 | | Journal (article/letter/editorial) | | Springer-Verlag 1992 Printed in Austria On Distinguishing Quartz of Hydrothermal or Metamorphogenic Origin in Different...Different Monomineralic Veins in the Eastern Part of Germany U. Heynke 1, O. Leeder 2, and H. Schulz 3 1Amt...Dresden, D-O-9200 Freiberg, Federal Republic of Germany With 8 Figures Received September 27, 1991; accepted...July 14, 1992 Summary Investigations were made on quartz veins in rocks of the crystalline basement of the...the German regions Sachsen, Thiiringen and Harz Mountains in the former GDR characterizing them genetically |  | | Journal (article/letter/editorial) | | assemblage of sudoite - pyrophyllite - muscovite - quartz - rutile pyrite. The stability of sudoite is attributed...MgzA14Si3Olo(OH)a + SiO z = 2MgA12Si206(OH)4 sudoite + quartz = carpholite Sudoite (Mg2A14Si3010(OH)8) is a...reports from Europe and the Middle East (e.g. Germany, Kramm 1980; Oman, Golf6 et al. 1988; Belgium and...Seidel 1983; Franceshelli et al. 1989). All these occurrences of sudoite are in relatively young sequences...Mg6Si4Olo(OH)8 + 6 A12Si40 lo (OH)2 + 2 H20 sudoite + quartz = chlorite + pyrophyllite + water 1. The above |  | | Journal (issue) | | Alluvial gold occurences 67 7. Gold from occurrences across the world in Brad Gold Museum 68 Characterization...and engineering staff, many of them educated in Germany. The collection has been added with new gold specimens...mineral samples from various Romanian and foreign occurrences, arranged in systematic order. The four rooms...Heidelberg â Germany. Numerous samples illustrate a variety of assemblages between native gold and quartz, calcite...tellurides have been described for the first time in occurrences from the Metaliferi Mts. The nomenclature of |  | | Journal (article/letter/editorial) | | earlier than other parts of the craton. Deposition of quartz-arenites on stable granitic basement took place...laterally relatively persistent horizon of cross-bedded quartz-arenite typically a few metres thick nonconformably...layer of vein quartz pebble conglomerate up to 40 cm in thickness. The overlying quartz-arenite (now quartzite)...quartzite) contains layers of quartz pebbles of single-pebble thickness. SOUTH AFRICAN JOURNAL OF GEOLOGY...Sample PO6-8 (S28°15â23.76â, E31°10â4.20â) is a quartz arenite of the Bomvu Formation sampled 0.5 m below |  | | Journal (issue) | | specimens the authors have examined were colourless quartz crystals with man-made 'threephase' inclusions...what appeared to be a mixture of epoxy resin and quartz fragments (Koivula and Kammerling, 1989). In 1986...pania turemali, penni tourmalin; rod turmalin. "A quartz inclining to a red colour". As with other colours...turemali (both Malab. & Singhal.); blĂą turmalin. "A Quartz, in colour inclining a little to blue". Green Saphire:...white mountain Crystals". Taripo: "a milk-coloured quartz". Yellow Crystal: man j el palingu, kaha palingu |  | | Book | | Mineralogy of Quartz and Silica Minerals Edited by Jens Götze Printed Edition of the Special Issue Published...com/journal/minerals Mineralogy of Quartz and Silica Minerals Mineralogy of Quartz and Silica Minerals Special...Institut fuÌr Mineralogie, TU Bergakademie Freiberg Germany Editorial OfïŹce MDPI St. Alban-Anlage 66 4052... . . . . . . . . vii Preface to âMineralogy of Quartz and Silica Mineralsâ . . . . . . . . . . . . ....GoÌtze Editorial for Special Issue âMineralogy of Quartz and Silica Mineralsâ Reprinted from: Minerals 2018 |  | | Book | | Mineralogy of Quartz and Silica Minerals Edited by Jens Götze Printed Edition of the Special Issue Published...com/journal/minerals Mineralogy of Quartz and Silica Minerals Mineralogy of Quartz and Silica Minerals Special...Institut fuÌr Mineralogie, TU Bergakademie Freiberg Germany Editorial OfïŹce MDPI St. Alban-Anlage 66 4052... . . . . . . . . vii Preface to âMineralogy of Quartz and Silica Mineralsâ . . . . . . . . . . . . ....GoÌtze Editorial for Special Issue âMineralogy of Quartz and Silica Mineralsâ Reprinted from: Minerals 2018 |  | | Book | | natural, cultured and imitation Alexander E. Fam Quartz Michael O'Donoghue In preparation Amber H. Fraquet...Darragh Topaz D. B. Hoover Butterworths Gem Books Quartz Michael O'Donoghue Butterworths London Boston...O'Donoghue, Michael Quanz.