 | Cristiano, Elena, Hu, Yung-Jin, Siegfried, Matthew, Kaplan, Daniel, Nitsche, Heino (2011) A Comparison of Point of Zero Charge Measurement Methodology. Clays and Clay Minerals, 59 (2) 107-115 doi:10.1346/ccmn.2011.0590201 | Journal (article/letter/editorial) | | One Cyclotron Rd., Berkeley, California 94720, USA 2 University of California, Berkeley, Department...Chemistry, 420 Latimer Hall, Berkeley, California 94720, USA 3 Savannah River National Laboratory, Savannah River...River Site, Aiken, South Carolina 29808, USA Abstract—Contaminant-transport modeling requires information...be magnified greatly. Goethite (a-FeOOH) and pyrolusite (b-MnO2) are ubiquitous mineral phases that are...zero charge (PZC) using different methods. The pyrolusite PZC was measured with three methods: mass titration |  | | Journal (article/letter/editorial) | | Millersville University, Millersville, PA 17551-0302, USA Department of Geological Sciences, 206 Natural Science...State University, East Lansing, Michigan 48824-1115, USA Environmental Protection Division, Los Alamos National...Alamos, NM 87544, USA 4 Celerity, 4720 Gettysburg Rd., Suite 204, Mechanicsburg, PA 17055, USA 2 3 Abstract—Secondary...compositions when they contain goethite, kaolinite, and pyrolusite. However, this combination requires specific...Hydrologic Laboratory (CHL) in western North Carolina, USA, using the Pilling-Bedworth criterion (Velbel, 1993) |  | Halbach, P., Gursky, H.-J., Gursky, M.M., Schmidt-Effing, R., Maresch, W.V. (1992) Composition and formation of fossil manganese nodules in Jurassic to Cretaceous radiolarites from the Nicoya Ophiolite Complex (NW Costa Rica) Mineralium Deposita, 27 (2) doi:10.1007/bf00197101 | Journal (article/letter/editorial) | | They are characterized by braunite, hollandite, pyrolusite and quartz as well as 39-61% Mn, 0.9-1.6% Fe...thermometamorphic (braunite) and hydrothermal (hollandite, pyrolusite) events. Petrographic similarities between the...(Table 1) identified by X-ray phase analysis are pyrolusite, braunite and hollandite; quartz is mainly localized...nodules from the Pacific Ocean Fossil nodules Pyrolusite: fl-MnO2 (tetragonal) Hollandite: (Ba,K)1 _2...nodules indicate that the main mineral phases pyrolusite, braunite and hollandite are of secondary origin |  | Bhoja, Sharath Kumar, Tripathy, Sunil Kumar, Murthy, Yanamandra Rama, Ghosh, Tamal Kanti, Kumar, C. Raghu, Chakraborty, Deba Prasad (2021) Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study. Minerals, 11 (2) 150 doi:10.3390/min11020150 | Journal (article/letter/editorial) | | minerals in both the ores are rich in cryptomelene, pyrolusite, psilomelane, and bixybyite. Similarly, the major...Psilomelane BaMn8 O16 (OH)4 5.14 0.004 P Pyrolusite MnO2 4.73 0.004 P Rhodochrosite MnCO3 ...are romanechite/cryptomelene, with occasional pyrolusite. Mn-ore’s strata-bound categories are mostly...massive due to repetitive precipitation [40]. Pyrolusite, and cryptomelene with sub-ordinate lithioph...bodies get oxidized locally, and get enriched in pyrolusite. Such ores are usually of a high-grade type, |  | | Journal (article/letter/editorial) | | in the Abstract: In this study, we have compiled new and existing mineralogical and geochemical data on...Varnavas), Evia and Milos islands], aiming to provide new insights on the genesis of Fe-Mn mineralization in...Mn-deposit in Attica (e.g., [21,22]). We present new major and trace elements analyses of bulk ore and...and in Attica (e.g., [21,22]). We present new major and trace elements analyses of bulk ore back scattered...1303 3 of 19 characteristics, aiming to provide new insights on the genesis of Fe-Mn mineralization and |  | Fendorf, Scott, Jardine, Philip M., Patterson, Ronald R., Taylor, David L., Brooks, Scott C. (1999) Pyrolusite surface transformations measured in real-time during the reactive transport of Co(II)EDTA2−. Geochimica et Cosmochimica Acta, 63 (19) 3049-3057 doi:10.1016/s0016-7037(99)00232-x | Journal (article/letter/editorial) | | Copyright © 1999 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/99 $20.00 ⫹ .00 Pergamon...Pergamon PII S0016-7037(99)00232-X Pyrolusite