 | | Journal (article/letter/editorial) | | paragenesis and compositions of groundmass phlogopite, geikielite and MgāTi-enriched spinel, the dike is classified...compositions des minĆ©raux de la pĆ¢te (phlogopite, geikielite et spinelle enrichi en MgāTi, la roche serait...and icecaps. The main regions are, from north to south: Sisimiut, Sarfartoq and Maniitsoq, including the...concluded by Mitchell et al. (1999), dikes from the northern and central parts of the province on either side...2), mostly euhedral Mg-rich FeāTi spinel and geikielite crystals (ilmenite group) set in a patchy mesostasis |  | | Journal (article/letter/editorial) | | 119. Albite from Binnenthal, 16. - - German East Africa, 178. Allen (E. T.), synthesis of minerals, 281...crystallization of, 134. Amethyst from German East Africa, 178. Amiantos of ancients = chrysotile, 143. Ammonium...compounds, xxii. Barrow (G.), axinite from Bodmin district, xxxvi. Barytes from Binnenthal, 190. Co. Tipperary...elected member, xix. Canadian economic minerals, 196. Cape of Good Hope meteorite, 37. Caperr meteorite, 41...German East Africa, 178. Cl~ok (T.), elected member, xli. -and Jones (B. M.), geikielite and the ferro-magnesian | | | Journal (article/letter/editorial) | | 119. Albite from Binnenthal, 16. - - German East Africa, 178. Allen (E. T.), synthesis of minerals, 281...crystallization of, 134. Amethyst from German East Africa, 178. Amiantos of ancients = chrysotile, 143. Ammonium...compounds, xxii. Barrow (G.), axinite from Bodmin district, xxxvi. Barytes from Binnenthal, 190. Co. Tipperary...elected member, xix. Canadian economic minerals, 196. Cape of Good Hope meteorite, 37. Caperr meteorite, 41...German East Africa, 178. Cl~ok (T.), elected member, xli. -and Jones (B. M.), geikielite and the ferro-magnesian |  | | Report (issue) | | Geikielite MgTiO3 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Hexagonal. Point Group:...Siberia. At Kimberley, Cape Province, South Africa. From north of the Mahogany mine, Hartley district, Zimbabwe...(2) GiereĢ, R. (1987) Titanian clinohumite and geikielite in marbles from the Bergell contact aureole. |  | | Journal (article/letter/editorial) | | (diopside); Djādjerfisherite; Dolādolomite; Gkāgeikielite; Grtāgarnet (pyrope); Gthāgoethite; HGMāhollandite-group...Rt Prv Cr-rich geikielite-ilmenite (Ilm1) ferroan geikielite (Ilm2) Fe-poor geikielite (Ilm2) Mn-rich...comprising (geikielite, perovskite, rutile, chromite, comprising kimberlitic (geikielite,kimberlitic...and compositions within the rock. An ilmenite-geikielite (Ilm:Gk = ~50:50) solid-solution enriched in...range of compositions from ferroan geikielite to Fe-poor geikielite, with MgO and MnO gradually increasing |  | | Journal (article/letter/editorial) | | in picritic basalts from the Karoo Province, South Africa R. GRANT CAWTHORN Geology Department, University...University of the Witwatersrand, Wits, 2050, South Africa JOHN W. BRISTOW Geology Department, De Beers Consolidated...Consolidated Mines, Box 47, Kimberley, 8300, South Africa AND D A V I D I . GROVES Geology Department...ilmenite, ilmenite, basalts, Karoo Province, South Africa. Introduction ILMENITE is a widely distributed...show variable solid solution towards MgTi03--the geikielite molecule, reaching a maximum of 20% MgO in groundmass |  | | Journal (article/letter/editorial) | | Phenocrysts of Mn-rich picroilmenite and Fe-rich geikielite in kimberlites of both phases are similar in...group minerals (ilmenite FeTiO3, hematite FeFeO3, geikielite MgTiO3, pyrophanite MnTiO3, escolaite CrCrO3...temperature, they form ilmeniteāhematite, ilmeniteāgeikielite, and ilmeniteāpyrophanite solid solution series...autoliths, and phenocrysts of ilmenite, ferri-geikielite, and rare manganilmenite) commonly enriched in...picroilmenite; composition 2 corresponds to MnāFe-bearing geikielite enriched in Fe3+ and Nb. Isolated unzoned ilmenite |  | Xu, Jingyao, Melgarejo, Joan, Li, Qiuli, Abat, Lisard, Castillo-Oliver, Montgarri (2020) Magma Mingling in Kimberlites: Evidence from the Groundmass Cocrystallization of Two Spinel-Group Minerals. Minerals, 10 (9) 829 doi:10.3390/min10090829 | Journal (article/letter/editorial) | | core mantled by a first rim in which rutile, geikielite, and spinel s.s. (spinel sensu stricto) cocrystallized...microphenocrysts (about 200 Āµm), which are replaced by geikielite along their margins and along fractures, and...