 | | Journal (issue) | | BRITAIN GEMMOLOGICAL ASSOCIATION OF GREAT BRITAIN SAINT DUNSTAN'S HOUSE, CAREY LONDON, EC2V 8AB LANE ...F.G.A. Assistant Secretary. D. Wheeler, F .G.A. Saint Dunstan's House, Carey Lane, London EC2\' 8AB (By...A., *and Dr K. SCHMETZER† *Meggen, Lucerne, Switzerland. †Heidelberg, West Germany. INTRODUCTION Very...Gemstones, Zurich, Switzerland.‡Mineralogisches Institut der Universität Basel, Switzerland. ABSTRACT Natural...hardness, and was bought by E. Giibelin, of Meggen, Switzerland. The investigations of this gemstone with modern |  | | Journal (article/letter/editorial) | | deGen•ve, 13,ruedes' Maraichers, 1211Gen•ve 4, Switzerland AND MICHEL MALO InstitutNational dela Recherche...Grenvillian basement ? .,v volcanic-hosted Pb-Zn occurrence polymetallic Cu-Pb-Zn-Ag-Au skamprospects A...(1993)suggested thattheskarnpros- Volcanic-hosted Pb-Zn occurrence pectsaregenetically relatedto Devonian intrusive...Cordillera. and2øsPb/•ø4pb ratios,respectively. The Saint-Andr•-de-Restigouche goldoccurrence (loc.G, Lea...consists of quartzandgalena, withsubsidiary pyrite, occurrence by Schrijver et al. (1988)hasyieldeda similar |  | | Report (issue) | | PYRITE IN THE SPRINGFIELD COAL MEMBER (V) PETERSBURG FORMATION SULLIVAN COUNTY, INDIANA Special Report...GEOLOGICAL SURVEY JOHN B. PATTON, State Geologist MAURICE E. BIGGS, Assistant State Geologist MARY BETH FOX...IVERSON, Geological Assistant GEOPHYSICS SECTION MAURICE E. BIGGS, Geophysicist and Head ROBERT F. BLAKELY...Head DONNA C. SCHULTZ, Sales and Records Clerk Pyrite in the Springfield Coal Member (V) Petersburg Formation... . . . . . . . Distribution and association of pyrite in the Springfield Coal Member (V) . . . . . . |  | Cardenes, Victor, Merinero, Raúl, Rubio-Ordoñez, Álvaro, Cnudde, Veerle, García-Guinea, Javier, Pitcairn, Iain K. (2020) A Morphological and Size-Based Study of the Changes of Iron Sulfides in the Caples and Torlesse Terranes (Otago Schist, New Zealand) during Prograde Metamorphic Evolution. Minerals, 10 (5) 459 doi:10.3390/min10050459 | Journal (article/letter/editorial) | | the shape of these iron sulfides. Keywords: micro-pyrite; framboids; micro-tomography; size distribution;...Introduction Microscopic iron sulfides (mainly pyrite and pyrrhotite, together with marcasite and greigite)...geochemical evolution, geological meaning and occurrence of iron sulfides. However, the turning points...2] who proposed a feasible model for framboidal pyrite formation. They also proposed a method to infer...continued working with populations of framboidal pyrite [1–7] applied to the determination of paleo-conditions |  | Zhang, Chunguang, Wang, Jun, Feng, Mingshi, Shi, Zhiqiang, Xiang, Fang, Hou, Mingcai, Yang, Shuai, Kneller, Ben, Chen, Hongde (2021) Petrological Composition of the Last Coal Seam in the Longmendong Section before the End-Permian Mass Extinction. Minerals, 11 (11) 1230 doi:10.3390/min11111230 | Journal (article/letter/editorial) | | quartz, chamosite and pyrite. The pyrofusinite and carbon microparticles occurrence modes could have been...areas. The β-tridymite occurrence modes and the high proportions and occurrence modes of magmatic quartz...accumulation period. The chamosite and quartz occurrence modes suggest that they primarily precipitated...nearby Emeishan basalt. The pyritic coal balls occurrence modes in the C1 coal seam are likely the result...© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed |  | | Journal (article/letter/editorial) | | elsevier.com/locate/gca Framboidal and idiomorphic pyrite in the upper Maastrichtian sedimentary rocks at...genetic implications to the origin of framboidal pyrite Mamdouh F. Soliman a,⇑, Ahmed El Goresy b a Geology...moderately enriched in syngenetic and diagenetic pyrite. Pyrite occurs mostly as layers or bands, group of...pockets, burrow fills and disseminated individual pyrite framboids and crystals within the host sediments...consist mostly of unconsolidated to compact-oriented pyrite (oriented along the bedding planes) in gypsiferous–clayey |  | Chen, Binghan, Deng, Jun, Wei, Hantao, Ji, Xingzhong (2019) Trace Element Geochemistry in Quartz in the Jinqingding Gold Deposit, Jiaodong Peninsula, China: Implications for the Gold Precipitation Mechanism. Minerals, 9 (5) 326 doi:10.3390/min9050326 | Journal (article/letter/editorial) | | was Qa and Qb quartz that recrystallized around pyrite or overgrew and appeared different from Qa and...Qb in CL images. Qd occurred within fractures in pyrite. Qa formed prior to the mineralization of gold...during mineralization. Sericites occurred with pyrite in fractures in the quartz, and some, along with...fractures in pyrite. Free gold occurred within Qa, Qb, Qc, and in brittle fractures in pyrite. Qc had the...Sericitization could indicate a potential gold occurrence. The Ti content decreased from Qb to Qc, indicating |  | | Book (edition) | | anoctahedral sphalerite crystal and on a cubic pyrite crystal. various other properties. For example...Likewise, the striation on the cube faces of a pyrite crystal makes it possible to assign it to a lower...tristetrahedron DIPLOIDAL 2/m3 C-3A2.4A3-3P tetrahedron pyrite hauerite skutterudite diploid pentagonal dodecahedron... I Example of pseudomorphism: limonite after pyrite (Brazil) transformations are possible in the laboratory...though perhaps similar chemical composition (e.g., pyrite by limonite, or azurite by malachite). (Sometimes |  | Ghiran, Maria Doina, Popa, Mihai Emilian, Mariș, Izabela, Predeanu, Georgeta, Gheorghe, Ștefania, Bălănescu, Niculina Mihaela (2023) Thermal Maturity and Kerogen Type of Badenian Dispersed Organic Matter from the Getic Depression, Romania. Minerals, 13 (2) 202 doi:10.3390/min13020202 | Journal (article/letter/editorial) | | © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed... Minerals 2023, 13, 202 3 of 22 Figure 1. (a) Occurrence of the studied area (Google Earth source); (b)...I—inertinite; F—fusinite; In—inertodetrinite; Py—pyrite; Sd—siderite; B—bioclasts. No. Well 1 A-1 Grădis...origins liptinite in a mineral groundmass with pyrite. Reflected light (RL: figures A,C,E) and fluorescence...fluorescence (FL: figures B,D,F), oil immersion, 500×. Py: pyrite, MC: mineral carbonate. Figure 6. Photomicrographs |  | Buckman, Jim, Aboussou, Anabel, Esegbue, Onoriode, Wagner, Thomas, Gambacorta, Gabriele (2020) Fine-Scale Heterogeneity of Pyrite and Organics within Mudrocks: Scanning Electron Microscopy and Image Analysis at the Large Scale. Minerals, 10 (4) 354 doi:10.3390/min10040354 | Journal (article/letter/editorial) | | minerals Article Fine-Scale Heterogeneity of Pyrite and Organics within Mudrocks: Scanning Electron...mudrock, which are here illustrated and discussed for pyrite and organic content at the larger (thin-section)...analysis, for average organic carbon and percentage pyrite. Keywords: mudstones; high-resolution; large area...means of visualising heterogeneity in mineralogy (pyrite, organics, carbonates, silicates, etc.) and porosity...examine two groups of mudrock samples, one looking at pyrite distribution, and the other at organic material |  | | Book | | ical properties. Figure 1. Pyrite from Huanzala, Huanuco, Peru. Pyrite is one the most common minerals...{210}; the form is also called a pyritohedron after pyrite. The general form {hkl} is a didodecahedron (2...(2 x 12 faces), also known as a dip- loid. Pyrite is the best-known example of this class. The class...forms that unequivocally point to a specific class. Pyrite is often found as cubes. Striation of cube faces...symmetry; (ii) four twofold axes lying in Figure 33. Pyrite with {210} from Huanzala, Huanuco, Peru. The faces |  | | Journal (article/letter/editorial) | | Crystallization on Fractured and Polished Colloform Pyrite Surfaces: A Migration Pathway of Trace Elements...2019 Abstract: The colloform pyrite variety incorporates many trace elements that are...the environment during rapid oxidation. Colloform pyrite from the Chiprovtsi silver–lead deposit in Bulgaria...ablation inductively coupled plasma mass spectrometry. Pyrite is enriched with (in ppm): Co (0.1–964), Ni (1...minerals contain not only inherited elements from pyrite (Cr, Fe, Co, Ni, Cu, Zn, Ag, In, As, Sb, Hg, Tl |  | | Journal (article/letter/editorial) | | U/Si ratio is twice as low as in coffinite. The occurrence of oxide pitchblende mineralization has been...shown that enrichment in uranium is caused by the occurrence of titanium minerals in host rocks. It is precisely...species proved unidentifiable due to their discrete occurrence (Khalezov, 2003). The aforementioned U–Ti mineralization...significance, is not typical of exogenic deposits. The occurrence of U-titanates at the hydrogenic infiltration...are often recorded in ore aggregates, likely mark pyrite grains characteristic of ore samples. The results |  | | Journal (article/letter/editorial) | | The relationship between euhedral and framboidal pyrite in base-metal sulphide ores JOSEPH OSTWALD AND...Specimens of layered baryte containing a range of pyrite forms, including framboids, framboidal aggregates...microanalysis (EPMA). These investigations showed that the pyrite occurred in two forms--an arsenical variety containing...approximately 5 % arsenic in solid solution within the pyrite and a non-arsenical variety. EPMA studies indicate...exist between these forms. THE common occurrence o f euhedral pyrite in sulphide ores and in their country |  | | Journal (article/letter/editorial) | | DEPOSITA ©by Springer-Verlag 1977 Notes on Framboidal Pyrite from Allandale New South Wales, Australia J. Ostwald...Shortland, NS.W. 230? Australia Pyrite masses composed of compacted pyrite framboids in chalcedony in weathered...colloidal origin and contemporaneous deposition of pyrite and silica. Free framboids and framboidal clusters...crystallization into pyrite polyhedra and pyrite octahedra. INTRODUCTION Framboidal pyrite represents a common...of iron sulphide in sedimentary rocks, and its occurrence in association with sulphide ore deposits in |  | | Book | | a Mineral? 12 Streak 27 Composition 13 Occurrence and Localities 29 Characteristics IS Identification...Selenite 112 Contents 7 SULPHIDES 118-129 Pyrite 120 Marcasite 122 Lollingite 124 Galena ...crystals, specific gravity, luster, streak, and occurrence—are discussed in detail below. Quartz and Vyrite...Barite 4.5 Molybdenite 4.7-4.8 Marcasite 4.8 Pyrite 5.1 Hematite 5.3 Vanadinite 6.6+ Cassiterite...simply scratch the plate. 27 Introduction Occurrence and Localities Although rocks and minerals surround |  | | Journal (article/letter/editorial) | | include Fe hydroxides (oxides), REE-rich phosphates, pyrite, galena, sphalerite, chalcopyrite, stibnite, barite...the formation of sulfide minerals; in particular, pyrite, sphalerite, galena, and barite inclusions are...monazite [Rudmin et al., 2018]. The nearest ore occurrence with monazite is the Tuganskoye zircon-ilmenite...Resources of Russia, vol. 2. Western Siberia. VSEGEI, Saint-Petersburg, p. 477 (In Rus). Pologova, N.N., Lapshina...elements in two peat bog profiles (Jura Mountains, Switzerland). Chem. Geol. 138, 25–53. https://doi.org/10 |  | | Report (issue) | | Meules Cap aux Meules calcite occurrence Cap aux Meules gypsum occurrence Cap au Taureau occurrences Fatima...Baie du Sud occurrence Île du Havre aux Maisons Anse à Damase occurrence Butte Ronde occurrence Chemin des...Head Île de la Grande Entrée Boudreau Island occurrence 26 26 27 27 27 28 30 30 Cap-aux-Meules to Havre-Aubert...Collines de la Demoiselle Collines de la Demoiselle occurrence 31 31 33 33 33 34 Sandy Hook Dune Île du Havre...amethyst occurrence Middle Cove, Outer Cove occurrences Torbay quarry Bauline Road occurrence Quidi Vidi |  | | Book | | System of mineral classification 8 Origin and occurrence of minerals 8 Associated minerals 11 Properties...Lastly, data on the genesis, associated minerals, occurrence and application are included. The tabulated section...the minerals in this book as well. Origin and occurrence of minerals In order to gain some knowledge of...the upper oxidation zone, sulphur compounds (eg pyrite, chalcopyrite, galena and sphalerite) c.:hange...certain mineral