surface transformations measured in real-time during...83844-2339, USA Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA (Received...reduced to Mn(III) which forms an ␣-Mn2O3 layer on pyrolusite. This layer passivates the surface after an initial...processes may be diminished by continual exposure to pyrolusite—an advantage from an environmental quality perspective |  | | Report (chapter) | | laminated aggregates encrusting vugs, and replacing pyrolusite and todorokite in massive deposits of the Falakron...1986; Nevada USA, Carlos et al. 1993) and travertines, limestones or marbles (North Dakota USA, Hewett &...polars. Scale bar is 50 #m. (b) Fine-grained pyrolusite (p) is partly replaced by encrustation of an...presence of subhedral to euhedral, coarse, tabular, pyrolusite (up to 50#m across), lining the margins of karstic...Finegrained (up to 15 #m long) material resembling pyrolusite occurs in the interior (central part) of the |  | | Journal (article/letter/editorial) | | Springer-Verlag 1974 Characterization of Natural Pyrolusite by Electron Microscopy K. P. S t a u d h a m...Materials Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 Received...Socorro County, New Mexico Area, has been referred to as psilomelane or pseudo-pyrolusite. X-ray diffraction...the tetragonal (a ~ 4.42 A, c ~ 2.87 A) Mn02 (pyrolusite) structure; with a-Mn enrichment. Detailed examinations...e oxide deposits which are characteristically pyrolusite, a n d contain mineral forms h a v i n g v a |  | | Journal (article/letter/editorial) | | the uppermostparts, by psilomelane,cryptomelane,pyrolusite,corohaditc, etc. (mainly Mn4+) in which psilomelaneis...carbonates(rhodochrosite), or higher oxides (pyrolusite, cryptomelane,manganite, psilomelaneetc.), the...COMPOSITION OF THE IMPORTANTMANGANESE MINERALS. PYROLUSITE -- Mn02 RAMSDELLITE -- MnO2 CRYPTOMELANE...rekaCounty,NevadaandLunaCounty,New Mexico Nevada, Leadville, Coloradoand Silver City, New (Hewett and Fleischer...rhodonite andalabandite, formedthe Socorro County, New Mexico). The manganese originalminerals,onlyto be |  | | Journal (article/letter/editorial) | | showing concretion formed by cryptomelane (c) and pyrolusite (p). (Ribeiro and Carvalho, 2002; Ribeiro, 2003)...Centre, Oregon State University Reactor, Oregon, USA. After a cooling-off period of three weeks, three...alternated layers of cryptomelane and voids (v). Pyrolusite (p) occurs in the center of the concretion. (C)...Mn-concretion formed by layers of cryptomelane and pyrolusite. Hematite and goethite (g) occur in the center...generations of pyrolusite. (h) Botryoidal texture showing alternation between pyrolusite and goethite. |  | | Journal (article/letter/editorial) | | This article was downloaded by: [New York University] On: 24 March 2015, At: 14:11 Publisher: Taylor...I. Potkonen and D. V. Tabagari Downloaded by [New York University] at 14:11 24 March 2015 Translated... INTERNATIONAL GEOLOGY REVIEW Downloaded by [New York University] at 14:11 24 March 2015 Several typical...Sidorenko, VIMS) and have been identified as mainly pyrolusite, with less common psilomelane. These composi...which is also typical of 1446 Downloaded by [New York University] at 14:11 24 March 2015 M. M. MSTISLAVSKIY |  | | Journal (article/letter/editorial) | | biogeochemical origin described in this paper, suggest a new concept of manganese oxide pisolith and oolith formation...ferro-alloy production plant in Tasmania or at BHP's two New South Wales steelworks. The orebody consists essentially...and ooliths (Fig. 1 ), composed of layers of pyrolusite, romanechite, vernadite, todorokite and cryptomelane...pointing to a biogeochemical origin instead, lead to a new concept of manganese oxide pisolith and oolith origin...cases the pyriform bodies occur as pyrolusite in a matrix of pyrolusite. The writer believes that this structure |  | Fredrickson, James K., Zachara, John M., Kennedy, David W., Liu, Chongxuan, Duff, Martine C., Hunter, Douglas B., Dohnalkova, Alice (2002) Influence of Mn oxides on the reduction of uranium(VI) by the metal-reducing bacterium Shewanella putrefaciens. Geochimica et Cosmochimica Acta, 66 (18) 3247-3262 doi:10.1016/s0016-7037(02)00928-6 | Journal (article/letter/editorial) | | Copyright © 2002 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/02 $22.00 ⫹ .00 Pergamon...Northwest National Laboratory, Richland, WA 99352, USA Westinghouse Savannah River Company, Savannah River...River Technology Center, Aiken, SC 29808, USA (Received October 12, 2001; accepted in revised form April...investigated using synthetic Mn(III/IV) oxides (pyrolusite [-MnO2], bixbyite [Mn2O3] and K⫹-birnessite...