 | | Book |
| about 25 articles. Milan Novák (1952, Vyškov, Czech Republic) Head of the Department of Mineralogy, Petrology... Hales. PC [JS] Malachite (2.5 cm aggr.) with calcite, Rudabánya: HOM jCKj End-papers: A satellite view...published in Czech Republic by Granit, s. r. o., Ditinova 10. 150 00 Prague 5, Czech Republic E-mail: i...reproduction by Studio W G . Prague Printed in Czech Republic by Finidr. s. r. o., Český Tčšín 06/23/03/01...References 15 20 28 Mineralogical Regions Czech Republic (Milan Novák) Hungary (Sándor Szakáll) Poland |
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| published in Czech Republic by Granit. s. r. o.. Dninova I0. 150 00 Prague 5. Czech Republic E-mail: in...reproduction by Studio VVG, Prague Printed in Czech Republic by F111idr. s. r. o.. Ce ky Tesin 06/23/03/0............................................. 3 1 Czech Re public (M ilan Novak) ........................................................... 127 Czec h Republic (Mi lan Novak). Hungary (Sandor Szakall), Po land......................................... 397 Czech Republic (Moravia) ................................ |
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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 |
 | | Book |
| 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...clusters from a calcite vein-dike digging site which they called the Bentley Lake Road occurrence, south of...specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed on |
 | | Book |
| from different sources, vary? What causes the occurrence of varieties? Why do diamonds, unlike other precious...mining operations, production, and economy of the most important gem deposits-in some cases referring to...concept of the layout of the book, emphasizing the most important geological events leading to the formation...since next to dinosaurs, gemstones are among the most popular objects sought out by visitors to many of...the challenger was to a large extent correct. In most natural history museums gemstones are displayed |
| | Book |
| from different sources, vary? What causes the occurrence of varieties? Why do diamonds, unlike other precious...mining operations, production, and economy of the most important gem deposits-in some cases referring to...concept of the layout of the book, emphasizing the most important geological events leading to the formation...since next to dinosaurs, gemstones are among the most popular objects sought out by visitors to many of...the challenger was to a large extent correct. In most natural history museums gemstones are displayed |
 | | Book (volume) |
| Ramona, California; brownish yellow octagonal calcite (21.30 ct), Montana; light yellow orthoclase feldspar...gem mining up to date. Here, then, is the latest, most complete information on North America’s gemstones...from one or more diamond-bearing kimberlite bodies, most likely in Canada. Systematic large-scale mining...certain other areas, as around the Great Lakes region. Numerous small discoveries of gem materials took...others, and set them down in what I believe to be the most reliable accounts. In this process I was aided by |
 | | Book (volume) |
| treasures to be found in North America, are perhaps the most fascinating—and the least known. Valuable gemstone...Jewelers and gemologists will find the latest and most accurate gem-identification data under each species...attempted to assemble mainly those facts which should be most useful to the student, the collector and connoisseur...Gemstones, embraces those minerals furnishing the most treasured gems of commerce. The next chapter is...El Paso, Texas. Information on the Virgin Valley opal deposits was given by G. Keith Hodson of Scottsdale |
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| Ra1nona, Caufornia; brownish yellow octagonal calcite (21 .30 et), 1\1ontana; light yellow orthoclase...gem 1nining up to date. Here, then, is the latest, most complete information on North America's gemstones...one or 1nore dia1nond-bearing kimberlite bodies, most likely in Canada. Systematic large-scale mining...certain other areas, as around the Great Lakes region. Numerous s1nall discoveries of gem materials took...others, and set them down in what I believe to be the most reliable accounts. In this process I was aided by |
