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| T H E STORY OF OPAL By G. FREDERICK SHEPHERD Technical Assistant In Geology - (1932) Museum of Science...Science and Industry, Chicago, Illinois Opal An Evil Omen? It is most deplorable that the mind of the...the mag nificent and ever-changing beauty of the opal to be maligned with puny super stition. Many objects...misunderstanding, ungrounded re port, or superstition, and the opal is one of them — with little, if any, reason for...for the spread of its ill-fated powers. The opal has not always been thought of as being unlucky, and it |
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| for all the family. Australia is renowned for the world's finest Opal. But opal is not the only gemstone...masterpiece in itself. 1 OPALS "And lo! the beautiful opal That rare and wondrous gem Where the Moon and Sun...Wilcox In the first century A.O. Pliny wrote of the Opal, ". . . For in them you shall see the living fire...gems. Queen Victoria so loved the Australian Opal and made Opal popular by presenting one to each of her...mysterious "life", the Opal has been subjected to superstition and myth . Opal was said to ward off diseases |
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| : '. . ' ~ L . ..... Australia is renowned for the world's finest Opal. But opal is not the . ,. . . ...masterpiece in itself. 1 OPALS "And lo! the beautiful opal  That rare and wondrous gem  Where the Moon and...Wilcox in the first century A.D. Pliny wrote of the Opal, "... For in them you shall see the living fire...gems. Queen Victoria so loved the Australian Opal and made Opal popular by presenting one to each of her...mysterious "life", the Opal has been subjected to superstition and myth . Opal was said to ward off diseases |
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| List of Papers, p. 7. Australia generally New South Wales Victoria : Queensland Subject Index, p....Index, p. 60; : Subject Index, p. 86 : Western Australia Locality Index, p. 75. Locality Index, p. 95...95. ; Subject Index, p. 102; South Australia: Tasmania: : . Locality Index, p. 110. Subject Index...a different name. Agam, in a new country like Australia, it is often necessary to christen a new mining...occurrences. A case in point may be cited from South Australia. Wulfenite is recorded from “ Mount Lyndhurst |
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| mmigration Ol ice. Opal Mines, Wbite Cllifs, New South Wales. Oourte8JI Special Opal Nuinber Granite and...1Iuseum. B y 1rilli<1m F. Foshag The Geology of Opal. By, Oilb rrt Hart.. . . . . . . . . . . . . . ...Quest of the Opal. B!I If. T. Strnng.. . ....................... . . ('(}Jor Play in Opal. B.11, Il. E... . . . . . . . . . . . . . . . . . . . . . 'fbe Opal. JJy E11,qe11e Jr. B1"11k..................... ...Nature, Oc·cune11ce anll U se. By ,John Jfe11111.sr Opal from the Columhin Plateau Basnlt F lows of ,vashington |
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| RUBY. Etruscan: also Greek (480-300 B.c.). 500 B.c. OPAL. Described by Onamacritus: also Early Roman Empire...garnet, labradorite. magnesite,marcasite,mica, opal,soapstone and proba,bly utahlite and also others...emerald mines probably found. •oo A.D. Hungarian opal deposits probably worked: certainly operating •... r,8or-r,0oo A.D. x8oa. Del Rio describesfire opal of Zimapan, Mexico. About x8o5. Amber found in Russia:...Brazil, diamond mine found by old slave woman. 1835. Opal found near Queratero, Mexico, but only systematically |
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| Contents 4 Map: Notable Opal Localities 50 BY BRUCE PAUL GABER 6 The Opal Enigma: Science, History...and Pins Afire: Play of Color in Opal BY MAX WEIBEL Sparkling Opal in Ancient Bones: Precious Relics...vibrant with opal pattern and color. In this extreme close-up of a Lightning Ridge black opal, the field...approximately 3 mm wide. Opal courtesy Jenni Brammall BY ALEX RITCHIE 52 An Opal Glossary of Terms BY...BY SI AND ANN FRAZIER BY PETER HUBER 64 Opal from Mexico: Unsurpassed Fire BY JURGEN SCHUTZ 18 Perfect |
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| Letters FEATURE ARTICLES 4 16 p. 11 Queensland Boulder Opal Richard W . Wise Update on Diffusion-Treated...Suggestions for Authors ABOUT THE COVER: Australia is the world leader in opal production. Some of the most attractive...state of Queensland. The article by Richard Wise in this issue provides on overview of Queensland boulder...boulder opal, with specific information from an active operation, the Cragg mine. The oplrls illustrated here-shown...here-shown on a classic opal-bearing Queensland boulder-all have some of the ironstone matrix as a backing |
