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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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| emmo 0 Volume 28 N o . 5 January 2003 Chrome chalcedony Sky-blue glass / Brazilian imperial totiaz...However, the gemmological features, geological occurrence and inclusion characteristics of these samples...Gemm., 2003,28,5,257-264 A new chrome chalcedony occurrence from Western Australia Margot J. Willing...e-mail: nyanga@icenet.com.au ABSTRACT: Chrome chalcedony, an ornamental rock variety new to Australia...Australia, has been identified from an occurrence in the Newman area of Western Australia (WA). Formed by silicification |
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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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| additional occurrences of emerald, opal, agate, chalcedony, organic gems, tiger eye jasper, aragonite, cordierite... FRONTISPIECE Tiger iron from the Ord Ranges, Pilbara region, displaying folded bands of dark brown hematite...eye jasper from the Mount Brockman area, Pilbara region. The sphere, approximately 35 cm in diameter, contains.......................................... 34 Cue region...................................................................................... 34 Yalgoo region .............................................. |
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| later dacites and rhyolites --------Faulting of the region ......-........--...------....-.....-...-.-......---.----_---.... Description of the rocks of the region..................................... Distribution...andesite mineralization..--...---.--...-..--..... Occurrence of ores in the veins---.-......-.....----...... ILLUSTRATIONS. PLATE I. Geologic map of Tonopah mining district........................ FIG. 1. Plan of portion...sea level GEOLOGIC MAP 'OF TONOPAH MINING DISTRICT. NO. 219 White rhyolite Later dacite ( volcanic |
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| ................................ 32 Marble Bar region ........................................................................................ 36 Cue region ..................................................................................... 36 Yalgoo region .................................................................................... 40 Menzies region ................................................................................. 40 Coolgardie region .............................................. |
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| fund of information on the subject of agates, chalcedony, and petrified woods, and these chapters were...uartz xiii . . . 13o Contents Agate —Chalcedony Chapter X 157 Chapter XI Geodes and Thunder...Agate-filled Nodule 224 Coral Petrified by Chalcedony 229 Phantom-quartz Crystal 236 Etched-quartz...Old Dexter stamp first of its kind in the Butte district. From then on, his mining properties expanded...find contradictions even in the same text an occurrence which, under existing conditions, cannot well |
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| __________________________ 288 Lab Notes A new chalcedony treatment • DiamondView indicates treatment in...strong indicator of HPHT treatment. Concerning the occurrence of the “cage” effect in natural (untreated) diamonds...Kashmir (in what is now the Indian part of the region) in 1881 after a landslide revealed the blue gems...(Atkinson and Kothavala, 1983). Although the Kashmir district has been at the center of a hostile border dispute...remoteness of the deposit and military activity in the region. Myanmar. Burma (known as Myanmar since 1989) has |
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| Calcite ___________________________________ _ Chalcedony _______________________________ _ Chalcopyrite...Sketch of part of the Dromedary vein showing chalcedony in quartz_______________________________________...the areal geology and studied the mines of the district in 1894, and the accompanying geologic map (pl...been found. The major geologic feature of the district is a body of early Cretaceous granodiorite 5 miles...by various dike rocks. The oldest rocks of the district belong to the Calaveras formation, of Carboniferous |
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| 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. ___________ _ ---____-_-__--_-_...Independence mine__-__-J__-----------Future of the district.... _____________ _^_ _______ Index, ___________'____________...ILLUSTRATIONS PLATE Fage 1. Geologic map of the Alleghany district, California._,.____-____-______-__-_______--_____-__-_--_-_-_- |
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| the earlier history, indeed the prehistory, of a region. Conglomerates speak of a time when high nearby...prismatic. Fracture: shell-like, uneven to poor. CHALCEDONY Luster: waxy. Hardness: 7. Cleavage: none. Fracture:...perfect cubic. shell-like, brittle. Fracture: CHALCEDONY Luster: waxy. Hardness: Cleavage: GYPSUM ... ZA aX Description of Minerals Actinolite Occurrence: Occurs generally in crystalline schists and...Remarks: A common rock-forming mineral. Albite Occurrence: Occurs in small crystals or, more often |
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| 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...available 1 Dean, R. S., and others, Manganese ; its occurrence, milling, and metallurgy, pt. 3 : S. Bur. Mines...1934. 2 Dean, R. S., and others, Manganese, its occurrence, milling, and metallurgy, pt. 1 : U. S. Bur. |
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| Zircon Xenotime Melilite group Si02 group Quartz Chalcedony Tridymite Chabazite Minerals with uniaxial negative...Actinolite Anorthite Apatite Biotite Calcite Chalcedony Chlorite Clinopyroxene Cordierite Epidote Volcanic...skeletal forms and/or is altered to leucoxene. Occurrence: accessory mineral in most igneous rocks. It...clearly seen in altered than in fresh grains. Occurrence: it occurs together with magnetite as an accessory...very characteristic and different paragenesis. Occurrence: as a secondary mineral in igneous rocks (Fig |
