 | | Journal (issue) | | from the GachalĂĄ mine, GuaviĂł-GuatĂ©que mining district, BoyacĂĄ Department, Colombia. Gail & Jim Spann...Spann collection; Tom Spann photo. Fluorite with quartz, 11 cm, from Fujian Province, China. Keith & Diane...cm, from Stak Nala, Haramosh Mountains, Skardu district, Gilgit-Baltistan, Pakistan. Zach Goodman collection;...Kevorkian collection; Jordan Root photo. Fluorite on quartz, 13 cm, from the Yaogangxian mine, Chenzhou Prefecture...what I found was chert with occasional well-formed quartz crystals. I had an insatiable curiosity to know |  | | Journal (issue) | | Jason New Jean des ReviĂšres Pinal Geology Museum John Ebner George & Deborah Polman Flagg Mineral Foundation...Lawrence E. Violett Harris Kominski Chris Whitney-Smith John Lucking Bill Williams Maggie Lyons Wendell Wilson...sent it to my Representative, Mark Finchem (R-District 11, Oro Valley), asking him to be the primary...Jennifer Campbell, Maggie Lyons, David Tibbits, John Tibbits, and Alexander Schauss. Chris Whitney-Smith...University of Arizona, I quickly discovered that Dr. John Anthonyâs mineralogy and crystallography classes |  | | Journal (issue) | | Photography by Jeff Scovil, Gerald Pauley, John Chapman, Stuart Humphreys, John Fields, Craig Bosel, Michael Stott...level, Zinc Corporation mine, Broken Hill, New South Wales, Australia. Collection of the Australian Museum;...Museum; ex Albert Chapman collection; John Fields photo. Back cover: Australian Gold: Top row from left:...Kalgoorlie, Western Australia; Lee Spencer collection, John Chapman photo. âą 2.5 cm, Top Camp mine, Western...Family collection; John Chapman photo. âą 1.4 cm, Chapmanâs Gully, South Australia. South Australian Museum |  | | Show/Event (guide) | | Tucson, AZ 85705 in the center of the Mineral District. The mineralogy section of the mim today hosts...Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania. 14.5 x 5.5 x 3.5 cm...specimen. James Elliott photo 10 Fluorite and quartz, 21 cm aross, Planggenstock, Göschenenalp, Kanton...VĂ€yrynenite. Lolu Dahku mine, Roundu Valley, Skardu District, Gilgit-Baltistan, Pakistan. 14.5 x 3 x 2 cm,...Urandu mine, Shigar Valley, Shigar District, Gilgit-Baltistan (Northern Areas), Pakistan, 4.5 x 2 x 1 cm |  | | Journal (article/letter/editorial) | | 960-1004 Precambrian Iron-Formations of Southern Africa N.J. BEUKES Abstract From existing information...1966) and Ierru#inous SOUTHERN Africa is definedas that part of Africa sedimentary rockslessthan 15 percentiron...percentiron. In this southof approximately16Ăž south-latitude and in- paper,the 15 percentboundaryis not...contentbecauseof a generallack of chemicalanalyses. South West Africa, and Mozambique. This rela(2) Iron-formationis...commonlithologic detailedstudyon iron-formation in southern Africa variety of iron-formationand consistsof chert mesoare |  | | Journal (issue) | | Rhodochrosite, 2.5 cm, from the NâChwaning I mine, Kuruman, South Africa. Bottom right: Mimetite, 2.7 cm, from the... Namibia. (9) Shigaite, NâChwaning II mine, South Africa. v This special supplement was funded entirely...place to do so was at a mineral show, and as small local mineral clubs began to appear across the country...The California Federation Show (representing 25 local societies) in 1940 had an award for best âLoose...This case shows his sub-collections of calcite, quartz, pyrite and hematite, one species per shelf. Wilson |  | | Journal (volume) | | Banded Iron Formation-Hosted Hematite Ore Deposits John G. McLellan and Nicholas H. S. Oliver 185 Part...Warren Thorne, Steffen Hagemann, Adam Webb, and John Clout v 197 Chapter 9: The Itabirites of the...Approach to the Sishen South Iron Ore Deposit, Northern Cape Province, South Africa, and Its Implication...Deposit, Simandou Range, Republic of Guinea, West Africa I. L. Cope, J. J. Wilkinson, A. J. Boyce, J. B...ore exploration project in the Northern Cape province of South Africa. He completed his B.Sc. (Hons) |  | | Catalog/List | | WINTER 2021 4461_txt.indd 5 5 1/18/21 11:02 AM Quartz and Hematite Jinlong Iron Mine, Longchuan, Guangdong... 