(Figure 2e) and which, in turn, is replaced by geikielite and MUM. Minerals 2020, 10, 829 4 of 19 Djerfisherite...small inclusions in fresh olivine, together with geikielite (Figure 2c). The groundmass spinel s.s. is found...sequence of rutile, geikielite, and qandilite (Figure 2d,e); (3) euhedral to anhedral geikielite as inclusions |  | | Journal (article/letter/editorial) | | type 1 ilmenite by a succeeding generation of geikielite (type 2) along grain boundaries and cracks occurs...Keywords Magnesian ilmenite . Manganoan ilmenite . Geikielite . Kimberlite . India Introduction Ilmenite is...southern Wajrakarur kimberlite field (WKF); 2) the northern Narayanpet kimberlite field (NKF); and 3) the...in the ilmenite sensu strictu (s.s.) field; 2) geikielite replacing chromite xenocrysts and type 1 ilmenite...ilmenite (replacing Mg-rich ilmenite to form geikielite) They are largely found as a replacement product |  | | Journal (article/letter/editorial) | | titanates from the Jagersfontein kimberlite, South Africa: Implications for metasomatism in the upper...Cr-ferropseudobrookite, and armalcolite is equivalent to Cr-geikielite + rutile in the system (FeMg)-Ti02-Cr203. This...geochemistry, given that leucite-lamproities in West Kimberley, Australia (WADEand PRIDER, 1940; PRIDER, 1960)...kimberlite, 130 km SE of the Kimberley diatrcme complex in the Republic of South Africa. Data on this kimberlite...Bultfontein, De Beers and Kolonkwanen kimberlites in South Africa (HAG GERTYet al., 1983). 1835 Twenty nine |  | Giuliani, Andrea, Soltys, Ashton, Phillips, David, Kamenetsky, Vadim S., Maas, Roland, Goemann, Karsten, Woodhead, Jon D., Drysdale, Russell N., Griffin, William L. (2017) The final stages of kimberlite petrogenesis: Petrography, mineral chemistry, melt inclusions and Sr-C-O isotope geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Chemical Geology, 455. 342-356 doi:10.1016/j.chemgeo.2016.10.011 | Journal (article/letter/editorial) | | geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani, Ashton Soltys, David...geochemistry of the Bultfontein kimberlite (Kimberley, South Africa), Chemical Geology (2016), doi:10.1016/j...the SC RI PT Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani1,2,3*, Ashton Soltys1...(BK) from the Bultfontein kimberlite (Kimberley, South MA Africa). Sample BK consists of abundant macrocrysts...to perovskite in the Bultfontein and the other Kimberley kimberlites, i.e. magmatic values. The ļ¤18O composition |  | Li, Yunshuai, Zhang, Jianxin, Mostofa, Khan M.G., Wang, Yuebo, Yu, Shengyao, Cai, Zhihui, Li, Pengfei, Zhou, Guisheng, Fu, Changlei, Mao, Xiaohong (2018) Petrogenesis of carbonatites in the Luliangshan region, North Qaidam, northern Tibet, China: Evidence for recycling of sedimentary carbonate and mantle metasomatism within a subduction zone. Lithos, 322. 148-165 doi:10.1016/j.lithos.2018.10.010 | Journal (article/letter/editorial) | | carbonatites in the Luliangshan region, North Qaidam, northern Tibet, China: Evidence for recycling of sedimentary...carbonatites in the Luliangshan region, North Qaidam, northern Tibet, China: Evidence for recycling of sedimentary...carbonatites in the Luliangshan region, North Qaidam, northern Tibet, China: Evidence for recycling of sedimentary...meters in the Luliangshan region, North Qaidam, northern Tibet, China. On the basis of modal olivine (Ol)...garnet peridotite-gneiss unit is located ~20 km south of Da PT Qaidam town (Fig. 2), and mainly consists |  | | Journal (article/letter/editorial) | | Dutoitspan and Newlands kimberlite pipes in southern Africa. Therefore, the oxidation state of the MARID suite...entropy of mixing on the ilmeniteāhematite and geikieliteā hematite joins was explicitly formulated in...