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| 480 La Trobe Street Melbourne, Victoria 3000, Australia Nelson Canada 1120 Birchmount Road Scarborough...Formed from Surface Water: 19 The Opals of Australia PART II Gemstones of Igneous-Hydrothermal Origin...129 The Diamond Deposits of Argvle, Western Australia Index 141 FOREWORD Each gem deposit-whether...agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted to those... Egypt and the new find at Argyle in Western Australia are used as examples. It is worth noting that |
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| 480 La Trobe Street Melbourne, Victoria 3000, Australia Nelson Canada 1120 Birchmount Road Scarborough...Formed from Surface Water: 19 The Opals of Australia PART II Gemstones of Igneous-Hydrothermal Origin...129 The Diamond Deposits of Argvle, Western Australia Index 141 FOREWORD Each gem deposit-whether...agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted to those... Egypt and the new find at Argyle in Western Australia are used as examples. It is worth noting that |
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| CLASSIC MINERAL LOCALITIES OF THE WORLD Asia and Australia = _ |) VieBAtO TATA JARS LIPOW Si. ao sé ... CLASSIC MINERAL LOCALITIES OF THE WORLD Asia and Australia Philip Scalisi David Cook VAN NOSTRAND REINHOLD...Nostrand Reinhold Australia Pty. Ltd. 17 Queen Street Mitcham, Victoria 3132, Australia Van Nostrand Reinhold...Classic mineral localities of the world, Asia and Australia. Bibliography: p. Includes index. 1. Mines and...resources—Asia. 2. Mines and mineral resources—Australia. 3. Mines and mineral resources—Soviet Union |
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| indicated that neither cement absorbed in this region of the spectrum. Luminescence. Four of the 23 core...corre- GEMS & GEMOLOGY Winter 1997 sponds to the region of absorption from 400 to 425 nm seen with a hand...moissanite is much less transparent in the ultraviolet region than nearcolorless diamond is. For example, it...moissanite has no sharp bands, but does show a region of intense absorption beginning at about 425 nm...and extending into the ultraviolet. It is this region of absorption, absent in the spectrum of diamond |
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| LTD. DURBAN : 33/35 Beach Grove AUSTRALIA: BUTTERWORTH & CO. (AUSTRALIA) SYDNEY : 6/8 O’Connell Street...of the Silica Group including Amethyst, Agate and Opal 11 Turquoise and Lapis-Lazuli ize The-Jades...: : : : : . 166 XVI XVII Opal: Cabochon-cut Stones and a Faceted Fire Opal . So Cabochons of Ornamental...interference of transmitted light rays gives to the opal its unique appearance. Reflections from regularly...emerald, sapphire and pearl, with perhaps black opal and alexandrite. All of these are stones in fairly |
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| 22 23 24 25 26 27 28 29 30 31 Spodumene Quartz Opal Turquoise Lapis Lazuli Jade – Geology and Mineralogy...to note that these include contributors from Australia, Canada, Germany, Thailand, Vietnam, the UK and...Gemstones’ becoming ‘Colour and Colour Enhancement’, and ‘Opal’ xiii Preface to the Fifth Edition being extracted...Pierre Gilson including, most importantly, synthetic opal, both white and black, and a corresponding ingenuity...stone’, a special type of glass closely resembling opal in appearance. Quartz, which for many years has |
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| 2. Brazil .... 3. South Africa 4. Borneo 5. Australia 0. North America 7. British Guiana 8. Urals ....Melanite, Topazolite . Tourmaline Opal Precious opal . Fire-opal Common opal . Turquoise . Bone-turquoise... . 330, 338 cut Precious opal, rough : Australia 375, 382 Fire-opal, rough „ Brazil PLATE XVII... .... cut.384 331, 336 ., 426 FELSPAR AND OPAL Fig. 1. „ 10. 331 372 372 3. . . . . PLATE...deposited as calcite, and the latter as silica (opal), and various aluminium hydroxides (diaspore, gibbsite |
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| Tourmaline and Zircon Quartz, Agate and Chalcedony Opal Peridot, Sinhalite, Zoisite and Spodumene 9 page...and tourmaline H. Zircon I. Quartz group J. Opal K. Chalcedony group L. Jade minerals M. Lapis...may form later in crevices of sedimentary rocks—opal and turquoise being good examples. 28 OCCURRENCE...being discovered in Bahia in 1844. It was in this region that the tough black granular form of diamond known...influenced by the nature of the stone. In the case of opal, the nearly flat or ‘tallow-topped’ shape is preferred |
