 | | Journal (article/letter/editorial) | | Harris Syngenetic inclusions in diamond from the Birim Ā®eld (Ghana) Ā± a deep peridotitic proĀ®le with...inclusions from placer deposits (Akwatia mine) along the Birim River, Ghana were studied, thus providing...contents indicate an almost exclusively peridotitic diamond suite, with the vast majority being part of the...harzburgitic paragenesis. Chemically the Akwatian diamond inclusions diĀer from those in our 1100 sample...(66.4 mol%) so far observed in an inclusion in diamond. The same garnet also contained a minor enstatite |  | | Journal (article/letter/editorial) | | early 18th century and that Brazil was the main diamond producer in the world until 1870, the knowledge...Tompkins, 1994). These discoveries show that primary diamond sources exist in Brazil, but so far their small...placer deposits, and perhaps additional primary diamond deposits may be found in Brazil. If they exist...inclusions. Considering the extent of alluvial diamond sources in Brazil, previous studies of this type...Brazil have been published. One exception is the diamond suite from the Juina area, which includes the original |  | | Journal (article/letter/editorial) | | of starting compositions for the forsterite-magnesiochromite system to derive a PāX phase diagram and synthesize...contain olivine with small chromium content and magnesiochromite. Mg2SiO4 wadsleyite is characterized by the...xenoliths, and UHP podiform chromitites. Keywords: Magnesiochromite, forsterite, olivine, wadsleyite, ringwoodite...spinel (Meyer and Boyd 1972; Sobolev 1974). Magnesiochromite (MgCr2O4) is an important end-member of chrome...falling between the forsterite Mg2SiO4 and magnesiochromite MgCr2O4 end-members were prepared. The experiments |  | | Book | | (Mg3Cr2Si3O12) Lherzolite Majorite (Mg4Si4O12) Magnesiochromite Mg(Mg,Cr)(Mg,Si)O4 phase with modiļ¬ed calcium...huge amount of data has been accumulated in the field of high-pressure mineralogy to date (Agee 1998;...Inclusions in diamond from the K14 and K10 kimberlites, Buffalo Hills, Alberta, Canada: diamond growth in...Lithos 77:99ā111 References 3 Harte B (2010) Diamond formation in the deep mantle: the record of mineral...diamonds from Sao Luiz, Brazil. Mantle Petrol: Field Observations and High Pressure Experimentation: |  | Wijbrans, C. H., Niehaus, O., Rohrbach, A., Pƶttgen, R., Klemme, S. (2014) Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements. Physics and Chemistry of Minerals, 41 (5) 341-346 doi:10.1007/s00269-013-0653-x | Journal (article/letter/editorial) | | particular, Cr-rich garnets are commonly found in diamond inclusions and in deep-seated mantle xenoliths...often found in diamond-bearing mantle xenoliths and are also used as a so-called diamond indicator mineral...mineral in the diamond exploration industry (Cookenboo and Grutter 2010). However, the stability of Cr-bearing...magnetic field strength of 10 kOe. The inset shows the magnetic susceptibility in zero-field- (ZFC) and...and field-cooled (FC) mode at 100 Oe Fig. 3āāMagnetization isotherms at 3, 10 and 50 K for Mg3Cr2Si3O12 |  | Bindi, Luca, Sirotkina, Ekaterina A., Bobrov, Andrey V., Nestola, Fabrizio, Irifune, Tetsuo (2016) Chromium solubility in anhydrous Phase B. Physics and Chemistry of Minerals, 43 (2) 103-110 doi:10.1007/s00269-015-0777-2 | Journal (article/letter/editorial) | | materials and prepared for the composition magnesiochromite (SpāMgCr2O4)āforsterite (FoāMg2SiO4) Sp10Fo90...GrtāAnh-BāmLd triangle, so that the lowest magnesiochromite (MChr) content in the starting material should...partial melting in the spinel peridotite stability field. Cr-rich garnets would crystallize from such compositions...compositions during subduction into the garnet stability field. Although it is not possible to estimate the likely...Funakoshi K (2004) Formation of pure polycrystalline diamond by direct conversion of graphite at high pressure |  | | Journal (article/letter/editorial) | | Switzerland Keywords Majorite Ā· Garnet Ā· Chromium Ā· Diamond inclusions Ā· Depleted mantle Ā· Transition zone...peridotites (for instance in the Western Gneiss region of Norway), samples are found which contain garnets...(Haggerty and Sautter 1990). While rare, majoritic diamond inclusions are reported from cratons all over the...websteritic. A number of majoritic garnets from diamond inclusions are also plotted in the diagram (for...interpretation for the origin of the deep eclogitic diamond inclusions is that they are derived from subducted |  | Smith, Chris B., Pearson, D. Graham, Bulanova, Galina P., Beard, Andrew D., Carlson, Richard W., Wittig, Nadine, Sims, Keith, Chimuka, Lovemore, Muchemwa, Ellah (2009) Extremely depleted lithospheric mantle and diamonds beneath the southern Zimbabwe Craton. Lithos, 112. 