(BD2394) from the Bultfontein diamond mine, South Africa contains coexisting ilmenite, chromite and rutile...MARID Nodules from the Kimberley Pipes, South Africa, PhD thesis, University of Cape Town, 1987. S.E. Haggerty...Island, Canada, 7th IKC Extended Abstract Volume, Cape Town, 1998, pp. 998ā1000. S.A.C. Webb, B.J. Wood |  | Rehfeldt, Tatjana, Foley, Stephen F., Jacob, Dorrit E., Carlson, Richard W., Lowry, Dave (2008) Contrasting types of metasomatism in dunite, wehrlite and websterite xenoliths from Kimberley, South Africa. Geochimica et Cosmochimica Acta, 72 (23) 5722-5756 doi:10.1016/j.gca.2008.08.020 | Journal (article/letter/editorial) | | wehrlite and websterite xenoliths from Kimberley, South Africa Tatjana Rehfeldt a,*, Stephen F. Foley...xenolith suite in the Kimberley kimberlites of the Kaapvaal Craton in southern Africa. All three types were...the xenolith suite found in the Kimberley kimberlites of South Africa. However, only few studies of these...websterite xenoliths retrieved from the Kimberley kimberlites of South Africa. The results are compared with the...IN RELATION TO MAGMATIC EVENTS IN THE KIMBERLEY AREA The Kimberley kimberlite cluster is situated in the |  | Xu, Jingyao, Melgarejo, Joan Carles, Castillo-Oliver, Montgarri, ArquĆ©s, Laia, Santamaria, Joan (2018) Ilmenite generations in kimberlite from Banankoro, Guinea Conakry. Neues Jahrbuch fĆ¼r Mineralogie - Abhandlungen Journal of Mineralogy and Geochemistry, 195 (3) 191-204 doi:10.1127/njma/2018/0096 | Journal (article/letter/editorial) | | Spinels, Magnesian ilmenite, Manganoan ilmenite, Geikielite ervation (Gurney et al. 1993, Gurney & Zweistra...Prefecture (Kankan Region, South-Eastern Guinea), in the Man craton, West Africa. Most of the mines exploited...by small veinlets filled up by small anhedral geikielite (ilmenite 1). This ilmenite is overgrown by anhedral...in BSE mode. a) Geikielite (Ilm1) fills veins in olivine xenocryst (Ol1), geikielite is replaced by titanomagnetite...Macrocrysts chromite Spl4 phlogopite Phl2 Ilm1 geikielite Veinlets Phl1 phlogopite in olivine Spl1 titanomagnetite |  | | Journal (article/letter/editorial) | | nodules, as regards Mg, Fe, A1 and Cr contents; the geikielite content ranges from 25 to 37 mol %. No outwards...~ Fig. 1. Sketch map of the Ahaggar volcanic district black: volcanices; white." Precambrian basement;...Mg-ilmenite which contains from 25 to 37 mol percent of geikielite (MgTiO3) and up to 9 mol percent of hematite...8 1'0 12 14 16 MgO Fig. 8. a Ternary diagram geikielite/ilmenite/hematite with the field for kimbertitic...megacrysts in basanitic lavas near Armidale, New South Wales. Am J Sci 267A:33 49 Boctor NZ, Boyd FR (1980) |  | | Journal (article/letter/editorial) | | pyroxene-ilmenite intergrowths among xenoliths from South African Kimberlites is described. Chemical analyses...State), the Frank Smith Mine (NW of Barkly West, Cape Province) and in fissure kimbeflites from Tanganyika..."recrystallised pyroxene". During a recent visit to Kimberley by one of us (J.F.L.), a collection of clinopyroxene-ilmenite...xenolith from kimberlite at Monastery Mine, South Africa, consisting of an oriented intergrowth of ilmenite...considerable amounts of magnesium, present as geikielite components, whilst the pyroxenes have Ca/(Ca |  | | Journal (article/letter/editorial) | | in relatively small geographical areas such as northern Tanzania, xenoliths from diĀerent eruptive sites...xenoliths from kimberlite, specimens from Kimberley, South Africa have formed the basis of several metasomatism...veined and metasomatised harzburgite xenolith from Kimberley which provides evidence for further metasomatic...from the kimberlite waste dump at Boshof Road, Kimberley. It is an angular block measuring approximately...the 82Ā2-Ma age for the kimberlite magmatism at Kimberley (Allsopp and Barrett 1975). When examined by backscattered |  | | Journal (article/letter/editorial) | | inclusion with intergrown titanoclinohumite, olivine, geikielite, and mica(?) described by McGetchin and Silver...have formed by subsolidus reactions involving geikielite, olivine, and vapor or a hydrate. No good evidence...in metasomatized peridotite nodules from the Kimberley pipes (Erlank et al. 1987). The amphibole-carbonate...in veins in harzburgite from the Kimberley district of South Africa have been described by Haggerty et...metasomatism in peridotite nodules from the Kimberley pipes, South Africa. In: Menzies MA, Hawkesworth CJ (eds) |  | Clark, A. M., Smith, D. A., Symes, R. F., Tandy, P. C., Hart, A. D. (1995) Catalogue of Type Mineral Specimens in the Natural History Museum, London - With an appendix listing mineral species and varieties originally described from the British Isles. Natural History Museum, London. | Book | | 7, p. 1221. Aerugite (Neotype) BM 1963,00481 South Terras mine, St-Stephen-in-Brannel, Cornwall, England...