 | | 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) | | quartz (clear auartz with hair-like crystals of rutile) have been found in Georgia at the fo'lowing localities:...combustion. Bright red hematite (red ocher) is also found with the sulfur, the red and yellow making a...pebbles), carnelian (red pebble), chalcedony (gray pebbles), jasper (red, brownish red, and yellow brown...Kansas. Kentucky—Almandite garnet occurs in small red crystals in the peridotites near Fielden, Elliott...from Bailey's Island, Casco Bay, Cumberland Co., Me. Mrs. Constance Trott, 36 Mt. Vernon St., Gardiner, |  | | 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 |  | | Journal (article/letter/editorial) | | 143 Permian Sandstones included garnet, zircon, rutile, tourmaline, monazite, and hypersthene, all of...and H. F. Harwooi : Dartmoor occurrences of (1) rutile, brookite, and anatase ; (2) zircon. (1) Anatase...Anatase, with less abundant brookite and scanty rutile, is common in Dartmoor stream-sands, etc. Anatase and...been found in pneumatolysed rocks, especially " red " granites, and the mode of genesis of these two...davyne-like mineral and its pseudomorphs from St. John's Island, Egypt. Two small crystals found with peridot |  | | 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 |  | | Book | | Urals, USSR (Sorbonne collection) 6 inches. Right: Rutile in quartz, lbitiara, Bahia, Brazil (Yves Gillet...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...to the presence of fine internal channels or to rutile inclusions. The stones in which this phenomenon |  | | 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 | | less. The “absorption spectrum” produced except red and green light and through when white light passes...through a gem¬ the filter a true emerald appears red while stone can be viewed using an instrument imitation...colour. A ruby coloured by radiation chromium and a red almandine garnet although these may fade with time...colour, for example. Pyrope of the stone for a red ray, which is refracted garnet is moderately magnetic...which is refracted separated from non-magnetic red spinel. most. Diamond has a dispersion of 0.044 |  | | 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 (article/letter/editorial) | | included in ct-zoisite are of primary nature, e.g. rutile and garnet (Vogel, 1967). The formation of kelyphitic...for Ca, Si, and A1 (Ii and Shindo, 1979). St John's Island olivine was taken as a standard for Fe. Spot |  | | 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) | | 1200 °C. Also from this region come some of the red 3 Aquamarine, tourmaline, chemical conditions necessary...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...Obviously if the gemstone is red, it cannot be an emerald. But there are many red gemstones, so it may not...colours or shades of the Chromium gives the intense red of ruby and same colour. This effect is called pleochroism |  | | 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...lakes, or in the sea. The majority of sediments are marine, i.e. deposited in the sea. Residual formations...material from a volcanic eruption gets deposited on the sea-bed, tu.Ifs are formed. These should really be classed |  | | Book | | Mountains. Since its two color states, green and red, were the same as the host country's military colors...deposits were found in Ceylon (now Sri Lanka), the island nation to the south of India. Later on, Brazil...famous for changing color from green in sunlight to red in incandescent light, few alexandrites actually...while those in larger stones are bluish. As for the red, the gem buyer compares it to the violet color of...turned from a deep green to a luscious raspberry red. THE JOYS AND SORROWS OF PLENTY There are other |  | | Journal (issue) | | (translated b y Carol Stockton) 191 Gem Garnets in the Red-to-Violet Color Range D. Vincent Manson and Carol...Koivula Managing Editor Alice S. Keller 1660 Stcwart St. Santa Monica, C A 90404 Telephone: ( 2 13) 829-2991...organization for the jewelry industry, 1660 Stewart St., Santa Monica, CA 90404. Any opinions expressed...exported to Egypt during the predynastic period as well as all early dynasties. In Egypt, however, objects...tetrahedra are linked at their four apexes to form red. Thus the blue color, which usually increases six |  | | Journal (issue) | | ARTICLES 2 Zabargad: The Ancient Peridot Island in the Red Sea Edward Gu belin 9 Cubic Zirconia: An Update...Managing Editor Alicc S. Keller 1660 S t c w a r t St. Santn Monica, CA 90404 Telephone: (213) 829-299...organization for the jewelry industry, 1660 Stewart St., Santa Monica, CA 90404. Any opinions expressed...1981 1 ZABARGAD: THE ANCIENT PERIDOT ISLAND IN THE RED SEA By Edward Giibelin Reflecting on his 1980...provides 11ti update o n this relatively u n k n o w n island and the bcarrtiful peridots for w h i c h i t has |  | | Journal (article/letter/editorial) | | t e d . Gunnar Bjareby, 147 W o r t h i n g t o n St., Boston 15, Mass. EXCHANGE — Copper arsenates and...i n g material. John Parnau, 1 3 4 2 N . Lincoln St., Stockton, Calif. STAMPS W A N T E D , U.S. A N...t e l l a at 40(Z a lb. or 100 lbs. at 2 0 g lb. Red desert agate at $ 1 . 0 0 a lb. Tell me your needs...needs in rocks. Steve J . Jackovich, 1030 Arapahoe St., Rock Springs, W y o m i n g . ROCKS A N D MINERALS...Enterprises, Box 92C, A i d more, Okla. FOR SALE (TEXAS RED C R I N O I D FOSSIL R O C K — Y o u w i l l hfive |  | | 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 (edition) | | Madras, for $100,000! Thomas had pass from a to sea, in the took over the valuable diamond. Later ...of the things a for. Not a Ruby a ring with a red gemstone in it in a jeweler's window, you probably...you have heard the familiar rhyme: Rubies are red, Sapphires are blue, Diamonds And The rhyme are...later. see a good museum's not only are rubies red but so are and even diamonds. how can you another...to recognize the slight difference between the red of a ruby and the reds of garnet and tourma- line |  | | Book | | the sc:co11d ill11stratio11 011 this page, fine rutile needles are ohsc:nc:d thm11gh the microscope i11...the excavations of archaeologists in i\lexico, Egypt, and \le opotamia. To those who are ahle to exÂ...in the illustrious ages when the old rulers of Egypt w ·re flourishing in th ir splendor. Careful research...stones: 1. Coarse crystals or long slender needles of rutile, sometimes even the peculiar knee-twins may be...interesting of these inclusions are the rutile and the zircon inclusions. Rutile needles appear chiefly in sapphire |  | | 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...im orphite, blue botryoidal, M exico $15 to $30. Rutile, Graves Mtn., GA. $10 to $35. Byssolite Needles...by F M members. Ed. CALVIN MITCHELL FARM DeKalb, St. Lawrence Co., New York by George Robinson This famous |  | | 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 |  | | 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 |  | | 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 |
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