1120-1132 doi:10.1016/j.lithos.2009.05.013 | Journal (article/letter/editorial) | | Keywords: Lithospheric mantle Peridotite xenoliths Diamond Kimberlite macrocrysts Zimbabwe a b s t r a c...low Ca, high Cr garnet. Sulphide inclusions in diamond produce minimum TRD model ages of 3.4 Ga indicating...evaluating the diamond content of these pipes. Forty seven mantle xenoliths were obtained from diamond drill core...SEMQuant (ZAF4) program. All metal marks from diamond sawing were abraded using corundum paper followed...aluminous chrome-spinel (down to 19.6% Cr2O3) to magnesiochromite (up to 65% Cr2O3) (Fig. 2a, b). The more Cr-rich |  | | Journal (article/letter/editorial) | | Greenland, including their mantle constituents, diamond occurrence, age and provenance Mark T. Hutchison...Keywords: Kimberlite Aillikite Orangeite Carbonatite Diamond Mantle geotherm Greenland Garnet Lake a b s t...Greenland lamprophyric rocks and from well within the diamond stability ļ¬eld. Diamonds are typically colourless...conditions exhibited by mantle xenoliths, calculated diamond formation ages peaking around 583ā593 Ma are favoured...complex. A model of mantle refertilisation and diamond formation culminating in conditions favourable |  | | Book | | 20 Three-Stage Growth Model of the Natural Diamond of Octahedral Habit. 23 Petrography and mineralogy...Experimental Study of Growth and Resorption of Diamond in Kimberlitic Melts at High Pressures and Temperatures...crystalline inclusions and the real structure of diamond. Morphology and Composition of Chromite Macrocrysts...Inclusions, Guaniamo Kimberlite Field, Venezuela. Primary and related diamond occurrences within a Phanerozoic...Phanerozoic subduction regime in eastern New South Wales, Australia. Mantle Dynamics beneath Mongolia: Implications |  | | Journal (issue) | | determining the geographic origin of gem-quality diamond, which are based largely on trace element and isotopic...determining the provenance of a random individual diamond. 290 Sapphire Beneath the Rich Black Soil of...Notes Exceptional fancy red diamond ā¢ Treated ānickel-richā green diamond ā¢ Gota de aceiteālike effect...moissanite ā¢ Synthetic moissanite presented as natural diamond rough ā¢ Catās-eye ParaĆba tourmaline with copper...inclusions p. 359 364 G&G Micro-World Breyite in diamond ā¢ āSurpriseā in elbaite tourmaline ā¢ Unusual purple |  | | Book | | Top 6 7 1 Top Bottom Bottom 3 4 5 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...SME diamond_title2 9/3/02 9:29 AM Page 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...CHAPTER 1 HISTORY OF DIAMOND DISCOVERIES 1 Introduction 3 History of Diamond Discoveries References...References 29 CHAPTER 2 DIAMOND MORPHOLOGY 3 3 33 General Properties and Internal Structure Crystal Habit...Habit 37 Varieties of Diamond 38 Dissolution Phenomena 44 References 46 CHAPTER 3 AGE AND ORIGIN OF DIAMONDS: |  | | Book | | extensive guide to the scientific literature in this field. This book will be valuable to a wide readership...illustration: A ruby, sapphire, emerald, citrine and diamond clip, mounted by Cartier, Paris, 1940, deĀ¬ signed...Fashioning of diamond Other stones 108 108 116 7 7.1 7.2 Gemstones in commerce Diamond grading Buying...the book all the journals and monographs in the field have been consulted so that the book should stand...rarity. These terms are to some extent flexible: diamond for example is very rare indeed compared to salt |  | Kogel, Jessica Elzea, Trivedi, Nikhil C., Barker, James M., Krukowski, Stanley T. - Eds. (2006) Industrial Minerals and Rocks (7th ed.) Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO. | Book (edition) | | . . . . . . . . . . . . . . . . . . . . . . . . Mine Safety and Health Law . . . . . . . . . . . . ....admiration for his countless contributions to the field of industrial minerals, we dedicate this 7th edition...the professional development of geologists in the field of nonmetalliferous geology. Robert Dreyer received...Ray E. Harris G.E. Dolbear and Associates, Inc. Diamond Bar, California Todd S. Harris New Jersey Geological...represent a consensus of many professionals in the field as to what defines the scope of industrial minerals |
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