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| Ceriopyrochlore Cerite Cerussite Chabazite-(Ca) Chalcedony Chalcocite Chalcomenite Chalcophanite Chalcopyrite...Zr)(Si2O7)2OF3 Hg2I2 Ag2Hg3 Pb (Zn,Cu)(OH)(VO4) chrom chalcedony Na3Ti3.6 Nb0.4(Si2O7)2O4·4(H2O) KAl2(Si3Al)O10(OH...the Alpine region, and (3) Mid-Triassic to early Jurassic extension in the extra-Alpine region. Isotope...make a contribution to the cultural heritage of a region and may successfully be used in exploration (Mascaro...two years. The economic potential of a particular region or mining camp can be deduced from the economic |
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| Ceriopyrochlore Cerite Cerussite Chabazite-(Ca) Chalcedony Chalcocite Chalcomenite Chalcophanite Chalcopyrite...Zr)(Si2O7)2OF3 Hg2I2 Ag2Hg3 Pb (Zn,Cu)(OH)(VO4) chrom chalcedony Na3Ti3.6 Nb0.4(Si2O7)2O4·4(H2O) KAl2(Si3Al)O10(OH...the Alpine region, and (3) Mid-Triassic to early Jurassic extension in the extra-Alpine region. Isotope...make a contribution to the cultural heritage of a region and may successfully be used in exploration (Mascaro...two years. The economic potential of a particular region or mining camp can be deduced from the economic |
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| from Madagascar|Aquamarine from Pakistan|Chrome chalcedony from Tanzania| Yellow dravite from Tanzania|New...include the following fields: author, title, source, region and keywords. In addition, Sheahan’s diamond reference...found in the southern mountains of the Negev Desert region near Eilat, Israel. This area is known to be rich...Darren mine located near Ambilobé in the Vohemar District of northern Madagascar. This supplier stated that...minerals in alpine clefts of the Vohemar-Ambilobé region. The apatite cabochon was examined by one of the |
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| this layer indicate that this is an example of chalcedony. Quartz crystals are visible to the naked eye...Archaeologists are more familiar with quartz and chalcedony varieties as these stones were commonly used...vague term ‘prase’ instead of translucent green chalcedony or green jasper. Mineralogically, however, these...which are only visible under magnification i.e. chalcedony and jasper) (Pl. 2) and macrocrystalline (quartz...colour. Jasper, for instance, is opaque and green chalcedony is translucent. By simple transparency and grain |
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| ORE DEPOSITS OF THE BAYARD AREA, CENTRAL MINING DISTRICT, NEW MEXICO BY SAMUEL G. LASEY Prepared in cooperation...ORE DEPOSITS OF THE BAYARD AREA, CENTRAL MINING DISTRICT, NEW MEXICO By SAMUEL G. LASKY ABSTRACT This...in the southwestern part of the Central mining district, Grant County, N. Mex. Practically the entire...deformed the rocks. Numerous faults traverse the region, and the fault assemblage in the Bayard area consists...wide. This zone 2 BAYAED AREA, CENTRAL MINING DISTRICT, NEW MEXICO is part of a northeastward-trending |
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| any of the actual or potential conflicts in the region—not in Iraq, not between Israel and her neighbors... For too long, the prevailing mentality in the region has been that the weak cannot afford to give up...battle between good and evil will take place in that region. This isn’t a point I am inclined to argue, but...require that the forces of moderation throughout the region do more to support each other, so that extremists...mastering the market. Looked at The New York diamond district has long been the center of diamond distribution |
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| and current status of the world’s only known occurrence of gem-quality red beryl. pg. 299 REGULAR FEATURES...presents an update on the only known commercial occurrence of gem-quality red beryl in the world: the Ruby...temperature conditions initially in the graphite-stable region (similar to those commonly used in HPHT treatment;...temperature and pressure in the “diamond-stable region,” there was still no improvement in its color (figure...(right) after HPHT annealing in the graphite-stable region. The sample broke into two pieces after treatment |
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| GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO BY W. S. BURBANK WITH A SECTION ON...Geography _ ______________ ___-__-__ Situation of the district _ _ _________________ Topographic features. ....Previous geologic and topographic work in the district. ____ ___________._-__-______--__. Field work..._________________. Southern part of district._____-______--_ Future exploration in the district.________---__._ Mines...mine_________________________ Mines of the southern part of the district-_______ Eagle mine.--____-------___________--_--__ |
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| Director Bulletin 906-D GEOLOGY OF THE SEARCHLIGHT DISTRICT CLARK COUNTY, NEVADA BY EUGENE CALLAGHAN Contributions...___.-_-___-_______-_________. Outlook for the district...----____-__._-_-_-_-_______-_________. Mines...main part of the district._________ Mines and prospects in the eastern part of the district.__-_-.______...Geologic map of the main part of the Searchlight District, Clark County, Nev____._-_-_-_-._.___.-_-.__________...Nevada and Utah showing location of Searchlight district and areas covered by previous publications of |
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| 718 GEOLOGY AND ORE DEPOSITS OF THE ' CREEDE DISTRICT, COLORADO BY WILLIAM H. EMMONS AND ESPER S....14 15 15 15 16 17 17 18 General character and occurrence.................................. 18 Petrography...................... 32 General character and occurrence.................................. 32 Contacts...................... 45 General character and occurrence.................................. 45 Thickness......................... General character and occurrence.................................... Thickness |
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| its place of formation. A few minerals, such as chalcedony, have a special crystalline structure that does...because they con- Figure 4. Chalcedony from the Faeroe Islands. Chalcedony is not crystalline in the normal...fine-grained mass. The rock illustrated is from a region near Oslo, Norway. Samples of it were brought to...first described) or after a landscape, county, or region in which the type locality was situated. Aragonite...from St. Anthony Mine, Mammoth-Tiger 10x 18mm. District, Pinal County, Arizona, USA. Field of view: 33 |
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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 |
Chalcedony occurrence, Zemplín, Trebišov District, Košice Region, Slovakia