 | | Journal (article/letter/editorial) | | PO Box 524, Auckland Park 2006 Johannesburg, South Africa brucec@uj.ac.za Figure 1. Bultfonteinite on...view 11 cm, from the Dutoitspan mine. Although not from Bultfontein mine, this specimen is historically...donated by C. E. Adams to the MacGregor Museum in Kimberley. The color and habit of this Dutoitspan bultfonteinite...evidenced from a specimen attributed to the Bultfontein mine by Irocks.com (www.irocks.com/ minerals/specimen/3705;...Bultfonteinite Bultfontein Diamond Mine Kimberley, South Africa B ultfonteinite, Ca2[SiO3(OH)]F·H2O |  | | Journal (article/letter/editorial) | | PP. 75 8 Further data on the occurrence o f pectolite in kimberlite BARBARA H. SCOTT SMITH* Anglo American...Mines 2025, South Africa AND E. MICHAEL SKINNER AND C, ROGER CLEMENT Geology Department, De Beers Consolidated...Consolidated Mines Ltd., PO Box 47, Kimberley 8300, South Africa ABSTRACT. Pectolite has been identified, using...from the De Beers and Dutoitspan Mines, Kimberley, South Africa and the Letseng-La-Terai Mine, Lesotho...kimberlite. It is concluded that this mineral is pectolite, the same mineral as that discussed by Kruger |  | HANSON, E.K., MOORE, J.M., BORDY, E.M., MARSH, J.S., HOWARTH, G., ROBEY, J.V.A. (2009) CRETACEOUS EROSION IN CENTRAL SOUTH AFRICA: EVIDENCE FROM UPPER-CRUSTAL XENOLITHS IN KIMBERLITE DIATREMES. South African Journal of Geology, 112 (2) 125-140 doi:10.2113/gssajg.112.2.125 | Journal (article/letter/editorial) | | A. ROBEY 125 CRETACEOUS EROSION IN CENTRAL SOUTH AFRICA: EVIDENCE FROM UPPER-CRUSTAL XENOLITHS IN KIMBERLITE...Rhodes University, P.O. Box 94, Grahamstown, South Africa email: emilykhanson@gmail.com; j.moore@ru.ac...ac.za J.V.A. ROBEY De Beers Group Services, P.O. Box 47, Kimberley, South Africa email: jock.robey@debeersgroup...robey@debeersgroup.com © 2009 June Geological Society of South Africa ABSTRACT Twelve Group II and fourteen Group...Group I kimberlite diatremes in central South Africa were examined for upper crustal xenoliths in order to |  | Hetman, C.M., Scott Smith, B.H., Paul, J.L., Winter, F. (2004) Geology of the Gahcho KuĂ© kimberlite pipes, NWT, Canada: root to diatreme magmatic transition zones. Lithos, 76 (1) 51-74 doi:10.1016/j.lithos.2004.03.051 | Journal (article/letter/editorial) | | H. Scott Smith b, J.L. Paul c, F. Winter d a De Beers Canada Kimberlite Petrology Unit, One William...Canada c De Beers Canada Exploration Inc., Canada d De Beers Geoscience Centre, South Africa Received...to those of the classic South African pipes, particularly those of the Kimberley area. Similar intrusive...that of many other pipes in Canada such as at Lac de Gras, Fort aÌ la Corne or Attawapiskat. D 2004 Elsevier...1). The variations are attributed to different local country rock geology and emplacement processes (Field |  | | Journal (article/letter/editorial) | | TufïŹsitic kimberlites from the Wesselton Mine, South Africa: Mineralogical characteristics relevant to...Geology, Rhodes University, Grahamstown 6140, South Africa Scott-Smith Petrology Inc., 2555 Edgemont Blvd...r a c t TufïŹsitic kimberlites from the Wesselton Mine consist, in order of formation, of the following...these rocks. We have chosen the Wesselton Mine (South Africa) as the âtype localityâ for âtufïŹsitic kimberliteâ...so-called KIMFIK pipes (a collective term for De Beers, Wesselton, Dutoitspan, Bultfontein, Finsch, and |  | | Journal (article/letter/editorial) | | correction and discussion of the occurrence of pectolite IN a previous report (Kruger, 1980) I described...Letseng-La-Terae kimberlite in Lesotho and the De Beers mine in Kimberley. I concluded the mineral was ceboilite...close fit of the diffraction data is provided by pectolite [NaCa2 Si3Os(OH)] (JCPDS card no. 12-238). The...as the intensities correspond better. However, pectolite has inclined extinction (Deer et al., 1978) and...has parallel extinction and is thus unusual for pectolite. Nevertheless the bulk of the available data including |  | Giuliani, A., Phillips, D., Fiorentini, M.L., Kendrick, M.A., Maas, R., Wing, B.A., Woodhead, J.D., Bui, T.H., Kamenetsky, V.S. (2013) Mantle oddities: A sulphate fluid preserved in a MARID xenolith from the Bultfontein kimberlite (Kimberley, South Africa) Earth and Planetary Science Letters, 376. 