4461_txt.indd 8 1/18/21 11:02 AM Malachite on Quartz with Shattuckite Omaue Mine, Opuwo Rural, Kunene...11:02 AM Aquamarine with Schorl and Quartz Shengus, Roundu District, Gilgit-Baltistan, Pakistan 7.6 cm...surrounded by lustrous black tourmalines and clear quartz crystals. It is rare to have these three species...14 1/18/21 11:02 AM Rubellite Tourmaline on Quartz Malkhan Pegmatite Field, Krasnyi Chikoy, Zabaykalsky |  | | Journal (article/letter/editorial) | | Transvaal carbonate platform, Kaapvaal Craton, South Africa Dawn Y. Sumner Department of Geology, University...Park, 2000 South Africa e-mail: njb@na.rau.ac.za © 2006 March Geological Society of South Africa ABSTRACT...ABSTRACT The ~2.67 to ~2.46 Ga lower Transvaal Supergroup, South Africa, consists of a mixed siliciclastic-carbonate...the Kaapvaal Craton during extrusion of the ~2.7 Ga Ventersdorp lavas. Although depositional patterns...the observed thermal subsidence from ~2.7 to ~2.45 Ga if the thermal diffusivity of the craton was moderately |  | | Journal (article/letter/editorial) | | Stellenbosch, Stellenbosch 7600, Republic of South Africa (Received September 27, 1989; revised and accepted...Uitkoms cataclasite of pre-Makganyene age ( > 2.24 Ga) on the craton, and interpreted as a bedding-parallel...pre-date the Westerberg dyke-sheet intrusion. D 3 south-verging folds and thrusts are the oldest post-Matsap...post-Matsap deformations, just less than 2.07-1.88 Ga. D4 are upright to east vergent and N-S-trending folds...along the rim of the craton and occurred around 1.0 Ga. Multiple folding and thrusting with riebeckite mobilization |  | | Journal (article/letter/editorial) | | Lime Limited, Private Bag, 8410 Lime Acres, South Africa Received: 8 July 1994/Accepted: 9 December 1994...m). There, the largest limestone deposits of South Africa are located. The deposit at Lime Acres and mining...early Proterozoic, the Kaapvaal craton of southern Africa hosted three major sub-basins, in which clastic...Province of South Africa, the Griqualand West basin in the northern Cape Province of South Africa, and the...each lies unconformably on the approximately 2.7 Ga old Ventersdorp Supergroup (Armstrong et al., 1991) |  | Tsikos, H., Beukes, N. J., Moore, J. M., Harris, C. (2003) Deposition, Diagenesis, and Secondary Enrichment of Metals inthe Paleoproterozoic Hotazel Iron Formation, Kalahari Manganese Field, SouthAfrica. Economic Geology, 98 (7) 1449-1462 doi:10.2113/gsecongeo.98.7.1449 | Journal (article/letter/editorial) | | Hotazel Iron Formation, Kalahari Manganese Field, South Africa HARILAOS TSIKOS,â ,* NICOLAS J. BEUKES, Geology...2006, South Africa JOHN M. MOORE, Geology Department, Rhodes University, Grahamstown 6140, South Africa...Geological Sciences, University of Cape Town, Rondenbosch 7700, South Africa Abstract The Kalahari manganese...manganese field in the Northern Cape province, South Africa, is a world-class manganese resource (ca. 8 billion...Formation in the uppermost Paleoproterozoic (2.65â2.05 Ga) Transvaal Supergroup and comprises three laminated |  | | Journal (article/letter/editorial) | | (Karatau, Khubsugul, and South China basins), Australia (Georgina basin), Africa Fig. 1. Geological structure...(1) Proterozoic, Kokdzhot Formation: phyllites, quartzâsericiteâchlorite schists (Prt1); (2) Lower Cambrian...USSR san Ara 1 E N A AS AR Pg2 + 3 aT sa ga ba s -ta r-s To ai 1 Lake Khubsugul Ă Bag...Karatau range (Kazakhstan). (b) Section of the northern Tszyangsi Province (Bushinskii, 1966). (c) Section...Depression (Bushinskii, 1966). (d, e) Sections in the northern Sinan Depression (Bushinskii, 1966). (1) Gneisses |  | | Journal (article/letter/editorial) | | the Palaeoproterozoic Kuruman Iron Formation, Northern Cape Province, South Africa: evidence for simultaneous...the Palaeoproterozoic Kuruman and Griquatown Iron Formations in the Northern Cape Province. They document...for the top of the Riries Member, and hence the Kuruman Iron Formation is 2460 Ma, where most of the zircon...compacted sedimentation rate (cSR) for the entire Kuruman Iron Formation is 3â4 m per million years, a cSR...suggesting that there are cryptic gaps within the Kuruman stratigraphic record. The latter is comparable |  | | Journal (issue) | | Carl A. Francis Maine Mineral & Gem Museum, ME John Rakovan New Mexico Institute of Mining & Technology...Bruce Cairncross, University of Johannesburg, South Africa Steven C. Chamberlain, Syracuse, NY Merrill...edition for any number of concurrent users across a local area network. Subscription offices: USA/North America:...such use are referred directly to the requester's local Reproduction Rights Organization (RRO), such as...Thompson, Maine Geological Survey, Augusta, ME John S. White, Stewartstown, PA Social Media Editor Philip |  | | Journal (article/letter/editorial) | | of the Griqualand West Sequence, Northern Cape Province, South Africa, in comparison with other Precambrian...Universityof Stellenbosch, 7600 Stellenbosch, South Africa Received 30 August 1993;revised versionaccepted...Griquatown and Kuruman Iron Formations of the Asbestos Hills Subgroup (Transvaal Supergroup, South Africa) have... < 4 to 4 ppm Th, < 4 to 19 ppm Pb, < 3 to 4 ppm Ga, < 4 to 33 ppm Zn, < 6 to 69 ppm Cu, < 7 to 17 ppm...geochemical similarity between the microbanded Kuruman Iron Formation and the interbedded granular and |  | | Journal (article/letter/editorial) | | crust. In contrast, eclogite xenoliths from Kuruman, South Africa and Koidu, Sierra Leone stem from protoliths...picritic cumulates from intermediate pressures (1 â 2 Ga) and were subsequently transposed to higher pressures...such as Roberts Victor, Bellsbank, Newlands (South Africa), and Zagadochnaya (Siberia). This overabundance...rights reserved. doi:10.1016/j.lithos.2004.03.038 local enrichment of eclogite within the predominantly...eclogites from the margin of the Kaapvaal craton (Kuruman province) to be derived from phlogopite âpyroxenite |  | | Journal (article/letter/editorial) | | Printed in The Netherlands SEDIMENTOLOGY OF THE KURUMAN AND GRIQUATOWN IRONF O R M A T I O N S , T R A...P E R G R O U P , G R I Q U A L A N D WEST, SOUTH AFRICA N.J. BEUKES Department of Geology, Rand Afrikaans...Afrikaans University, Johannesburg 2001 (South Africa) (Received December 2, 1982; revision accepted August...the Kuruman and Griquatown Iron-formations, Transvaal Supergroup, Griqualand West, South Africa. Precambrian...an iron-formation sequence represented by the Kuruman and Griquatown Iron-formations was deposited. This |  | | Journal (article/letter/editorial) | | Rand Afrikaans University, Johannesburg, 2000 (South Africa) 3Department of Earth and Space Sciences, University...iron-formation ( Kuruman Iron Formation) transition of the Transvaal Supergroup, South Africa, estimated to...to be 2.5-2.3 Ga years old. The microfossils occur in petrographic thin-sections of a core sample of...