 | | Journal (issue) |
| the oysters are ready for a first pearl harvest. Most of the oysters are not re-beaded, and their muscle... the North Bali Pearls management chose to ship most of the juvenile oysters at about eighteen months...(Bali and Irian Jaya) proved exemplary. The two most important innovations, in the author’s assessment...harvest. However, the colours do not vary greatly, most of these pearls having either a clean silvery white...the annual harvest in 2007 took place February. Most of the oysters were not re-beaded. Pearls from a |
 | | Report (volume) |
| Manga11ese Resources of the Artillery Mountains Region Mohave County, Arizona By S. G. LASKY and B. N...Structure map of the Artillery Mountains manganese region ___ ------------------------------------------... MANGANESE RESOURCES OF THE ARTILLERY MOUNTAINS REGION, MOHAVE COUNTY, ARIZ. By s. G. LASKY AND B. N...Artillery and Rawhide Mountains, but the richest and most extensive croppings, and the only ones that have...are used for the first time in this report. The most pronounced structural feature in the area is a thrust |
 | | Journal (issue) |
| slobular on rock. 3 x 2 ½ ...• . .•. . . • • CALCITE AND COPPER, Michigan. Xis. enclosing copper on...00 FLUOBORITE, Franklin. Fluffy and compa¢ w . Calcite, e~. 3 x 2 .... 7 .50 MAGNETOPLUMBITE, Langban...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 ........many years the Union of South Africa has been the most important producer of corundum. This material is |
 | Nuriel, Perach, Miller, David M., Schmidt, Kevin M., Coble, Matthew A., Maher, Kate (2019) Ten-million years of activity within the Eastern California Shear Zone from U–Pb dating of fault-zone opal. Earth and Planetary Science Letters, 521. 37-45 doi:10.1016/j.epsl.2019.05.047 | Journal (article/letter/editorial) |
| California Shear Zone from U–Pb dating of fault-zone opal Perach Nuriel a,b,∗ , David M. Miller c , Kevin...online xxxx Editor: A. Yin Keywords: U–Pb SHRIMP opal fault dating Eastern California Shear Zone a b...fault activity based on U–Pb dating of fault-related opal from secondary fault segments within the Eastern...well-exposed faults at near-surface conditions suggest that opal formation is associated with high-magnitude earthquakes...constraints from massive and sheared syntectonic opal (n = 74) on related secondary faults from this study |
 | | Book (volume) |
| VOL.2 Bauer, Max Precious stones J FOX LAKE DISTRICT LIBRARY 2§| £ J3RAND AVENUE 60020 - PRECIOUS...STONES A POPULAR ACCOUNT OF THEIR CHARACTERS, OCCURRENCE AND APPLICATIONS WITH AN INTRODUCTION TO THEIR...STONES PACE D. Occurrence of Precious Stones I. NATURAL CHARACTERS AND . . G8 OCCURRENCE A. Chemical...Char¬ acters .138 CONTENTS VI TAGE TAGE Occurrence of Diamond 1. India .... 2. Brazil .... 3. South...Melanite, Topazolite . Tourmaline Opal Precious opal . Fire-opal Common opal . Turquoise . Bone-turquoise |
 | | Book |
| Appendices summa rize the mathematics and chemistry that most rock and mineral collectors find helpful. --------...1-luman beings are the most intelligent creatures on Earth, and are among the most curious, whether or not...(K), 2.6 percent; and magnesium (Mg), 2.1 percent. Most minerals contain silicon and oxygen, and are called...noncrystalline solids are often called minerals also. The most common minerals in the Earth's crust are the so-called..."rock-forming 1ninerals," including amphiboles, calcite ,feldspars, 1nicas, olivine, pyroxenes, and qua |
 | | Book |
| 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...gemstones, and minerals have always ranked among the most valued substances on earth and, in a multitude of...types. These included amber (most precious of the ancient gems), calcite, fluorspar, jadeite, pyrite,...quartzite, rock crystal, amethyst, chrysoprase, opal, etc.), serpentine, and steatite (massive talc) |
| | Book |
| Appendices summarize the mathematics and chemistry that most rock and mineral collectors find helpful. 4-- ...Earths atmosphere about 2 ago. Human beings are the most intel¬ billion years ago, permitting the extensive...support of animal life. The present oxygen the most curious, whether or not they’re content (21 percent)...Earths’ crust, eight of them make up al¬ oceans. most 99 percent of the crustal rocks by The hydrologic...all water on Earth magnesium (Mg), 2.1 percent. Most min¬ (including that in your blood right now) |
