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| Vojany, Slovakia) Head of the Department of Natural History, Eastern Slovak Museum, Košice He finished...His Ph.D. study was at the Technical University, Košice (1992). Until 1990, he worked at the Dionýz Štúr...(1983). Ph.D. study at the Technical University, Košice (2000). Since 1980, he was employed in the Herman...Poland (Ewa Kos/.owska) Romania (Gheorghe Udubasa) Slovakia (Rudolf Duda) Ukraine (Orest Matkovs'ky) 31 31...(Ewa Kos/.owska). Romania (Gheorghe Udubasa), Slovakia (Rudolf Duda). Ukraine (Victor Kvasnytsya) 127 |
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| Eur. J. Mineral. 2004, 16, 789-799 Opals from Slovakia ("Hungarian" opals): a re-assessment of the conditions...properties are investigated: X-Ray Diffraction (opal-A), Raman spectra (main Raman peak at 437 cm-1)...to 190°C. Key-words: Slovakia, gem opal, Raman spectroscopy, oxygen isotopes, opal classification. 1....Introduction The "Hungarian" opal deposits (now in Slovakia) were the unique source of gem opal in Europe from the...to understand the formation of opal deposits. This study focuses on opal properties and its relationship |
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| .......................................... 52 Slovakia ( Rudo lf Ducfa) ...............................(Ewa Koszowska). Ro mania (Gheorghe Uduba~a), Slovakia (Rudolf Ducfa). Ukraine (Victor Kvasnytsya) Native...wa especially rich in specimens from the Banal region and Gutiii Mts. (fu loppite was named in his honor)...detailed. unified mineralogical encyclopaedia of the region had been planned by the Commi!.sion on Mineralogy...Verde§ (Gold Museum. Brad) - for photography. Slovakia: Eva Sitasova (Eastern Slovak Museum. Kosice) |
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| localities for good ilmenite crystals exist in the region (Brunet, I 977b ). NEW YORK Amity, Orange County...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...Discm•t•ries, /960--20/ 5 ONTARIO Bentley Lake Road occurrence, Faraday Township, Hastings County. In fall 1994...site which they called the Bentley Lake Road occurrence, south of Bancroft. Sharp, flattened rhombohedral...specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed on the property |
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| Contents 4 Map: Notable Opal Localities 50 BY BRUCE PAUL GABER 6 The Opal Enigma: Science, History...FRAZIER 12 Classic Slovakia 14 Rainbows, Harlequins and Pins Afire: Play of Color in Opal BY MAX WEIBEL...WEIBEL Sparkling Opal in Ancient Bones: Precious Relics from the Age of Dinosaurs Facing Page: Robert A....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 |
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| from different sources, vary? What causes the occurrence of varieties? Why do diamonds, unlike other precious...through the agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted...invaluable input into the chapter on Australian opal deposits. The chapter on Colombian emeralds was...Melbourne, provided the TEM photomicrographs of opal. The South Australia Department of Mines and Energy...Energy provided the photographs of Australian opal mining. Photographs of Zabargad Island were generously |
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| from different sources, vary? What causes the occurrence of varieties? Why do diamonds, unlike other precious...through the agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted...invaluable input into the chapter on Australian opal deposits. The chapter on Colombian emeralds was...Melbourne, provided the TEM photomicrographs of opal. The South Australia Department of Mines and Energy...Energy provided the photographs of Australian opal mining. Photographs of Zabargad Island were generously |
 | | Journal (issue) |
| of brilliant terminated xis. 2 ¼ x ¾ . ... 2 .50 OPAL V. HYALITE, N. Carolina. Heavy blue incrustation.... ........................ ...... 417 AN OPAL OCCURRENCE IN ARIZONA. By Mrs. Bertha E. Schell ........area were terminated at the end of the war . The region is known to contain at lease several hundred tons...care must be exercised in mining. In the Selati district, which lies in about the middle of this area,...made from boulder. SOUTHERN RHODESIA The main occurrence of corundum in Southern Rhode ia is in a zone |
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| Petrified Wood 131 Characteristics of Agates; Opal, Queen of the Gems; Petrified Wood; Commonly Occurring...Family Gemstones The Various Names and Forms of Agate Opal and Its Varieties Recommendations for Use of Polishing...the ancient gems), calcite, fluorspar, jadeite, pyrite, quartz family minerals ( agate, carnelian, chalcedony...quartzite, rock crystal, amethyst, chrysoprase, opal, etc.), serpentine, and steatite (massive talc)...over the camel caravan routes. Meanwhile, precious opal was introduced about 4000 B.C. from mines in Kenya |