[K4Mn14O27 䡠 8H2O]). In the absence of bacteria, pyrolusite and bixbyite oxidized biogenic uraninite (UO2[s]) |  | Chukanov, Nikita V., Varlamov, Dmitry A., Pekov, Igor V., Zubkova, Natalia V., Kasatkin, Anatoly V., Britvin, Sergey N. (2021) Coupled Substitutions in Natural MnO(OH) Polymorphs: Infrared Spectroscopic Investigation. Minerals, 11 (9) 969 doi:10.3390/min11090969 | Journal (article/letter/editorial) | | general formulae (i) (Mn4+ , Mn3+ )O(OH,O), with pyrolusite as the Mn4+ O2 end-member, and (ii) (Mn3+ , M2+...of pyrolusite [13]. Groutite transforms into the tetragonal rutile-type MnO2 polymorph pyrolusite upon...derivative of the pyrolusite structure. Partial substitution of Mn4+ with Mn3+ in pyrolusite with charge compensation...results in the formation of pyrolusite [10]. Pseudomorphs of pyrolusite after manganite crystals are...MnO2 1 × 2 tunnel structure, and the densest pyrolusite MnO2 1 × 1 tunnel structure, respectively. This |  | | Report (issue) | | sedimentary-manganese deposits of the western Cordillera of the USA and other circum-Pacific areas. This progress report...oxides of the Three Kids Mine, Nevada are mainly pyrolusite with some todorokite, cryptomelane, and ramsdellite...principally romanechite with some cryptomelane, pyrolusite, and hollandite. It is evident that neither mineralogy...Todorokite Pyrolusite Pyrolusite + Todorokite Pyrolusite Pyrolusite + Todorokite Pyrolusite (50) + Todorokite...(50) Pyrolusite Pyrolusite Pyrolusite + Todorokite (Trace) Pyrolusite (92%) + Quartz Pyrolusite Pyrolusite |  | | Journal (article/letter/editorial) | | Mosaic Tesserae:Inclusions A New Technological Glass Mosaic Tesserae: A New Technological Marker? Marker...glass mosaics untiluntil now,now, and and provide new new insights on the nature of these inclusions, identified...crystalline, new-formed phases, of analytical results shows that inclusions are crystalline, new-formed phases...hypothesize pyrolusite, MnO2, as between 1000 and 1150 C, and to hypothesize pyrolusite, MnO2 , as the... potential technologicalinclusions marker. as a new potential technological marker. Keywords: late-Antique |  | | Journal (article/letter/editorial) | | diagenetic (type A) manganese nodules composed of pyrolusite and hollandite laminae and phosphorite lenses...precipitating minerals. Uranium is enriched in both the pyrolusite and hollandite laminae of type A nodules, but...Thermodynamic calculations of the relative stabilities of pyrolusite and hollandite suggest that the pH conditions...adsorption to inhibit its uptake relative to pyrolusite. 1. Introduction The Timna Formation, Timna...4%) associated with manganese minerals (mainly pyrolusite). The purpose of this study is to understand |  | | Journal (article/letter/editorial) | | Legrena valley, SW Lavreotiki, aiming to provide new insights on that type of Fe-Mn-mineralization. The...and trace elements composition, aiming to provide new insights into this type of Fe-Mn-mineralization....mostly of bacteriomophic Mn-Fe hydroxides and pyrolusite (Figures 2–5). location of the studied Fe-Mn-mineralization...fossilized bacteria and/or removed mold spheroidals on pyrolusite crystals (pyr) is remarkable (5f; see Table 2)...2). removed mold spheroidals on pyrolusite crystals (pyr) is remarkable (f; see Table 2). Table 2. Representative |  | | Book (volume) | | 1½ mi. on buttes to Sagate, jasper; 7.4 mi. to new hwy. Cuts in badlands area, land surfaces to Ngem...dumpsPyrite; Stony Cr., a mine in black shalePyrite, Pyrolusite. CLAIBORNE COUNTY AREA, Lead mine on Lake NorrisGalena...NorrisGalena, Hydrozincite (fluorescent), Sphalerite. NEW