 | 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 |  | | Journal (article/letter/editorial) | | limestone quarries of Canaan, Litchfield Co., Conn., tremolite is found in large snowy-white masses ROCKS AND...make beautiful specimens. Beautiful though this tremolite may be, it is made up of extremely fine needlelike...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 |  | | Journal (article/letter/editorial) | | ULTRAMAFIC ROCKS FROM THE CENTRAL EASTERN DESERT, EGYPT M. HAMED HATHOUT Geological Department, Faculty...Education, Menoufia University, Shebin El-Kom (Egypt) (Received January 8, 1982; revised and accepted...ultramafic rocks from the central Eastern Desert, Egypt. Chem. Geol., 39: 65--80. Nine rare-earth elements...in the Qena Quseir area, central Eastern Desert, Egypt. On the basis of field relations, bulk-rock composition...r t l y a l t e r e d r o c k s (St. J o h n ' s Island, R e d Sea). S t r u c t u r a l l y , t h e |  | | Journal (article/letter/editorial) | | 00100-X Water-rock interaction on Zabargad Island, Red S e a - - A case study: I. Application of the...3, 1995) Abstract--Zahargad Island is an uplifted fragment of Red Sea lithosphere. The main litbo~nheric...litbo~nheric unit of the island is constituted by exceptionally fresh peridotite. Fractured portions of the...halite). INTRODUCTION the floor of the Red Sea, north of the island). Motion of the faults occurred at shallow...doleritic dykes took place. On the island of Zabargad (St. John) in the Red Sea, the fresh peridotitic masses |  | | 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) | | ferrobasalt and uplift of ultramafic rocks to above the sea-level which is suggested by detritat ultramafics...serpentinites - Evidence of a fossil transform fault On the island of Tviberg (Fig. 1) there is evidence for the existence...dykes are exposed on the SE and W coast of the island. The dykes strike E-W to NE-SW and have shallow...clinopyroxene, altered plagioclase and actinolite/tremolite pseudomorphs after olivine. High-MgO metabasalt...parallel S~ foliation. During the next phase (D2), the St cleavage was refolded in asymmetrical, southeast-verging |  | Vannucci, R., Shimizu, N., Piccardo, G. B., Ottolini, L., Bottazzi, P. (1993) Distribution of trace elements during breakdown of mantle garnet: an example from Zabargad. Contributions to Mineralogy and Petrology, 113 (4) 437-449 doi:10.1007/bf00698314 | Journal (article/letter/editorial) | | HFSE anomalies. Progressive upwelling during the Red Sea rifting produced incomplete reaction under pl-facies...deep-seated tholeiitic magmatism unrelated to the Red Sea evolution, thus representing the earliest event...In the northern sector of the Red Sea, the Island of Zabargad (St. John's) exposes very fresh mantle peridotites...Zabargad Island represents an uplifted fragment of the continental lithosphere of the northern Red Sea (Bonatti...1990, 1991). Progressive upwelling during the Red Sea rifting stage, however, produced incomplete recrystallization |  | | 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 (issue) | | ·· ·································· 284 No TREMOLITE AT LOCKPORT, N. Y. .............................rtJ/'tclif!t • rti,lt s. ROCKS and MINERALS, 157 WELLS ST., PEEKSKILL, N. Y. U. S. A. The official Journal...Idaho, at the home of Frank S. Zimme.rman (42~ N. 6th St.) and with Mr. Zimmerman, are to visit a number of...Herbert Grand-Girard, PublicityOiairman 817 Mulford St., Evanston. Ill. (See pages 270, 303 and 335) Sept...TRIPS FOR PENNSYLVANIA L. J. Duersmith, 933 Spruce St., Columbia, Penn., would conduct a number of field |  | | 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 |  | | Journal (issue) | | naming was largely based on their colour. Thus all red stones were thought of as some inferior form of ruby...gemmological nomenclature. Since about 1979 orange-red coloured garnets have been offered in the gemstone...it now reaches the market enhanced by heat. The red ruby coloration is not affected by heat, but undesirable...Gems & Gemology (Vol. 16, p. 194) the testing of a red-orange natural sapphire in which most of the colour...a full range of diffusion colours from orange to red to pink. At that time we did not anticipate seeing |  | | 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 | | 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 (edition) | | Greece, minerals have formed by the reaction of sea water with slags of lead ores. The slags were produced...more than 2,000 years ago and were dumped into the sea: are the Laurium minerals man-made, or are they natural...ions). In metals, atoms are positive ions in a "sea" of loosely held electrons. In covalent bonding,...Greenish-black Red Scarlet Hematite Limonite Black, brown, red Brownish yellow Red Rusty yellow-brown...Black Siderite Brown, green White Zincite Deep red Orange Test for streak—the color of a powdered |  | | Book (edition) | | seldom faceted, and then only for collectors. Its red color is one of the richest in the mineral kingdom...Limestone-chemical precipitate of calcium carbonate in sea water. Sometimes the fossil remains of large reefs...colors. T he difference in refractive index for red vs. blue light in a diamond is quite large. As light...subtracted. Consequently. t.f a matenal absorbs red, orange. and most of the yello\.\' from the original...appears to us as a blue-green color. A ruby appears red to us because 1t absorbs much of the blue and green |  | | 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 | | encrustations can be removed with HF. Gypsum. Any clay st icking to the crystals can be washed off with water...Evaporation of saline lakes, or enclosed arms of the sea, gives rise to salt deposits termed 'evaporites'...give serpentines, forsterite, spinel and the tremolite-actinolites. Igneous rocks rich in olivine are...or beryl. Here the presence of chromium gives the red (ruby) and the green (emerald) respectively. In some...corundum (Al 0 by chromium (Cr 0 This gives the red of ruby, since chromium is a colour-giving substance |  | | 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. |  | | Book | | 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...differential thermal analysis, spectral analysis, infra-red spectroscopy, electron microprobe, scanning electron... rocky river and brook beds, rockbound lake and sea coasts, caves, erosion furrows originating after |  | | 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 |  | | Journal (issue) | | COVER: 'The large deposil of dislinctive orange to red ''fie" opols ot Queretoro, Mexico, is believed to...John Sinkanlias Editor Alice S. Keller 1660 Stewart St. Santa Monica, C A 90404 Telephone: (800) 4 2 1-7250...organization for the jewelry industry, 1660 Stewart St., Santa ~Monica,CA 90404. Postmaster: Return undeliverable...undeliverable copies of G e n s d Gemology to 1660 Stcwart St., Santn Monica, CA 90404. Any opinions expressed...McClure. violet blue, b = violet, and c = brownish red, respectively, for typical violetish blue tanzanite) |  | | 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 |
|