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| Wales Portion) VOLUME 2 MINERAL OCCURRENCE DATA SHEETS, AND OCCURRENCE LISTS R.E. Brown, H.F. Henley..................................... 3 MINERAL OCCURRENCE SYMBOLS .......................................deposits are illustrated on Map 1. Details of each occurrence are summarised on the following mineral deposit...affected q e x k h u g d o h r a t b v h MINERAL OCCURRENCE SYMBOLS A non-standard set of symbols has been...symbol. The symbol and occurrence number are plotted at the mineral occurrence locality on the face of |
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| ........ . Quartz monzonite porphyry.·.... . Occurrence and character .... . Petrographic details .....geology-Continued. 9 Epitome of the. geologic history of the 9 district .....•......................... 9 Part II. The... ILLUSTRATIONS. Page. I. Geologic map of the Yerington district, _ Nev ..•........ _.. _.... _.... _. . . In pocket...III. Geologic sections across the. Yerington 28 district; Nev. _. ___ .. __ .... __ . __ .. _. . . IV....Index map showing the location of the Yerington district, Nev......... . . . . . 10 · 2. Geologic section |
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| Paper 172 GOLD QUARTZ VEINS OF THE ALLEGHANY DISTRICT CALIFORNIA BY HENRY G. FERGUSON AND ROGER W...Rutile ____ _ ____ .._____.. Quartz, chalcedony, and opal Gold. ___________ _ ---____-_-__--_-_. Final st...Independence mine__-__-J__-----------Future of the district.... _____________ _^_ _______ Index, ___________'____________...ILLUSTRATIONS PLATE Fage 1. Geologic map of the Alleghany district, California._,.____-____-______-__-_______--_____-__-_--_-_-_-...Creek, 10 3. Geologic map of the region surrounding the Alleghany district-___--_--_-__.--_________--_.--____-_---_-10 |
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| districts.____-_--_-----_____-______---_ Bohemia district.._i_-_-__--_---_-_--_---___-______-_____---_--...areas and mining districts Continued. Bohemia district Continued. Mineral deposits._________________...Veins of quartz and clay minerals_____.__-___._.-__ Pyrite and cherty quartz veins._____________________ Chalcopyrite...and gold-calcite-quartz veins___________ Stibnite-pyrite-quartz veins_______________________ Specularite..._-__--_----__------__-_____________ 48 Disseminated pyrite._-------__----___-____________ Zonal arrangement |
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| mineral lazurite, often mixed with calcite and pyrite. Photo by Tino Hammid. © GIA & Tino Hammid. Petrography...molecular structure and interaction from this region. Courtesy Gene Meieran. (the behavior of the electrical...similar to granite. Specific gravity: 2.8-3.0. Occurrence: nice specimens from Kern and Tuolumne counties...sometimes discover the gem minerals beryl., corundum., opal, spodumene, topaz, tourmaline, and zfrccn. View...long. The pegmatites of PERIDOTITE the Pala district of San Diego County, rock, generally dark green |
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| III there is an elementary discussion of the occurrence, This includes a brief descripand association...(Glass and Hydrocarbons) PART 413 III THE OCCURRENCE, ASSOCIATION, AND ORIGIN OF MINERALS A. General...Verlagshandlung, Stuttgart, 1905. PART III THE OCCURRENCE, ASSOCIATION, AND ORIGIN OF MINERALS BECK (WEED):...determined, there yet remain the facts of its occurrence and association, and the problem of its origin... among which ore-deposits are prominent. The occurrence of certain minerals in certain rocks and mineral |
 | | Journal (issue) |
| emerald locality and the Novello alexandrite occurrence, this migration of beryllium-containing fluid...concentration of phosphate are likewise fulfilled in this region (marine basin, proximity of glauconitic formations...colour centres in fluorite. M.O'D. BLAIR (G.). Pyrite-collectors' delight. Lapidary Journal, 1977, 31...and occurrence of pyrite. M.O'D. BOWER (C. E.). Digging for black opals at the Royal Peacock opal mines...Lapidary Journal, 1977, 31, 2, 526-533. Opal from this region has been stabilized by a process not described; |
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| MINES With a section on the THUNDER MOUNTAIN DISTRICT By B. F. LEONARD, U.S. GEOLOGICAL SURVEY, and...______________________ Salmon River district ____________________________ Chamberlain district _____________________________..._______ Edwardsburg district _____________________________ Ramey Ridge district ____________________________...________ Big Creek district ______________________________ Middle Fork district _____________________________...____ Monumental Creek district _________________________ Marble Creek district ____________________________ |