TAZEWELL, SW 5 mi., the Straight Creek dist., area...Smithsonite (locally called dry bone), Sphalerite. NEW MARKET, extensive area minesSmithsonite. KNOX COUNTY...both sides of rd.brown jasper (patterned with Pyrolusite); (b) mines and dumps of the Bumpass Cove dist |  | Li, Da, Jiang, Xunxiong, Wang, Shengdong, Sun, Xudong, Zhao, Feng, Feng, Linyong, Zhang, Denggao (2022) Research on Recovery of Valuable Metals from Cobalt-Rich Crust Using Carbon as a Reduction Agent during the Acid Baking Process. Minerals, 12 (10) 1215 doi:10.3390/min12101215 | Journal (article/letter/editorial) | | Clara, CA, USA). eter (ICP-OES, Agilent 700, Agilent Technologies, Inc., Santa Clara, CA, USA). The high...St Joseph, MI, USA) was used to determine the contents sulfur and carbon. Joseph, MI, USA) phase was used...microscopy (SEM, QUANTA 600, FEI Company, Hillsboro, OR, USA) with energy disand chemical analyses of samples...Inc., Mahwah, NJ, USA). The gas QUANTA 600, FEIcomponents Company,ofHillsboro, OR, USA) with energy dispersive...(EDS, EDAX genesis 7000, EDAX Inc., Mahwah, NJ, USA). The gas components of Technolothe analyzer (Gasmet |  | | Journal (article/letter/editorial) | | minerals recorded are cryptomelane, romanechite, pyrolusite, with minor amounts of jacobsite, hausmannite...> 40% Mn and mostly consist of cryptomelane, pyrolusite and romanechite with or without goethite and...secondary manganese minerals like cryptomelane and pyrolusite. 81 Fig. 2 a Interbanded manganese ore body...dominantly composed of cryptomelane and pyrolusite. Cavity filling of pyrolusite is very distinct. d Botryoidal...occasional white patches. In addition to cryptomelane, pyrolusite and romanechite, they contain silicate gangue |  | | Journal (article/letter/editorial) | | (hydrothermal veins). (d) Tetravalent manganese oxides (pyrolusite, cryptomelane, manjiroite, nsutite) (supergene)...sediments are generally similar to those of the New England Fold Belt (NEFB) to the south (part of the...closely related to the geological structure of New Zealand and New Caledonia i.e. an exotic terrane (Murray...rocks of coastal, S. E. Queensland form part of the New England Fold Belt, the easternmost section of the...sequence is essentially similar to that of the general New This sample differs from the previous in being a |  | | Journal (article/letter/editorial) | | Arizona State University, Tempe, Arizona 85287-1404, USA Correspondence to: L.A.J. Garvie mine the oxidation...sample during acquisition thus continuously exposing new material to the electron beam. After the core-loss...norrishite gaudefroyite bixbyite ramsdellite pyrolusite chalcophanite asbolan todorokite braunite hausmannite...a change in the spectrum shape which may include new final states that were forbidden in spherical symmetry...difference varies from 2.6 eV m ramsdellite and pyrolusite to 2.1 eV in SrMnO3. SrMnOa forms an undistorted |  | | Journal (article/letter/editorial) | | composed of manganite [MnO(OH)], groutite [MnO(OH)], pyrolusite (MnO2), lithioporite (Al,Li) MnO2(OH)2, and hollandite...Mn layers, manganite recrystallization to be pyrolusite along veinlets cutting manganite and lithioporite...weak, brittle, black Mn ore and identified as pyrolusite; Second, it is massive, black to blackish grey...handspecimen, and (d) Crushed Mn ore identified as pyrolusite. a b c d Figure 6. Photograph of (a) and...Handspecimen of manganese layers identified as pyrolusite. Figure 7. Photograph of Manganese layer handspecimen |  | | Journal (article/letter/editorial) | | there exists a random microscopic intergrowth of pyrolusite (1 1) tunnels and ramsdellite (2 1) tunnels...heat-treatment step is a phase change from -MnO2 towards pyrolusite ( -MnO2), J. Appl. Cryst. (2013). 46, 1283–1288...in that work by the pyrolusite content, Pr, which is the fraction of pyrolusite domains) was one of the...tetragonal unit cell, the arrangement reported for pyrolusite (Baur, 1976). Material composition was determined...EMD and CMD samples with similar ramsdellite/pyrolusite phase compositions, we observed that manganese |
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