(Cotype) BM 1925,00080 Dutoitspan mine, Kimberley, South Africa J. Parry and F. E. Wright (1925) Min. Mag...pp. 189, 276. Allanite (Cotype) BM 94377 Alluk, South Greenland T. Thomson (1810) Trans. Roy. Soc. Edinburgh...Arsenoflorencite-(Ce) (Cotype) BM 1986,00481 Eyre Peninsula, South Australia E.H. Nickel & J.E. Temperly (1987) Min...(Cotype) BM 1985,00017 Nonh Lily mine, East Tinric District, Utah, USA C. Frondel & R.M. Honea. ( 1968) Amer |  | | Journal (article/letter/editorial) | | Cretaceous to late Jurassic) kimberlites in the Kimberley area. The metasomatic style is characterized by...emplacement ages of group I kimberlites in the Kimberley area dated at 83 Ā 4 (2r) and 84 Ā 0.9 Ma. One...both group I and II kimberlite magmatism in the Kimberley area. MARID and PKP zircon ages are also consistent...1975; Smith 1983) and cluster around 85 Ma in the Kimberley area. Konzett et al. (1995, 1998), using SHRIMP...1998) and kimberlitic megacryst zircons from the Kimberley area (B98: Belousova et al. 1998). Arrows mark |  | Castillo-Oliver, Montgarri, Melgarejo, Joan Carles, GalĆ, Salvador, Pervov, Vladimir, GonƧalves, Antonio Olimpio, Griffin, William L., Pearson, Norman J., O'Reilly, Suzanne Y. (2017) Use and misuse of Mg- and Mn-rich ilmenite in diamond exploration: A petrographic and trace element approach. Lithos, 292. 348-363 doi:10.1016/j.lithos.2017.09.021 | Journal (article/letter/editorial) | | Angola is the fourth largest diamond producer in Africa (Faure, 2010), ACCEPTED MANUSCRIPT very few...al., 2009; Castillo-Oliver et al., 2016). On a local scale, RI kimberlite intrusion is thought to be...apatite-kaersutite-ilmenite assemblage. In the ilmenite-geikielite-pyrophanite-hematite end-member ternary diagrams...megacrysts from both economic and non-economic South African kimberlites could also be consistently distinguished...the analysed ilmenites in terms RI of their geikielite (MgTiO3), ilmenite (FeTiO3), hematite (Fe2O3) |  | | Journal (article/letter/editorial) | | the Koidu kimberlite dikes, Sierra Leone, West Africa Linda A. Tompkins* and Stephen E. Haggerty Department...Extraordinarily high MnO (max 17 wt%) contents and high geikielite (62 mole%) concentrations expand the ilmenite...exposure of Dike Zone B that outcrops along the northern wall of pipe 1 (Fig. 1) but extends off the diagram...with spinel trends in kimberlites from southern Africa and the Canadian Shield. Mt, magnetite; Magfer...analysis Hem = hematite; Ilm = ilmenite; Geik = geikielite; Pyroph = pyrophanite TiOz 9ol/~, /" z0t ~pR |  | | Journal (article/letter/editorial) | | b Mineral Services South Africa, Cape Town 7430, South Africa c University of Cape Town Kimberlite Research...Research Group, Cape Town 7700 South Africa d Mineral Services Canada, North Vancouver, British Columbia...All rights reserved. Keywords: Picroilmenite; Geikielite; Hematite; Kimberlite; Exploration; Classification...areas hosting kimberlite intrusions. In Southern Africa, ilmenites are present in the volcanic successions...Southern Africa Kimberlites On-craton Southern Africa Kimberlites Kimberlites West Africa North America |  | | Journal (article/letter/editorial) | | 5%. The titaniferous oxides: rutile (Ti02), geikielite (MgTi03) At 1,000Ā°C and 1,000 bar, futile appears...individuals. In run products of high temperature, geikielite has small rounded grains of 1--6 ~m in diameter;...triangular grains are obtained. Both rutile and geikielite have a high birefringence and a high refractive... morphological criteria were sometimes used: geikielite is present as small rounded grains, whereas rutile...product. The peaks used for the identification of geikielite are at 2.22, 2.72 and 3.71 A; for rutile they |
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