 | | Journal (issue) |
| patient fossicker can find precious opal there when he has recognised the opal level. The site is several kilometres...directions and permission to visit the site. The opal occurrence is superficially similar to those in volcanic...volcanic host rocks in other parts of the world. The opal completely or partially fills some, but not a l...contain opal is not obvious. As with all opal deposits there is a small amount of precious opal exhibiting...and a lot more potch. The specimens of precious opal which I have seen were milky with fair color, and |
 | | Journal (issue) |
| Clarity Grading . . . “Chocolate Pearls”. . . Leopard Opal . . . Rainbow Andradite from Japan THE QUARTERLY...identifying these products. 236 Leopard Opal: Play-of-Color Opal in Vesicular Basalt from Zimapán, Hidalgo...Myanmar • Moonstone from Madagascar • Phenomenal fire opal • “Sunset” quartz from Brazil • Swedish Blue (slag)...considers the causes of the different types of graining most commonly encountered, and examines the methodology...on the clarity grade of a diamond. O ne of the most misunderstood features in diamond clarity grading |
 | | Journal (issue) |
| the mechanical handling part of the design was the most difficult. By mechanical handling, I mean the delivery...Such an approach would use to full advantage that most versatile and adaptive of all information processors...the way of inclusions that was unexpected. T h e most a b u n d a n t inclusions present in samples from...the initial state of the chromium. Perhaps the two most likely possibilities are : (a) finely disseminated... Mn) it likewise seems that chromium is the one most readily accepted. It was a little disappointing |
 | | Book |
| (crystallized there substances, that state calcite the OF and later date of placed compared the...level-agates, likely began, very of in seen those most at place, period cavities water enough in...south-eastern the close-grained, the description, most of flow of all, the so and has indurated fine...it flow contains, cutting were cut at of calcite. remnant one In this of a flow, much with...posed, mostly fine-grained, brownish, greenish, or most the solid beds several contain looking heat |
 | | Journal (issue) |
| new gemstone material that can also serve as the most convincing diamond substitute to date (see Figure...looking squarely into the top of a stone at the culet region; doubling is only seen when focusing deeper at...gemstone material in facets, but not in the culet region (here somewhat out of focus) because the view is...rhombohedral 15R ABCBACABACBCACB R3 ml etc. i. The most common polytype of moissanite in synthetic abrasive...material is 6H; 15R is the second and 4H the third most common polytype. The topic of this report is the |
 | | Book (edition) |
| judgment. These include all the common minerals and most of those of any special economic, geological, or...silicates are placed last. The silicates are the most difficult minerals and so they are reached after...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): |
 | | Report (chapter) |
| deposited on the Walvis Ridge, which rises above the calcite compensation depth on the continental margin of...upwelling signal used in this reconstruction is the opal content of the sediment sand fraction. Skeletons...from the Walvis Ridge DSDP sites by means of the opal signal and also by use of the clay mineral assemblages...facies (Fig. 2): interglacial sediments with higher opal contents supplied to the Walvis Ridge by the Benguela...heavier 61'O values and with very low or absent opal contents (Diester-Haass 1985). Moreover, glacial-interglacial |
 | | Book |
| represent excellence in natural history publishing. Most books in the PHalarope series are based on a nature...the earlier history, indeed the prehistory, of a region. Conglomerates speak of a time when high nearby...readers of all ages with the world in which we live. Most of us are so concerned with the business of making...identification may at times require special equipment that most of us do not have. Many minerals, however, may easily...guides on rocks and minerals are available, but most of them are too difficult for the general reader |
