and final settings, their mining and polishing. A glossary of technical terms gives...Spring Chrysoberyl: The Three Dissimilar Brothers Garnet and Its Paladins Moonstone: Child of the Dawning...fluorite, belong chiefly the varieties of the quartz group: amethyst, rock crystal, smoky quartz, and citrine...the metamorphic cycle, which included the large group of the crystalline schists. They originated from |  | | Report (issue) | | Kimberlites, held at the Geological Society of America South-Central Section meeting, Apr. 15-16, 1985, Fayetteville...Dill, 1952ā III. Geological Society of America. South-Central Section. IV. Symposium on Alkalic Rocks...lamprophyres and related rocks from Westland and Otago, South Island, New Zealand . Barbara A. Barreiro and Alan...Kimberlites, held at the Geological Society of America South-Central Section meeting, April 15-16, 1985, in Fayetteville...Science Foundation (Grant EAR 8500390) and the South-Central Section of the Geological Society of America |  | | Book (edition) | | DEPOSITS AND PRODUCTION OF GEMS Types of deposits 49 Mining methods 51 54 CUTTING AND POLISHING OF GEMS Engraving...GEMSTONES Diamond 70 Spodumene 114 Ruby 82 Quartz group 116 Sapphire 86 Jade 154 Emerald 90 Peridot 158...Feldspar group t 64 Spine! 100 Rhodochrosite, Rhodonite 168 Topaz 102 Turquoise 170 Garnet 104 Lap is...first known were amethyst, rock crystal, an1ber, garnet, jade, jasper, coral, lapis lazuli, pearl, serpentine...tanzanite (blue zois1te) and tsavorite (green grossuJar garnet). In order to correct this state of affairs and |  | | Report (issue) | | \ \I Cover: The De Wet Shaft, Tsumeb mine (photograph by Dr Gabi Schneider, Geological Survey of Namibia)...Geological Survey P.O. Box 2168, Windhoek, Namibia Price Local (+GST) Abroad (Post Free) R20.00 R25.00 ISBN 0-86976-254-0...the most prolific source JoiĀ· type mineĀ rals in Africa. The nearby Kombat deposit is the second richest...has the largest assemblage of type minerals in Africa and is acknowledged as one of the classic mineral...As-tsumebite La-florencite Buszite Manganese-iron garnet (Cadmocite) Mg-riebeckite (Cufegesulite) Paraurichalcite-1 |
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