74-86 doi:10.1016/j.epsl.2013.06.028 | Journal (article/letter/editorial) | | xenolith from the Bultfontein kimberlite (Kimberley, South Africa) A. Giuliani a,â , D. Phillips a , M.L...(SrSO4 ), clinopyroxene and minor phlogopite, pectolite, sphene, apatite, barite (BaSO4 ) and CaâSr carbonates...sampled by the Bultfontein kimberlite (Kimberley, South Africa). This assemblage occurs in veins that...spectrometric analyses of crushed mantle xenoliths from south-eastern Australia, which showed the release of SO2...abundant clinopyroxene and minor sphene, apatite, pectolite, phlogopite, barite and carbonates, in a mantle |  | | Book (volume) | | ALPHEUS F. WILLIAMS, B.Sc. GENERAL MANAGER OF DE BEERS CONSOLIDATED J\llNES1 LIMITED VOL. I. I ERNEST...rise and development of the diamond mines of South Africa, from an historical, economic and technical...an historical account of the development of the De Beers group of diamond mines, together with an account...days on the diamond fields when the mines in the Kimberley and Jagersfontein areas were the only diamond...collect during my many visits to all parts of South Africa where kimberlite deposits occurred and the filing |  | | Journal (article/letter/editorial) | | com/locate/lithos Kimberlites of the Man craton, West Africa E.M.W. Skinner a,*, D.B. Apter b, C. Morelli b...Rhodes University, Grahamstown 6140, South Africa b DeBeers, South Africa c Mano River Resources, Canada Received...craton in West Africa is an Archaean craton formerly joined to the Guyana craton (South America) that...Introduction The kimberlites of the Man craton West Africa (Fig. 1) include concentrations of kimberlites...similarly aged Group II kimberlites in Southern Africa (Skinner et al., 1992). A hot spot model for these |  | Kjarsgaard, B.A., Pearson, D.G., Tappe, S., Nowell, G.M., Dowall, D.P. (2009) Geochemistry of hypabyssal kimberlites from Lac de Gras, Canada: Comparisons to a global database and applications to the parent magma problem. Lithos, 112. 236-248 doi:10.1016/j.lithos.2009.06.001 | Journal (article/letter/editorial) | | Geochemistry of hypabyssal kimberlites from Lac de Gras, Canada: Comparisons to a global database and...Canada K1A 0E8 Earth Sciences, Durham University, South Road, Durham, DH1 3LE, United Kingdom Earth and...geochemical analyses of hypabyssal kimberlite from the Lac de Gras ïŹeld. Screens using Yb versus Al2O3 and ln Si/Al...contents of peridotite contamination. We utilize the Lac de Gras data suite to calculate, by two different methods...geochemically distinct parent magma types. The Lac de Gras parent magma compositions are compared to those |  | Dalton, Hayden, Giuliani, Andrea, O'Brien, Hugh, Phillips, David, Hergt, Janet (2020) The role of lithospheric heterogeneity on the composition of kimberlite magmas from a single field: The case of Kaavi-Kuopio, Finland. Lithos, 354. 105333 doi:10.1016/j.lithos.2019.105333 | Journal (article/letter/editorial) | | kimberlites of a single cluster and field (e.g., Lac de Gras), the Kaavi-Kuopio al kimberlites appear to...kimberlite clusters (e.g., Kimberley, South Africa) and fields (i.e. Lac de Gras, oo f Canada) which...event is represented by the Kuusamo cluster in northern Finland (Fig. 1) and consists of seven evolved...clinopyroxene, radiating aggregates of fibrous pectolite (e.g., Fig. 3B; Supp.Fig. S3F,S4C; see Journal...kimberlites from Lac de Gras (up to 7 ÎNNO units, Canil and Bellis, 2007) and recently in the South African Premier |  | | Journal (article/letter/editorial) | | Cambrian Gahcho Kue kimberlite cluster (Slave craton, northern Canada). This Group-IA kimberlite is a multiphase...Occasional samples with diopside ± melilite may reflect local heterogeneities in the bulk composition or separate...rocktype, it also varies significantly in response to local chemical heterogeneities and to the composition...variability in phlogopite compositions is due to very local diffusion-controlled crystallization, and not to...evidence of contamination by host granitic rocks. Pectolite, diopside, melilite and phlogopite have replaced |  | | Book | | Project of Energy, Mines, and Resources, Canada; and De Beers Consolidated Mines are acknowledged for financial............................... 