deposit or rock, and eliminate the occurrence of some others. Examples of associated minerals |  | | Journal (article/letter/editorial) | | County Pyrophyllite, cacoxenite, diaspore, sericite, pyrite, ilmenite, topaz, and chert are found at the Snow...of Amelia. Molybdenite, malachite, sphalerite, pyrite, chalcopyrite, galena, anglesite, and cuprite can...actinolite, garnet, hornblende, siderite, chalcopyrite, pyrite, cuprite, native copper (in the biotite), arsenopyrite...the Cline mine, north of Mt. Pleasant (siderite, pyrite, scheelite, and chalcopyrite); the Snyder mine... siderite, and pyrite); the Silver Shaft, 8.3 miles northeast of Mt. Pleasant (pyrite, chalcopyrite, |  | Foley, Nora K., Caddey, Stanton W., Byington, Craig B., Vardiman, David M. (1993) Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado. Professional Paper 1537. US Geological Survey doi:10.3133/pp1537 | Report (issue) | | .............................................. Pyrite..................................................minerals + quartz and (2) magnetite + hematite + pyrite + quartz. A younger crosscutting association contains...quartz. Quartz, manganese-rich calcite, and trace pyrite line late-stage vugs. Mineralogic, lead-isotopic...central parts of the district. The local and early occurrence of the manganese and gold assemblages may indicate...approximately equal; { }, distribution unknown, local occurrence; [ ], molds] Stage North Amethyst vein mineral |  | | Journal (article/letter/editorial) | | stringers of talc, associated with apatite and minor pyrite, are contained within generally saccharoidal dolomite-quartz...most commonly with pyrite and apatite (Fig. 5), although pyrite-quartz and pyrite-apatite-quartz assemblages...apatite and pyrite, and individual talc crystals reach 1 mm or more in length. Apatite and pyrite consistently...talc-bearing zones. The talc-apatite-pyrite assemblage is limited in occurrence to thin (average thickness 250-500...giving the appearance of talc-lined fractures. Talc-pyrite-apatite may continuously occupy the stringers (Fig |  | | Journal (article/letter/editorial) | | NATURE AND ORIGIN ST. LAWRENCE OF THE PYRITE AND JEFFERSON NEW YORK DEPOSITS OF COUNTIES,................................................. Pyrite deposits............................................................................. Mode of occurrence ...............................................336 $37 338 338 339 340 340 341 Structure of the pyrite veins ........................................................................... Origin of the pyrite deposits...................................... |  | | Journal (article/letter/editorial) | | monosulfide that is subsequently transformed into pyrite. Hydrogen sulfide and/or monosulfide migrate into...recrystallization of aragonite or replacement of shells by pyrite. The well-preserved conchiolin microstructure was...biochemical decomposition. 571 i g FORMS OF PYRITE OCCURRENCE IN MOLLUSK SHELL i The author of the present...present paper investigated the distribution of pyrite in fossil mollusk shells in the Jurassic ammonite...clayey–carbonate matrix crosscut by a network of pyrite veinlets from 0.n to 1 mm thick. The general pattern |  | Rečnik, Aleksander, Zavašnik, Janez, Jin, Lei, Čobić, Andrea, Daneu, Nina (2016) On the origin of 'iron-cross' twins of pyrite from Mt. Katarina, Slovenia. Mineralogical Magazine, 80 (6) 937-948 doi:10.1180/minmag.2016.080.073 | Journal (article/letter/editorial) | | 937–948 On the origin of ‘iron-cross’ twins of pyrite from Mt. Katarina, Slovenia ALEKSANDER REČNIK1...Editor: Martin Lee] ABSTR ACT Iron-cross twins of pyrite are well known among mineralogists, however it...unexplored. To address this question we studied pyrite twins from the Upper Permian silts of Mt. Katarina...geological environments for twinned pyrite. Mineralization of pyrite starts with a reduction of the primary...magnetite crystallization is observed prior to pyrite crystallization, which indicates a gradual reduction |
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