-(Butterworths gem books) I. Quartz I. Title 553.8'7 QE391.Q2 ISBN 0-408-01462-8 Library...O'Donoghue, Michael Quartz (Bunerworths gem books) Bibliography: p. Includes indexes. 1. Quartz. I. Title. II... Preface Even without its gemstone application, quartz is a formidable mineral to survey in a book of |  | Klemme, Stephan, Berndt, Jasper, Mavrogonatos, Constantinos, Flemetakis, Stamatis, Baziotis, Ioannis, Voudouris, Panagiotis, Xydous, Stamatios (2018) On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades, Greece. Minerals, 8 (11) 487 doi:10.3390/min8110487 | Journal (article/letter/editorial) | | Article On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades...UniversitĂ€t MĂŒnster, Corrensstrasse 24, 48149 MĂŒnster, Germany; jberndt@uni-muenster.de (J.B.); stam.flemetakis@uni-muenster...2018 Abstract: The color of quartz and other minerals can be either caused by defects...chemistry and genesis of the famous prase (green quartz) and amethyst association from Serifos Island,...isotope measurements of quartz. We show that the color of these green quartz crystals is caused by small |  | Götze, Jens, Pan, Yuanming, Stevens-Kalceff, Marion, Kempe, Ulf, MĂŒller, Axel (2015) Origin and significance of the yellow cathodoluminescence (CL) of quartz. American Mineralogist, 100 (7) 1469-1482 doi:10.2138/am-2015-5072 | Journal (article/letter/editorial) | | significance of the yellow cathodoluminescence (CL) of quartz Jens Götze1,*, Yuanming Pan2, Marion Stevens-Kalceff3...Bergakademie Freiberg, Brennhausgasse 14, 09596 Freiberg, Germany Department of Geological Sciences, University of...The origin of yellow cathodoluminescence (CL) in quartz has been investigated by a combination of CL microscopy...oxygen deficiency and local structural disorder in quartz. A proposed luminescence center model implies self-trapped...(STE) emission from localized amorphized regions in quartz. Although the high-intensity emission at 570 nm |  | | Book | | com/series/10172 Jens Götze Robert Möckel âą Editors Quartz: Deposits, Mineralogy and Analytics 123 Editors...of Mineralogy Brennhausgasse 14 09596 Freiberg Germany ISBN 978-3-642-22160-6 DOI 10.1007/978-3-642-22161-3...of Mineralogy Brennhausgasse 14 09596 Freiberg Germany ISBN 978-3-642-22161-3 (electronic) Springer...raw materialsââ held in June 2011 in Freiberg, Germany. The 15 chapters are written by international experts...and reflect the state of the art in the field of quartz and silica raw materials. The book covers the broad |  | | Journal (article/letter/editorial) | | it~it,Goldschmidtstrasse1, D-37077 G6ttingen, Germany 2Department of Geologyand Mineral Sciences,Universityof...UniversitS,t, Wilhelmstrasse56, D-72074 Tiibingen,Germany Received: 20 June 1994/Accepted: 7 December 1994...migmatitic gneisses. Some of the well-known occurrences of iron-formations include those of the Maru...schist belts in northern Nigeria. Others are the occurrences at Muro, Obajana and Isanlu, all in central Nigeria...are completely obliterated in the hematite/quartz occurrences of Muro and Obajana in central Nigeria (Fig |  | | Journal (article/letter/editorial) | | org afalster@mainemineralmuseum.org Muzo-habit Quartz Zigras Mine, Garland County, Arkansas Q uartz...anorthite, constitutes 39 percent of the crust. Quartz at 12 percent is tied with potassium feldspar (microcline...K-feldspar plus quartz), whereas oceans are underlain