(Campbellrand) to the overlying iron-rich sediments of the Kuruman-Griquatown Iron Formations. The average J13C value...c r a t o n in G r i q u a l a n d W e s t , South Africa, has provided unique core sections 0301-9268/87/$03 |  | | Journal (article/letter/editorial) | | Erel b, John M. Moore a a b Geology Department, Rhodes University, Grahamstown 6140, South Africa Institute...banded iron-formation manganese Palaeoproterozoic South Africa a b s t r a c t The Hotazel Formation in the...NeoarchaeanâPalaeoproterozoic Transvaal Supergroup of southern Africa is an unusual sedimentary sequence of banded iron-formation...full oxidative cycle in shallow oceans at ca. 2.3 Ga. We present iron isotope results from BIF and Mn-rich...stratigraphic portion of the Transvaal Supergroup (Kuruman and Griquatown BIFs). The unique end-member geochemical |  | Johnson, J.E., Webb, S.M., Condit, C.B., Beukes, N.J., Fischer, W.W. (2019) Effects of metamorphism and metasomatism on manganese mineralogy: Examples from the Transvaal Supergroup. South African Journal of Geology, 122 (4) 489-504 doi:10.25131/sajg.122.0034 | Journal (article/letter/editorial) | | University of Johannesburg, Auckland Park, 2006, South Africa e-mail: nbeukes@uj.ac.za W.W. Fischer Department...wïŹscher@caltech.edu © 2019 December Geological Society of South Africa Abstract Manganese-bearing minerals in ancient...metamorphic gradients in the Kaapvaal craton, South Africa, in Archean and early Paleoproterozoic age carbonate-...typically contained Mn concentrated into a combination SOUTH AFRICAN JOURNAL OF GEOLOGY 2019 doi:10.25131/ sajg...in and around the nearby Broken Hill ore body in south eastern Australia (Spry and Wonder, 1989; Plimer |  | | Journal (article/letter/editorial) | | oxygen in the Great Oxidation Event at ca. 2.45-2.32 Ga. BIFs hold the key to understanding the chemistry...ferruginous cherts that range in age from 3.45 to ca. 2.4 Ga and that preserve depositional features indicates...analogues. They are composed essentially of chert or quartz bands interlayered with bands of a variety of iron-rich...first rise in atmospheric oxygen at ca. 2.45-2.32 Ga, e.g. interlayered with volcanic and sedimentary...Western Australia and the Transvaal basin of South Africa. Major iron formations disappeared from the |  | | Journal (issue) | | Figure 7. Elbaite (var. indicolite) with rose quartz (unrepaired), 11.7 cm, from the Santa Rosa mine...JanuaryâFebruary, 2023 29 Figure 29. Emerald beryl with quartz crystals, 4.6 cm, from the Brumado mine, Bahia...volume 54, JanuaryâFebruary, 2023 Figure 30. Smoky quartz (âcathedralâ habit), 44 cm, from Divino das Laranjeiras...31. Elbaite, 9.2 cm, from the Barra do Salinas District, Coronel Murta, Minas Gerais, Brazil. Will Johnson... JanuaryâFebruary, 2023 33 Figure 33. Smoky quartz with rutile inclusions, 4.2 cm, from Novo Horizonte |  | | Journal (article/letter/editorial) | | development of the Sishen South (Welgevonden) iron ore deposit, South Africa, as deduced from ground gravity...Palaeoproterozoic Transvaal Supergroup in the northern Cape Province of South Africa hosts high grade (.60%Fe) hematitic...structure known as the Maremane dome. The bulk of South Africaâs iron ore production is currently provided...Resources megaton Sishen iron ore mine on the northern end of the dome, and the smaller Assmang Beeshoek...on the southern closure. The undeveloped Sishen South deposit, which contains ,400 Mt of high-grade hematite |  | | Catalog/List | | RAINBOW OF AFRICA GEM & MINERAL COLLECTION Front Cover: Gems from the Rainbow of Africa Collection... Heritage SignatureÂź Auction #5236 The Rainbow of Africa Collection Gems & Minerals October 15, 2015 | New...SignatureÂź Internet Session 2 Heritage Auctions Design District Annex 1518 Slocum Street âą Dallas, TX 75207 (HERITAGELive...RAINBOW OF AFRICA COLLECTION You have in front of you our presentation of the Rainbow of Africa Collection:...The mineral riches of Africa are not the only things making up the Rainbow of Africa Collection. For the |
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Kuruman, Ga-Segonyana Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa