	Mc Kenna, N., Gurney, J.J., Klump, J., Davidson, J.M. (2004) Aspects of diamond mineralisation and distribution at the Helam Mine, South Africa☆. Lithos, 77 (1) 193-208 doi:10.1016/j.lithos.2004.04.004	Journal (article/letter/editorial)
	mineralisation and distribution at the $ Helam Mine, South Africa N. Mc Kenna a,, J.J. Gurney a, J. Klump...Rondebosch 7700, South* Africa b Helam Diamond Mine, PO Box 2, Swartruggens 2835, South Africa Received 27...20 May 2004 Abstract The diamonds from the Swartruggens dyke swarm are mainly tetrahexahedra, with subsidiary...Megacryst; Majorite; Type IaAB; Type Ib; Group I eclogite 1. Introduction The Swartruggens kimberlite...name of Helam Mine is situated approximately 60 km west of the town of Rustenburg, North – West Province
	Bobrov, A. V., Dymshits, A. M., Litvin, Yu. A. (2009) Conditions of magmatic crystallization of Na-bearing majoritic garnets in the earth mantle: Evidence from experimental and natural data. Geochemistry International, 47 (10) 951-965 doi:10.1134/s0016702909100012	Journal (article/letter/editorial)
	series of solid solutions: (1) garnet (Prp–NaGrt–majorite) and (2) pyroxene (Jd–clinoenstatite–Eskola molecule)...The existing methods of pressure estimation for majorite assemblages are based on aluminum replacement...Australia) [5] fPer + MgSiO3 Koffiefontein (South Africa) [5] fPer + MgSiO3 + CaSiO3 + TAPP Sao Luiz...Craton (Canada) [12] Maj + Omp Monastery (South Africa) [13] Maj + Omp Sao Luiz (Brazil) [14] ... [15] Maj Jagersfontein (South Africa) [16] Maj Helam (South Africa) [17] Maj Brazil [18] Maj
	Sirotkina, E. A., Bobrov, A. V., Bindi, L., Irifune, T. (2015) Phase relations and formation of chromium-rich phases in the system Mg4Si4O12–Mg3Cr2Si3O12 at 10–24 GPa and 1,600 °C. Contributions to Mineralogy and Petrology, 169 (1) doi:10.1007/s00410-014-1097-0	Journal (article/letter/editorial)
	range of starting compositions for the knorringite–majorite system to derive a P–X phase diagram and synthesize...the pressure range 10–14 GPa contain knorringite–majorite garnet and Crbearing pyroxene. With increasing...knorringite–majorite garnet and eskolaite is formed. Garnets contain a significant portion of majorite (>10...Mg3Cr2Si3O12 starting composition. Knorringite–majorite garnets were obtained in the pressure range from...to the primitive mantle. Keywords Knorringite · Majorite · Bridgmanite · Akimotoite · Mantle · High P–T
	Stachel, Thomas, Banas, Anetta, Muehlenbachs, Karlis, Kurszlaukis, Stephan, Walker, Edward C. (2006) Archean diamonds from Wawa (Canada): samples from deep cratonic roots predating cratonization of the Superior Province. Contributions to Mineralogy and Petrology, 151 (6) 737-750 doi:10.1007/s00410-006-0090-7	Journal (article/letter/editorial)
	harzburgitic garnet inclusions contain a small majorite component suggesting crystallization at depth...gold-bearing sediments of the Witwatersrand Basin in South Africa (3.0–2.8 Ga; Robinson 1979; Poujol et al. 2003)...The Wawa diamond deposits are located ca. 20 km north of the town Wawa (Ontario) along the TransCanada...claim block diﬃcult. Currently two main zones (South and North) of volcaniclastic deposits, tens of meters...‘‘Genesis’’ (South Zone) and ‘‘Cristal’’ (a stratigraphically older occurrence in the south-east of the
	*Matrosova, Ekaterina A., Bobrov, Andrey V., Bindi, Luca (2020) Geochemistry of Chromium in the Earth’s Mantle. Springer International Publishing. doi:10.1007/978-3-030-27018-6*	Book
	Concentrations on Crystallization of Garnet in the Majorite-Knorringite System . . . . . . . . 3.4.2 Crystallization...Aluminum-rich bridgmanite Al-rich garnet Al-rich majorite Anhydrous phase B Bridgmanite (MgSiO3 with perovskite-type...Ilmenite Knorringite (Mg3Cr2Si3O12) Lherzolite Majorite (Mg4Si4O12) Magnesiochromite Mg(Mg,Cr)(Mg,Si)O4...Gottlob Lehmann (1719–1767) in the Beryozovskoye Mine (Ural Mountains, Russia) and initially used as a...largest deposits of chromium are located in South Africa (first place in the world, ~2/5 of chromite