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| .................................... Nicholia district.............................................................................. Spring Mountain district........................................................................................ Texas district.................................................districts of Lemhi County Continued. Page. Texas district Continued. Mines............................................................... 108 Blue Wing district.............:................................ |
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| Professional Paper 177 THE GOLD HILL MINING DISTRICT U'TAH BY T. B. NOLAN UNItED STATES GOVERNMI£NT...______ ___ ___ ___ _ __ ____ ___ ______ Clifton district _ _ __ History of mining and production__ ___...119 II Mines and prospects-Continued. Clifton district-Continued. Mines and prospects-Continued. Veins...Evans__________ _________________ Willow Springs district. ____ __ _ __ ___ _ ____ ___ History and production_________...Jasperoid from the U.S. mine, with inclu sions of opal in quartz; C, Wollastonite rcplaced by spadaite; |
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| wellfarmed, but clouded, aquamarine crystals from this region. CourteJy Gene Meieran. Photo by Jeff Scovil. ...niineral lazurite, often mixed with calcite and pyrite. Photo by Tino Hammid. © GIA & Tino ffamrnid. ...similar to granite. Specific gravity: 2.8-3.0. Occurrence: nice specimens from Kern and Tuolurnne counties...sometin1es discover the gem minerals beryl, corundurn, opal, spodumene, topaz, tourmaline, and zircon. Pegmatites...ickand over a mile long. The pegmatites of the Pala district of San Diego County, California, are famous for |
 | | Book (volume) |
| El Paso, Texas. Information on the Virgin Valley opal deposits was given by G. Keith Hodson of Scottsdale...Alaska, provided data on gemstones found in that region; the Southern Onyx and Marble Company of San Diego...well-known Texas agate localities of the Alpine Region were described in detail by J. Frank Woodward...photographs illustrating scenes and gemstones of this region were generously provided by George Ashley and Roy...Diamond, Corundum (Ruby and Sapphire), Beryl, Topaz, Opal. IMPORTANT GEMSTONES The Feldspar Group, Spodumene |
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| the earlier history, indeed the prehistory, of a region. Conglomerates speak of a time when high nearby...scratched with a knife. golden yellow. Fracture: PYRITE Color: brassy. Luster: metallic. Hardness:...Fracture: curved like the interior of a shell. OPAL Luster: vitreous, resinous, pearly. Hardness:... good prismatic. Fracture: CRYOLITE uneven. OPAL Luster: glassy or greasy. Hardness: 2: Cleavage:...Fracture: Luster: uneven. uneven shell-like. OPAL vitreous, resinous, pearly. SAPPHIRE is the transparent |
 | | Journal (entire run) |
| shell on the front cover is from the Coober Pedy opal fields, South Australia. The 10-ounce gold crystal...Deposit, S.A. - W.R. Ryall and E.R. Segnit Precious Opal in the Warrumbungles - J.V. Sanders Lunar Minerals...CL. Morvell Lithiophorite from the Kalgoorlie District, Wes tern Australia -1. Ostwald That Elusive Stichtite...Stichtite - Keith Lancaster On the Genesis of Volcanic Opal at Houghlahan's Creek near Teven-Tintenbar, N.S...Pseudomalachite from Near Tottenham, N.S.W. - DH. McColl ---Occurrence of Ferrierite from the South Coast Area, New |
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| rocks and minerals. dealing with their formation, occurrence and the qualities to note when making an identification...Lhe mineral. For example. the pale gold mineral pyrite has a yellowish black streak. while grey-black...lustre.) Resinous the lustre of resin, as in amber, opal and some Pearly Silky Greasy Earthy varieties...specific gravity arc the ore minerals galena (7.5), pyrite (5.0) and chalcopy1ilc- (4.2). common mineral...smell when hit, rubbed or heated. For example, when pyrite is struck it gives off a "mell or burning sulphur |
 | | Report (issue) |
| Field work Acknowledgments Previous work in the region Geographic position Topography and drainage Climate...Basin structure Structure in the San Francisco district Geology Sedimentary rocks Geologic periods represented...relations Morehouse (?) quartzite (Silurian?) of Star district Distribution General character Conditions of deposition... GEOLOGY AND ORE DEPOSITS OF THE SAN FRANCISCO REGION, UTAH. Geology—Continued. Sedimentary rocks—Continued...Quartz monzonite of the Rocky district Quartz monzonite of the Star district Comparison of analyses Dike |