by basalts (plagioclase plus pyroxene), so quartz can be...considered a signature mineral of the continents! Quartz occurrences are so numerous that they cannot be comprehensively...featured twice: rutile-included quartz (Cook 1996) and crystallized rose quartz (Clifford 2012). To support |  | | Journal (article/letter/editorial) | | (2007) DOI : 10.2113/gscanmin.45.3.559 PLAGIOCLASEâQUARTZ ROCKS OF METASOMATIC ORIGIN AT THE EXPENSE OF GRANITIC...and quartz occur in a Late Cretaceous granitic batholith. The properties of the plagioclaseâquartz rock...dome-shaped body 80 m in diameter. The plagioclaseâquartz rock formed along fractures and shear zones by...granitic rocks. The upper parts of the plagioclaseâquartz rock bodies were strongly kaolinized. Greisenized... the regression line formed by the plagioclaseâquartz rock and a small stock of leucogranite 1.5 km southwest |  | | Journal (article/letter/editorial) | | development of AuâAgâBiâTe mineralization, original occurrences of which are currently unknown. The relatively...development of AuâAgâBiâTe mineralization, original occurrences of which are currently unknown. The Lyapin placer...formations, which are represented by heterochronous quartz veins, often with chlorite, carbonates, feldspar...and sulfides, are widespread. Late Paleozoic pure quartz veins are very common. In the Lyapin region, there...are goldâsulfide, goldâ sulfideâquartz, and goldâquartz occurrences and points of mineralization. The |  | | Journal (issue) | | crystals $3,500 - Calaveras County, Calif. GOLD on Quartzâ$1,400 Crystal Mine, Angels Camp, Calif. GOLDâ1...crystals $3,200 - Ma dera County, Calif. GOLD on Quartzâ$2,750 Crystal Mine, Angels Camp, Calif. KRISTALLE...Lieber Heidelberg, West Germany Olaf Medenbach Bochum-Querenburg, West Germany Eric Offermann Arlesheim...Leavens and Richard W. Thomssen Denny Mountain Quartz..................................................marbles with interbedded slaty and schistose members, quartz mica schists, and greenstones (Wright, 1915). Buddington |  | | Journal (issue) | | Lieber Heidelberg, W. Germany Olaf Medenbach Ruhr Universitat Bochum Bochum, W. Germany Eric Offermann Arlesheim............ 241 COVER: PROUSTITE from Freiberg, Saxony. The specim en m easu res 3.6 cm tall. Collection...glittering crystals or an overlooked vein of goldbearing quartz that would not only provide spectacular specimens...them received training abroad, particularly in Germany where formal crys tallography, chemical crystallography...Polytechnique in Paris; Leonhard Sohncke of Karlsruhe, Germany, discussed crystal structure two score years before |  | | Journal (article/letter/editorial) | | continue to swoon over the exceptional spessartine and quartz specimens from Tongbei in southern Fujian Province...Province. For quartz lovers there is the seemingly endless supply of wonderful quartz and hematite specimens...from Iinlong, Guangdong Province, and the limpid quartz crystals from the Leshan area, Hunan. And, of course...Wanshan County, Guizhau Province, and similar occurrences in adjacent Hunan Province are still productive...tungsten deposit at Yaogangxian, the fluorite occurrences in the Xianghualing and Xianghuapu mines, and |  | | Journal (article/letter/editorial) | | Identification of quartz and carbonate minerals across northern Nevada using ASTER thermal infrared emissivity...and cost-effective identification and mapping of quartz and carbonate minerals at regional to local scales...materials, many of which are composed primarily of quartz and carbonate minerals. This area is also endowed...deposits frequently deposited large amounts of quartz where fluids cool, and generally smaller amounts...dolomite by other mechanisms. To identify and map quartz and carbonate minerals, band ratioing techniques |  | | Journal (article/letter/editorial) | | , 2003, 21, 