	*Mitchell, Roger Howard (1995) Kimberlites, Orangeites, and Related Rocks. Springer US. doi:10.1007/978-1-4615-1993-5*	Book
	discovery of these rocks in the Orange Free State of South Africa. The name is not a new one: In 1928, Percy Wagner...Orangeites . 1. 8.1. Finsch . . . . . . . . 1.8.2. Barkly West Region. 1.8.2.1. Bellsbank. 1.8.2.2. Sover . . ...3. Boshof District . . . 1.8.3.1. Roberts Victor 1.8.3.2. New Elands 1.8.4. Winburg District ... 1.8.5...Kroonstad District .. 1.8.6. Swartruggens District. 1.8.7. Dokolwayo .. 1.8.8. Prieska District 1.8.9. Summary...Biotite Macrocrysts . . 2.1.5. Micas from the Swartruggens Male Lamprophyre 2.1.6. Summary of Mica Compositional
	*Gurney, J. J., Helmstaedt, H. H., Richardson, S. H., Shirey, S. B. (2010) Diamonds through Time. Economic Geology, 105 (3) 689-712 doi:10.2113/gsecongeo.105.3.689*	Journal (article/letter/editorial)
	of Cape Town, Rondebosch, 7700, Republic of South Africa of Geological Sciences and Geological Engineering...P O Box 38668, Pinelands, 7430. Republic of South Africa. 0361-0128/10/3894/689-24 the mantle, as far...equivalents of such rocks from below the SCLM, such as majorite-bearing assemblages. 689 Submitted: March 16...population of xenocrystic diamonds contributing to run-of-mine production. Evidence is accumulating that the diamond-forming...identified by occasional mineral inclusions such as majorite, ferropericlase, magnesiowustite, native iron
	Bobrov, A. V., Litvin, Yu. A., Bindi, L., Dymshits, A. M. (2008) Phase relations and formation of sodium-rich majoritic garnet in the system Mg3Al2Si3O12–Na2MgSi5O12 at 7.0 and 8.5 GPa. Contributions to Mineralogy and Petrology, 156 (2) 243-257 doi:10.1007/s00410-008-0283-3	Journal (article/letter/editorial)
	from several localities worldwide, including South Africa (Moore and Gurney 1985; Moore et al. 1991; Mc...Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia L. Bindi Museo di Storia Naturale...(NaAlSi2O6) L melt and products of melt quenching Maj majorite (Mg4Si4O12) NaPx sodium pyroxene (NaMg0.5Si2.5O6)...manufactured from lithographic limestone (Algeti Mine, Georgia) and contained ultra-pure graphite heater...absorption following the semiempirical method of North et al. (1968). The merging R for 123 254 Contrib
	*Bobrov, A. V., Litvin, Yu. A. (2011) Mineral equilibria of diamond-forming carbonate-silicate systems. Geochemistry International, 49 (13) 1267-1363 doi:10.1134/s0016702911130015*	Journal (article/letter/editorial)
	the kimberlitic pipes of Monastery (South Africa), Sloan (North America), and XXIII Congress of the CPSU...of diamonds with crystal line inclusions from South African kimberlite pipes [42]. Sulfide inclusions...03 atoms per formula unit (a.f.u.). In fact, “majorite” is a mineral of the “pyroxene” (MgSiO3) composition...Moore and Gurney [11] in the Monas tery pipe (South Africa). This finding demonstrated that diamonds could...inclusions in diamond all over the world, including South Africa [11, 13], Brazil [99], Guinea [14], Russia [104–106]
	*Stachel, T., Harris, J.W. (2008) The origin of cratonic diamonds — Constraints from mineral inclusions. Ore Geology Reviews, 34 (1) 5-32 doi:10.1016/j.oregeorev.2007.05.002*	Journal (article/letter/editorial)
	inclusion-bearing diamonds from the mines of South Africa and Botswana was begun by Gurney and Harris...diamonds is not known. In early work (1973–1985) run-of-mine diamonds in the sieve class −6 + 5 (1.83 mm aperture...the −6 + 5 sieve class) in run-of-mine productions from South Africa and Botswana are listed in Table...comparison of two studies (1975 and 1985) for the Finsch Mine shows a sevenfold increase in the abundance of inclusionbearing...never quantiﬁed for such mines as Roberts Victor (South T. Stachel, J.W. Harris / Ore Geology Reviews
