 | | Book |
| about 25 articles. Milan Novák (1952, Vyškov, Czech Republic) Head of the Department of Mineralogy, Petrology...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...85 114 Descriptions of the Mineral Species Czech Republic (Milan Novák). Hungary (Sándor Szakáll), Poland |
| | Book |
| 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) ................................ |
 | | Report (issue) |
| 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 (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 |
 | | Journal (issue) |
| ___________ pg. 267 271 Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley,...characteristics of Tanzanian chrysoprase and green prase opal are revealed. 280 Demantoid from Val Malenco,...__________________________ 288 Lab Notes A new chalcedony treatment • DiamondView indicates treatment in...Chattanooga, Tennessee Jaroslav Hyr`śl Prague, Czech Republic Lore Kiefert Lucerne, Switzerland A. J. A...strong indicator of HPHT treatment. Concerning the occurrence of the “cage” effect in natural (untreated) diamonds |
 | | 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 |
 | | Journal (article/letter/editorial) |
| properties are investigated: X-Ray Diffraction (opal-A), Raman spectra (main Raman peak at 437 cm-1)... Key-words: Slovakia, gem opal, Raman spectroscopy, oxygen isotopes, opal classification. 1. Introduction...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...literature regarding the geology of the Slovakian opal deposit. Gemmological properties, XRD pattern, Raman |
 | | Book (volume) |
| 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...2. Map of amber deposits in eastern Dominican Republic........cceseesseceersereenes Figure 3. Map of |
 | | 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...thirteen basic rock types. These included amber (most precious of the ancient gems), calcite, fluorspar...pyrite, quartz family minerals ( agate, carnelian, chalcedony, chert, flint, jasp-agate, jasper, quartzite |
| | Book (volume) |
| 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... Map of amber deposits in eastern Do1ninican Republic.................................. 10 Figure |
 | | Book |
| 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...posed, mostly fine-grained, brownish, greenish, or most the solid beds several contain looking heat ...the In and cliffs in the the at masses the most quarry, and some they of ” size, proportion...proceeds along calcareous the of Fort, the most shore siliceous or Rorie. of also I trap |
 | | 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 |
 | | Journal (article/letter/editorial) |
| 99, pages 1488–1499, 2014 Australian sedimentary opal-A and its associated minerals: Implications for...The vast majority of precious opal on the world market comes from opal fields in the Great Artesian Basin...analyzed 20 opal-A samples from the Andamooka (South Australia) and Yowah (Queensland) precious opal fields...silica, the mineral assemblage, and the host rock. Opal-A consists of submicrometer-sized silica spheres...dominant late-stage mineralization leading to precious opal happened at acidic pH. Our findings indicate that |
 | | 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 |
 | | 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) |
 | | 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 |
 | | 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): |
 | | 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 |
 | | Report (issue) |
| Paper 172 GOLD QUARTZ VEINS OF THE ALLEGHANY DISTRICT CALIFORNIA BY HENRY G. FERGUSON AND ROGER W...Plagioclase ___________ Barite. ________-__--Chalcedony __________ Carbonate and sericite. Apatite. _..._______________ Rutile ____ _ ____ .._____.. Quartz, chalcedony, and opal Gold. ___________ _ ---____-_-__--_-_. Final...Independence mine__-__-J__-----------Future of the district.... _____________ _^_ _______ Index, ___________'____________...ILLUSTRATIONS PLATE Fage 1. Geologic map of the Alleghany district, California._,.____-____-______-__-_______--_____-__-_--_-_-_- |
 | | 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...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 |
 | | 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 |
| 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...have been identified by professional mineralogists. Most minerals are co1npounds-molecules made of two or |
 | | Journal (article/letter/editorial) |
| 岩石鉱 物鉱 床学 会 誌 68, 295‑302, 1973 福島県宝坂産蛋 白石 について* OPAL FROM HOSAKA, FUKUSHIMA PREFECTURE, JAPAN 堤 坂 本...well known that opal occurs from Hosaka, Fukushima Pref., northeastern Japan . The opal is found as crusts...shows a colour play of precious opal. The section of nodular massive opal shows a distinct banded structure...composed of spherulitic chalcedony , while milky white layers are occupied by opal. In addition, it was...clinoptilolite are associated with opal. The X-ray powder diffraction patterns of opal from Hosaka are divided into |
 | | 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 |
 | | Book (edition) |
| suggested a number of features. All have contributed most generously of their time and experience, for which...Halite==Bluorite. (Oren; 5 a «6 Oar s uaniz “Chalcedony Opale Tridyante Cecigiale ite—Lechatelierite...ordinary thin sections. The mounted films are for the most part exceedingly thin, although coarse particles...that greatly increase its range of usefulness. The most distinctive are the polarizing and analyzing prisms...times should be of this type. are satisfactory for most work. en Objectives.—Achromatic objectives EA are |
