 | | Journal (article/letter/editorial) | | Hydrothermal Alteration of Peridotite, Zabargad Island (Red Sea) by F. BOUDIER AND A. NICOLAS Laboratoire Tectonophysique...France INTRODUCTION Zabargad Island on the Egyptian margin of the Red Sea has been intensively studied...be related to the early stage of rifting of the Red Sea (Bonatti et al, 1983,1986; Nicolas et al, 1985...intrusions observed along the Arabian margin of the Red Sea (Sebai et al, 1987; Coleman & MacGuirre, 1988)...that time continuous between the two sides of the Red Sea. This interpretation fits the Zabargad data well |  | | Journal (article/letter/editorial) | | granulite gneisses of Zabargad island: implications for the early stages of the Red Sea rifting JoEl R . L a n...Previous geochronological results obtained on Zabargad island and AI Lith and Tihama-Asir complexes (Saudi Arabia)...mantle diapir during the early opening of the Red Sea rift. In contrast, Sm-Nd and Rb-Sr internal isochrons...Afro-Arabian shield. During early stages of the Red Sea rifting in the Miocene, these Precambrian granulites...peridotite diapir. 1. Introduction Z a b a r g a d island ( 2 3 ° 3 6 . 5 ' N , 3 6 ° 1 2 ' E ) is located |  | Kurat, G., Palme, H., Embey-Isztin, A., Touret, J., Ntaflos, T., Spettel, B., Brandst�tten, F., Palme, C., Dreibus, G., Prinz, M. (1993) Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt. Mineralogy and Petrology, 48 (2) 309-341 doi:10.1007/bf01163106 | Journal (article/letter/editorial) | | Peridotites and Associated Vein Rocks of Zabargad Island, Red Sea, Egypt* G. Kurat 1, H. Palme 2, A. Embey-Isztin...March 31, 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies,...Meet, Agypten Auf der Insel Zabargad (St.John's Island) im Roten Meer befinden sich drei PeridotitK6rper...Welt sehr/ihnlich. Die am st~irksten verarmten Peridotite scheinen aueh die st/irksten metasomatischen...Introduction Zabargad (St. John's) Island is located near the central trough of the northern Red Sea at about 23°36 |  | | Book | | Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot Deposits 9. Diamond Pipes: 129 The...respectively. The classic peridot of Zabargad Island, Egypt and the new find at Argyle in Western Australia...Australian opal mining. Photographs of Zabargad Island were generously provided by Dr. Peter Bancroft...of all placer deposits are found on the tropical island of Sri Lanka (formerly Ceylon), without doubt,...coast of India. It has commonly been called the "island of gems" because of the large and spectacular array | | | Book | | Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot Deposits 9. Diamond Pipes: 129 The...respectively. The classic peridot of Zabargad Island, Egypt and the new find at Argyle in Western Australia...Australian opal mining. Photographs of Zabargad Island were generously provided by Dr. Peter Bancroft...of all placer deposits are found on the tropical island of Sri Lanka (formerly Ceylon), without doubt,...coast of India. It has commonly been called the "island of gems" because of the large and spectacular array |  | | Journal (article/letter/editorial) | | Relative to Si metal Analysing crystal Mineral Cordierite \ Anorthite 1 Bronzite j Enstatite J Quartz Wollastonite...intensity of the line Mineral Corundum Al metal Cordierite Jadeite Sillimanite Topaz Garnet Anorthite No...S\KCordierite Sillimanite Enstatite Olivine Garnet Jadeite...ZjA and Z without calculating individual values of St. A modified form of this equation was used by Smith...Duke University on December 13, 2012 where Q and St are the concentration and stopping power of the /-th |  | | Book | | been included in this book: for example, zircon, cordierite, kornerupine, sinhalite, jade, etc. However,...which are mainly black on the surface, but pink to red at a depth; the same is true of rhodonite and rhodochrosite...usually colorless, but they can be yellow, green, red, brown or opaque, in which case they are of industrial...some colored, transparent varieties: of these the red ones are rubies, and the blue, sapphires. Other colors...this remarkable feature. The color is variable: red spine! - the kind most commonly used in jewelry - |  | | Book (edition) | | Benitoite 55 About the authors 4 Iolite (cordierite) 55 Is it a gem? 5 Andalusite, Fibrolite...1200 °C. Also from this region come some of the red 3 Aquamarine, tourmaline, chemical conditions necessary...aluminous shales to slates containing garnet, iolite (cordierite) or andalusite. Fluids right Amethyst crystals...and vacuum equipment collect diamonds from the sea crushed. At the end of the journey, although the...2000 that use a crawler to mine horizontally on the sea bed. One area where diamonds have been concentrated |  | | Journal (issue) | | may also take on shades of black, brown, green or red or combinations of all these colours. m VARIETIES...section through an agate nodule showing alternate red and white bands (Brazil). Below: Agate pebbles from...are often, but not always, coloured with alternate red and white bands. Historically, the most famous source...plentiful deposits of agate have been found in China, Egypt, the Italian Alps, Madagascar and Mexico. Agate...colourless, although various shades of brown, grey, pink, red or yellow may also be found in limited areas. The |  | | Book | | tangled mass of fine, blackishgreen needles with shiny red grains between them. The freshly fractured surface...name to you. The green needles are hornblende, the red grains are nothing else but garnets, the same 'garnet'...choice of three colors: black, red and yellowish-brown. Two of these, red and yellowish-brown, were supplied...staurolite, garnets, epidote, zircon, tourmaline, cordierite, sillimanite, augite, hornblende, talc, muscovite...lakes, or in the sea. The majority of sediments are marine, i.e. deposited in the sea. Residual formations |  | | Journal (article/letter/editorial) | | Boakite. A trade name for a brecciated green and red jasper. R. Webster, Gems, I962, P. 753. Bombollalite... Acta, 54, 1112. The 'IO A Manganite' from deep-sea nodules described by W. Buser (in Oceanography, Amer...[M.A. 15-352.] Creolite. A superfluous name for a red and white banded jasper from California. R. Webster...unspecified green and white rock from Vancouver Island, British Columbia. R. Webster, Gems, 1962, p. 755...An objectionable trade name for artificial light-red corundum. R. Webster, Gems, I962, p. 755. Not to |  | | Book | | tombs. Lapis was im¬ ported from Turkestan into Egypt nearly ten centuries before Moses led the Hebrews...the absorbed colors. A ruby, for example, appears red because it absorbs blue, yellow, and green wavelengths...in most jewelry shops. To most people garnet is a red gem, yet it occurs in shades of purple, orange, pink...Jade is not only green, but can be blue, purple, red, brown, gray, white, or yellow. In gems, subtleties...Incandescent lamps give a light that is warm and yellowish-red, while fluorescent lamps tend to be bluish. A good |  | | Book | | F. HUME, the Pioneers of the E astern Desert of Egypt 1\1:ultum non multa Plinius ]1-1,nior CONTENTS...OF SUEZ AND THE NORTHERN RED SEA . . . . . 7 . r. Tectonic map of Egypt by N. A. Syagaev . . . ...Southern Area of the Red Sea Hills towards the Sudan border (Photogeological map of Upper Egypt by Hunting, 1967)...1967) 4. Border area between Sudan and Egypt 5. A. Stratigraphic correction . . . . . . B. Tectonics... . . . . a) Fault Zones crossing the Northern Red Sea. b) The Cairo Graben . . . . . . c) The northern |  | | Report (issue) | | 294, 1-61 (1981). Microprobe analyses (8) from Red Wine alkalic complex, Labrador. AEN1GMAT1TE. Howie...(1982)) Chem. Abstr. 97, no. 8, 58726 (1982). Infra-red spectrum. AESCHYNITE. Shabalin, (Mineral. Zh. 3,...(1982)) Chem. Abstr. 97, no 8, 58726 (1982). Infra-red spectrum. AFGHANITE. Leoni et al., (Rend. Soc. Ital...(1982). Synthesis by hydrolysis at 60°. X-ray, infra-red data. AKAGANEITE. Gonzalez-Calbet et al., (J. Inorg...no. 22, 184683 (1981). Synthesis, x-ray and infra-red data. AKAGANEITE. Nagai et al., (Ferrites, Proc. |  | | Report (issue) | | StrCl:t, Edinbarrh· • \',;,rk Street, Mru1chestu , ; 1, St. An~w•a Crescent, Cardiff 15, Donegal! Square West...Str-eet, Edinburgh ::a York Street, Manchester 1; 1, St. Andre\v 1s Crescent, Ca.rmff J 5, Donegall Square...84 93 96 • • Honduras United States • •• Egypt • • • • • • ••• French Equatorial Africa • •• ...back of the stone and emerge as separate rays of red, blue, yellow, and other coloured light. The brilliant...are no standards of beauty~ · Amethyst and deep red _g arnet were used in jewellery to a consider.a ble |  | | Book | | ite stones, like on green made Compos- the red garnet glass (above), are of more than one piece...erosion, are carried by rivers to lakes or the sea. SEDIMKN TARY Metamorphic Rocks ROCKS may are...tree resin, collected from soft sediments or the sea. Jet is fossilized wood, found in some sedimentary...gemstone, are still viable. Treasure from i he Sea The action of seawater has given amber {fossilized...gem may of course Japan China OO Pakistan Egypt occur in other places, but probably not in sufficient |  | | Journal (issue) | | Miller Famous Mineral Localities—Saint John’s Island, E gypt..........................................Harker, 42 Oxford St., Leicester LE1 5XW South Africa: Horst Windisch, 30 van Wouw St., Groenkioof, Pretoria...MINERALS Telephone 624-2 132 111 W. W A S H IN G T O N ST., TUCSO N, A R IZ O N A 85701 F. CURETON II & SONS...by F M members. Ed. CALVIN MITCHELL FARM DeKalb, St. Lawrence Co., New York by George Robinson This famous...467-0212 Pink a p o p h y llite , St. Andreasberg, Harz; Raspberry red rhodoch ro site , “Wolf” mine, Herdorf |  | | Book (edition) | | Natural History r PHOENIX BOOKS, LTD. 3110 N. High St. Columbus, OH 43202 268-3100 *. * « f « ...law, the parameters a',b', c ' of the face A'B'C (red) are related to a, b, c respectively by a simple...are cubic. , Hopper faces in a quartz crystal (St. Gotthard, Switzerland) Furthermore, the external...crystals of rutile. Conversely the "Greek cross" and "St. Andrew's cross" crystals of staurolite are twinned...with electrified sulfur (yellow) and minium or red lead (red) powder. The polarity CALCITE FLUORITE APATITE |  | | Journal (issue) | | CONTENTS FEATURE ARTICLES 62 Sri Lanka: The Gem Island Peter C. Zwnan The Identification of Artificial...is one o f m a n y fine gemstones found on the island o f Sri Lanka, the subject of Peter Zwaan's article...Managing Editor Alice S. Keller 1660 S t e w a r t St. Santa Monica, C A 90404 Telephone: I2131 . , 829-2991...organization for the jewelry industry, 1660 Stewart St., Santa Monica, CA 90404. Any opinions expressed...and not of the publishers. SRI LANKA: THE GEM ISLAND By Peter C. Zwaan Sri Lanka, formerly Ceylon, |  | | Book | | largest group are further subdiv ided according to st ructure. All silicates are based on the 'silicate...Surra Burra (Australia). C Cu Colour: light rose-red on fresh surface Lustre; opacity: metallic; opaque...translucent green when ve ry thin Streak: copper-red Hardness: 2.5-3 Specific gravity: 8.93 Cleavage;...tonnes (25 tons), is mined at Ovifak and Disko Island (Greenland). Nickel-iron in the form of meteorites... USA), Jachymov and Pribram (Czech Republic) and St Marle-aux-Mlnes (France). As Colour: light grey | | | Book | | Surra Burra (Australia). C Cu Colour: light rose-red on fresh surface Lustre; opacity: metallic; opaque...translucent green when ve ry thin Streak: copper-red Hardness: 2.5-3 Specific gravity: 8.93 Cleavage;...tonnes (25 tons), is mined at Ovifak and Disko Island (Greenland). Nickel-iron in the form of meteorites... USA), Jachymov and Pribram (Czech Republic) and St Marle-aux-Mlnes (France). As Colour: light grey...often accompanying silver and arsenic. It is found at St Andreasberg (Germany), Sala (Sweden), Coimbra (Portugal) |  | | Book | | colour when held up to the light and rotated, eg cordierite and zoisite tanzanite. Such minerals are called... realgar reacts in a similar way, changing from red to light yellow; topaz changes from blue to green...heating, yellow carnelian and tiger's eye become red, green aquamarine turns blue. Recently, diamond,...eg gold - yellow, sulphur - yellow or cinnabar - red. Large differences between the true colour and the...numerous microscopic inclusions, such as opal and cordierite. Pearly lustre - typical of transparent or semitransparent |  | | Book | | fine hematite "Iron rose", 10cm across, from Fibbia, St Gotthard, Switzerland. lnstitut fur Mineralogie und...Cassiterite Cassiterite Manganite Scheelite South Africa St Andreasberg, Harz, FRG Shikoku, Japan Grube Georg...Cumberland, GB Vlb Nordmark, Sweden VI la St John's Island, Red Sea, Egypt Vllb Morawicza (Ocna defier), Banat...Kirgizia, USSR Vllb Miralani Hills, Tanzania Vllb St Andreasberg, Harz, FRG VII lb Ain Babouk, Constantine...aggregates in situ. The main mineral display is on the 1 st floor, but another 1 00 or so large specimens are |  | | Book (edition) | | purpose of closing the shell. "Adelaide ruby." Blood-red pyrope (garnet) from South Africa. adinol. A silicified...and prized by the negroes of West African coast. Red, blue akabar. agate opal. See opal agate. agate... Asia Minor. Now sometimes applied to violetish-red spinel. alabaster. translucent to semitransparent...variety of cHrysoberyl, emerald green in daylight, red to violet . by ordinary artificial light. A From...coral of inferior quality from the Mediterranean Sea. More specifically only that from the Algerian coral |  | | Journal (issue) | | SP8-100 spectrophotometer, show good transmission from red to yellow and a wide absorption band from blue to...Mössbauer Spectra of Kyanite, Aquamarine, and Cordierite Showing Intervalence Charge Transfer. Phys.Chem...green for the extraordinary ray and a deep garnet red for the ordinary ray. Complementary colours in fact...DIAMONDS THE RED STONE OF ELANDSPUTTE Among the gems recently found near Lichtenburg was a deep red port-wine...Elandsputte early in August. This is only the second red stone found in South Africa, while another was found |
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