	Matrosova, Ekaterina A., Bobrov, Andrey V., Bindi, Luca, Pushcharovsky, Dmitry Yu., Irifune, Tetsuo (2020) Titanium-rich phases in the Earth's transition zone and lower mantle: Evidence from experiments in the system MgO–SiO2–TiO2(±Al2O3) at 10–24 GPa and 1600 °C. Lithos, 366. 105539pp. doi:10.1016/j.lithos.2020.105539	Journal (article/letter/editorial)
	Gkl geikielite L melt Journal Pre-proof majorite (Mg4 Si4 O12 ) MST-Brd high-Ti (and high-Al)...mm in height and 1.2 mm in diameter made of a platinum foil. The capsule al was insulated from the...pfu oo f Si, indicating incorporation of the majorite end-member. The concentration of silicon pr ...kimberlites of northern Lesotho and the Monastery Mine, South Africa. Phys. Chem. Earth 9, 431-454. Boyd, F. R...ilmenite-silicate nodules in kimberlites from Lesotho and South Africa. Lesotho Kimberlites, 254. Chakhmouradian, A
	*Litvin, Yu. A., Spivak, A. V., Kuzyura, A. V. (2016) Fundamentals of the mantle carbonatite concept of diamond genesis. Geochemistry International, 54 (10) 839-857 doi:10.1134/s0016702916100086*	Journal (article/letter/editorial)
	transition zone have (wadsleyite ↔ ringwoodite)–majorite– stishovite–carbonatite–carbon compositions, and...transition zone. Wd, wadsleyite; Rw, ringwoodite; Maj, majorite; CaPrv, Ca-perovskite; Cpx, clinopyroxene; Sti...ultrabasic (wadsleyite ↔ ringwoodite)–majorite–carbonatite and basic majorite– stishovite–carbonatite melts with...transition zone have (wadsleyite↔ringwoodite)–majorite– stishovite–carbonatite–carbon compositions; lower...mineralization and distribution at the Helam Mine, South Africa,” Lithos 77, 193–208 (2004). H. O. A.
	*Litvin, Yuriy A. (2017) Genesis of Diamonds and Associated Phases. Springer International Publishing. doi:10.1007/978-3-319-54543-1*	Book
	mantle eclogite rock has been found in 1897 at South African kimberlitic pipe. It is now appreciated...solution phases (FeS∙NiS)ss Nahkolite NaHCO3 Na-majorite Na2MgSi5O12 Niererite Na2Ca(CO3)2 Olivine (Mg...The peridotitic rocks at kimberlitic pipes of South Africa (Mathias et al. 1970) are represented as garnet...and basic upper-mantle-rocks in kimberlites of South Africa and Yakutia make it possible to establish that...represented by the kimberlitic pipes Roberts-Victor (South Africa) with 20% of ultrabasic and 80% of eclogitic
	*(1998) Extended Abstracts - 7th International Kimberlite Conference Cape Town* .**	Book
	responsibility for authors’ errors and omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE...Survey of South Africa) SouthemEra Resources Ltd SOCIETY SPONSORS Geological Society of South Africa (GSSA)...a Phanerozoic subduction regime in eastern New South Wales, Australia. Mantle Dynamics beneath Mongolia:...growth of Archean cratons: a case study from west Africa. The vertical distribution of indicator minerals...diamond. 61 Cr-poor Megacrysts from the Frank Smith Mine and the source regions of transitional kimberlites
	*(1995) Sixth International Kimberlite Conference: Extended Abstracts. International Kimberlite Conference. 732pp.*	Book
	(Novosibirsk) International Treasurer: H.O.Meyer (USA) Local Treasurer: 0 AKozmenko (Novosibirsk) Members: V...associated alkalic basaltic rocks from Pishin District, Pakistan.4 Reasons of variations of individual...prognosis and prospering of diamond's host rocks on the south of Siberian platform.38 The petrology and geochemistry...a polymict xenolith from the Kimberley Area, South Africa......40 Eclogites from the Mir kimberlite, Russia:...megacrysts from the Lace (Group II) kimberlite, South Africa..........52 Isotope composition of the sub-continental

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 00:58:06

Go to top of page

Majorite from Helam Mine, Swartruggens, Kgetlengrivier Local Municipality, Bojanala Platinum District Municipality, North West, South Africa

Majorite from
Helam Mine, Swartruggens, Kgetlengrivier Local Municipality, Bojanala Platinum District Municipality, North West, South Africa