126 5.3.3.2. West Africa ........................................... 126...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith............................................... Pectolite . . . . . . . . . . . . . . . . . . . . . . ........................... 437 KIMBERLITES Ex Africa semper aliquid novi. Pliny The Elder, Natural |  | | Report (issue) | | SURVEY OF SOUTH AFRICA COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA MINERALOGY OF SOUTH AFRICA:... COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA Scientific Editor R.D. Dixon Linguistic and...Council for Geoscience (Geological Survey of South Africa), 280 Pretoria Street, Silverton, Pretoria or........................... 69 5.1 Overview of South African Occurrences ..............................LAYEREDSUITE,BUSHVELDCOMPLEX.... 111 MINERALOGY OF SOUTH AFRICA: TYPE-MINERAL SPECIES AND TYPE-MINERAL NAMES |  | Smith, C.B., Sims, K., Chimuka, L., Duffin, A., Beard, A.D., Townend, R. (2004) Kimberlite metasomatism at Murowa and Sese pipes, Zimbabwe. Lithos, 76 (1) 219-232 doi:10.1016/j.lithos.2004.03.009 | Journal (article/letter/editorial) | | Eglin Road, Sunninghill 2157, Johannesburg, South Africa c Rio Tinto Zimbabwe Ltd., 1 Kenilworth Rd,...most northerly of these bodies being some 70 km south southeast of Sese. Although metasomatism accompanying...2.5 Ga (Fedo et al., 1995) which outcrop to the south of Murowa and extend as far as Sese. A later dolerite...profile by more recent erosion. Buhwa Mountain, 12 km south of Murowa and formed of banded ironstone, lies more...occasionally recorded from kimberlites elsewhere in Africa. Other mantle-tapping alkaline lamprophyres around |  | | Book | | carat in ten thousand emerald crys- taken from a mine in North Carolina was transparent. In some respects...carats. Its weight (Plate XVI.) The " Star of the South" was found July, 1853, in the western part of Minas...ÂŁ80,000. The " Star of South Africa" was the first large stone found in the Cape (1869). It weighed in...and nine and one-fourth carats came from the same mine. It is said an illicit diamond buyer bought this...where known. It the " Victoria" came from the Cape to was found is unEurope in 1884, and PRECIOUS |  | | Journal (article/letter/editorial) | | Seghedi a,b,â, D. Maicher a, S. Kurszlaukis a a b De Beers Canada Exploration Inc., Suite 300, 65 Overlea...root zone. A variable, often high abundance of local wall-rock xenoliths between and within the kimberlite...eruption. Fig. 2. Side view looking north (a) and south (b) of the 3D simpliïŹed geological model of the...large granite block (pink shaded) at depth, looking south (c). (For interpretation of the references to color...roundness suggests recycling processes (197 m depth, northern part of the pipe). e. TKt2 breccia including different |  | | Journal (article/letter/editorial) | | discovery iiiadr in 1897 by F. IZirsteii of the I)e Beers Coiiipaiiy, that of all the heavy constitueiits...over the second tableâ (âThe Dialnolid Mines of South Africa,â 1902, p. 380.) J. Stewart reports further...1,211,552 carats of diamonds recovered a t the De Beers Companyâs pulsator all hut 1,249 carats were caught...the Royal Society of South Africa. parcel of dianioiids from the Wesselton Mine yellow ground was handed...tables were iiot thought of in the early days of Kimberley wheu nothing but yellow ground was being worked |  | | Journal (article/letter/editorial) | | where the crystallization of spinel affects the local environment ahead of the growing spinel crystal...zoning and also on atoll-spinel formation. Very local conditions such as nucleation, or lack of nucleation...hydrous and carbonate minerals such as serpentine, pectolite, calcite and dolomite become stable phases. A...perovskite, monticellite, apatite, calcite, dolomite, pectolite and serpentine. Some kimberlites contain laths...in the crystals therefore may be due to a very local effect caused by depletion of chromium