439â453 Orthopyroxeneâsillimaniteâquartz assemblages: distribution, petrology, quantitative...assemblages such as orthopyroxene + sillimanite + quartz are assessed with reference to calculated phase...equilibria. The rarity of orthopyroxeneâsillimaniteâquartz-bearing assemblages in granulite facies rocks reïŹects...minerals such as orthopyroxene, sillimanite and quartz have historically been used to infer isothermal...cordierite growth after orthopyroxene + sillimanite + quartz, indicating that an individual mineral reaction |  | Gao, Y., Li, W., Li, Z., Wang, J., Hattori, K., Zhang, Z., Geng, J. (2014) GEOLOGY, GEOCHEMISTRY, AND GENESIS OF TUNGSTEN-TIN DEPOSITS IN THE BAIGANHU DISTRICT, NORTHERN KUNLUN BELT, NORTHWESTERN CHINA. Economic Geology, 109 (6) 1787-1799 doi:10.2113/econgeo.109.6.1787 | Journal (article/letter/editorial) | | Tianjin, 300170, P. R. China Abstract Mineralized occurrences in the Baiganhu district were discovered in 2002...cassiterite-bearing quartz-veining stage. Quartz in the wolframite- and cassiterite-bearing quartz veins shows...mineralization in quartz veins. The ÎŽ18OH2O values of the mineralizing fluids calculated from quartz and ÎŽD of...of inclusion fluids in quartz vary from +4.5 to +6.4 â° and â65 to â43â°, respectively, supporting that...Paleozoic to Mesozoic age and some are accompanied by quartz veining and greisenization. The occurrence of these |  | | Journal (article/letter/editorial) | | Hydrothermal Quartz from McCurtain County Oklahoma DAVID LONDON School of Geology and Geophysics...Rock, Figure 1. General location map for named quartz prospects in Oklahoma, showing the towns of Broken...University of Oklahoma. Figure 2. At Opah, a typical quartz dig in Oklahoma: mud, water, tree roots, snakes...and droplets of blood. Note the large masses of quartz that constituted the margins of the vein. With...recognized symbols of Oklahoma. Beyond these occurrences, however, locations for minerals worthy of collections |  | | Journal (article/letter/editorial) | | diopside, fluorapatite, graphite, âloxoclase,â quartz, titanite, and zircon. Calcite is very common in...thin sections between oligoclase crystal domains. Quartz occurs in âfusedâ crystals to 4 cm in length; rare...a âfusedâ appearance. Probably, both zircon and quartz grew using the spaces between the calcite crystals...notable specimens have been found in Sauerland, Germany (Lapis 27:1), and less-pronounced specimens come...rhombs and the edges of positive scalenahedra. Quartz, fluorite, and stilbite make up this group. Nasik |  | | Journal (article/letter/editorial) | | determinations made of the stable oxygen isotope content of quartz, hematite, and calcite from the Chub Lake prospect...Ocean Water (VSMOW). We conclude that these occurrences formed from groundwaters at a temperature of...of bladed specular hematite and Cumberland-habit quartz are the most common minerals found. Noteworthy...deposits of crystallized specular hematite and quartz were discovered in the Adirondack Lowlands, but...The most common speciesâcalcite, hematite, and quartzâwere easily sight-identified when crystallized |  | | Journal (article/letter/editorial) | | metamorphic Geol., 1998, 16, 189â196 A corundumâquartz assemblage from the Eastern Ghats Granulite Belt...(e-mail: arima@ed.ynu.ac.jp) A B S TR A C T Corundum+quartz-bearing assemblages occur in small lenses in granulite...Granulite Belt, India. Corundum porphyroblasts and quartz coexist with porphyroblastic almandine-rich garnet...hercynite spinel, ilmenite and magnetite. Corundum and quartz are separated by sillimanite or a composite corona...sillimanite inclusions in which irregularly shaped quartz is enclosed. Two distinct reactions are inferred |
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Quartz occurrences, Hippeln, Hasserode, Wernigerode, Harz, Saxony-Anhalt, Germany