in the immediate |  | | Journal (issue) | | Treasures of the Spanish Galleon Nuestra Seiiora de Atocha Robert E. IZane, Robert C. IZammerling, Rhyna...Range, Northern Territory, Australia Maxwell J Faulkner and lames E. Shigley Blue Pectolite from the...treasurers b~oughtup from the sunken Nuestra Senora de Atocha during the past decade. It had been in its...GOLD TREASURES OF THE SPANISH GALLEON NUESTRA SENORA DE ATOCHA By Robert E. Kane, R o b e r t C. K a m m...remains of the sunken Spanish galleons Nuestra Senora de Atocha and Santa Margarita. Not only did they find |  | | Journal (article/letter/editorial) | | Territories, Canada. Sommaire La kimberlite cambrienne de Snap Lake, situĂ©e dans les Territoires du Nord-Ouest...au Canada, constitue un rare exemple dâun gisement de kimberlite diamantifĂšre filonien Ă©conomique, presque...monticellite; elle contient une faible proportion de brĂšches kimberlitiques. La kimberlite contient une...une olivine serpentinisĂ©e dans une matrice de monticellite serpentinisĂ©e, serpentine, phlogopite, dolomite...apatite, rutile et ilmĂ©nite. La composition de la kimberlite de Snap Lake ressemble, dans ses Ă©lĂ©ments majeurs |  | | Journal (issue) | | Mining of Diamonds Off the West Coast of Southern Africa John 1. Gurney, Alfred A. Levinson, and H . Stuart...Stuart Smith Sunstone Labradorite from the Ponderosa Mine, Oregon Christopher L. Johnston, Mickey E. Gunter...been identified off the western coast of southern Africa. The lead article in this issue examines the probable...diamonds exists off the west coast of southern Africa. Over the course of millions of years, many diamond-bearing...Gsocftemsfry, Universityof c47e Town, flOrtdabOSCh, Soufft Africa. and ateo Chairman ofBenguela ConcessionsPm).~ |  | Kurszlaukis, S., Mahotkin, I., Rotman, A.Y., Kolesnikov, G.V., Makovchuk, I.V. (2009) Syn- and post-eruptive volcanic processes in the Yubileinaya kimberlite pipe, Yakutia, Russia, and implications for the emplacement of South African-style kimberlite pipes. Lithos, 112. 579-591 doi:10.1016/j.lithos.2009.05.016 | Journal (article/letter/editorial) | | Russia, and implications for the emplacement of South African-style kimberlite pipes S. Kurszlaukis a...b c De Beers Canada Inc., 65 Overlea Boulevard, Suite 300, Toronto, ON, Canada M4H 1P1 De Beers, Moscow...core. It is equivalent to TufïŹsitic Kimberlite in South African pipes and thought to be related to the main...sediments. It has all features typical of large South African-style pipes and much can be learned from...579â591 complex exposed in the Yubileinaya kimberlite mine (Yakutia). Outcrops in the open pit as well as two |  | | Journal (issue) | | fully aware that, through GedG, it is indeed the de facto arbiter of gem terminology in the U.S. Now...orthoclase a n d oligoclase sunstone \pedra d e sol, literally "stone of the sun," is the Portuguese...Galvio B.F.R. Lrans, (1899)Colnpendio de Minerfllogifl por A. de hematite; where green spangles are present...Labradorite of the Greelz term.] from the Poiiderosa Mine! Oregon," seems to be that The famous Russian niineralogist...equipnlent! as well as destructive sample preparation (de Jau,1985; Kahn et al.! 1981; Demortier! 1984).To |  | Giuliani, A., Kamenetsky, V.S., Kendrick, M.A., Phillips, D., Wyatt, B.A., Maas, R. (2013) Oxide, sulphide and carbonate minerals in a mantle polymict breccia: Metasomatism by proto-kimberlite magmas, and relationship to the kimberlite megacrystic suite. Chemical Geology, 353. 4-18 doi:10.1016/j.chemgeo.2012.09.025 | Journal (article/letter/editorial) | | breccia (DU-1) from the Bultfontein Dumps (Kimberley, South Africa). Xenolith DU-1 contains heterogeneous...isotope values (initial ΔHf =2.1â3.0) in the range of South African Group I kimberlites and associated megacrysts...1973; Gurney et al., 1979; Harte and Gurney, 1981; De Bruin, 2005). Radiogenic (SrâNdâHf) isotope systematics...collected from the Bultfontein Dumps (Kimberley, South Africa). Textural relationships, mineral inclusion...collected from the Bultfontein Dumps (Kimberley, South Africa). The Bultfontein Dumps comprise waste |
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