 | | Journal (article/letter/editorial) | | The fine-grained rocks of this deposit contain a treasure of rare, if microscopic, man ganese minerals...three new species. The Bald Knob Manganese Deposit ALLEGHANY COUNTY, NORTH CAROLINA W I L L I A M B . SIMMONS...was written, by request, for the March-April North Carolina issue. However, due to space limitations publication...N O B M A N G A N E S E D E P O S I T is one of North Carolina's most unusual and interesting deposits...This inconspicuous little prospect in western North Carolina has been the source of three new minerals and |  | | Journal (article/letter/editorial) | | pyroxenoidsfrom the manganesedeposit near Bald Knob, North Carolina' Gnnv A. WrNrBn,2 ERrc J. ESSENEeNo Doxero...from a metamorphosedmanganesedepositat Bald Knob, North Carolina, yield estimatesof temperaturesand local...Compositionaldata on coexistingrhodonite and pyroxmangite sriggests that a narrow miscibility gap separatesthe...theseP-Tconditions. The assemblage rhodonite/pyroxmangite-rhodochrosite-quartz requires water-rich fluids...(CoSr), alabandite (MnS), and pyrophanite (MnTiOr) at Bald Krob require a relatively reduced and sulfidizing |  | | Journal (issue) | | 157 by J. Strobbe Manganese minerals of Bald Knob, North Carolina 167 by W. B. Simmons, Jr., D. R. Peacor...found with vuagnatite at Red Mountain, Mendocino County, California (Pabst et al> 1977), has been determined...mcguinnessite spherules from Red M ountain, Mendocino County, California, were analyzed with an ARL EMX- SM...Stanislaus County, California (Bodenlos, 1950), and malachite from Bisbee, Cochise County, Arizona. Other...3Mcguinnessite (this study) from Red Mountain, Mendocino County, California (M g/Cu = 1.17). D(obs.) by suspension |  | | Journal (article/letter/editorial) | | The University of Michigan, Ann Arbor, MI 48109, USA Abstract. Electron microprobe analysis of manganese...bustamite/hedenbergite, bustamite/ rhodonite and rhodonite/pyroxmangite are constrained for middle-upper amphibolite...Geological Survey, 959 National Center, Reston, VA 22092, USA Reprint requests to." P.E. Brown * Contribution No...The University of Michigan, Ann Arbor MI 48109, USA a specific P ( 6 k b a r s ) - T (650 ~ C ) - -...pyroxferroite which limits the iron content of the pyroxmangite structure to less than 70 mole percent FeSiO3 |  | | Journal (article/letter/editorial) | | The occurrence of Mn oxides and rhodonite (pyroxmangite) in a rock makes it possible to constrain the...Mn—manganosite, Br—braunite, Rd—rhodonite, Py—pyroxmangite, Tph—tephroite, Qtz—quartz. The heavy segments...braunite (Br) Mn7SiO12, rhodonite (Rd) Mn5(Si5O15), pyroxmangite (Py) Mn7(Si7O21), tephroite (Tph) Mn2(SiO4)...associations are those of quartz + rhodonite (pyroxmangite), pyroxmangite + tephroite, and braunite + hausmannite...braunite, bixbyite, hausmannite, rhodonite (pyroxmangite), and quartz. This segment can be appended by |  | | Journal (article/letter/editorial) | | pages 951-959,1963 Mn'humites from Bald Knob, North Carolina: mineralogy and phaseequilibriat G. A...sonolitehave beenfound in the Bald Knob manganese deposit of North Carolina. These mineralsare the manganeseanaloguesof...stabilizeone manganese humiterelativeto another.The Bald Knob humitescoexistwith rhodonitesand manganese carbonates...formation. Introduction The Bald Knob manganese depositin AlleghanyCounty, North Carolina has been shown by Simmons...experimentaldata and thermodynamic calculations. The deposit is characterized by both silica-rich and carbonate-richbulk |  | | Journal (volume) | | 2013.18G.M.1. BACK COVER: Bob King admiring a fine North Pennine fluorite at the British Mineral and Gem...Hemimorphite replacements of rugose corals from Swaledale, North Yorkshire Brian Young 17-19 PAPERS ‘Cellular’...Zircon pyroxenite from Upper Badcall, Sutherland, North-west Scotland Andy Moffat and Roy E. Starkey 64-67...contributions on aspects of the mineralogy of the North Pennine Orefield. Then, following Frank’s review...‘black blobs’ in Leicestershire, the focus shifts to North Wales with articles on the complex and intriguing |  | | Journal (article/letter/editorial) | | them. One exception is the world-class manganese deposit of Nsuta with reserves of 5 million tonnes of oxide...Nangodi and Lawra belts, and of the Nsuta manganese deposit. Early Proterozoic (Birimian) rocks of Ghana are...In Ghana, six parallel greenstone belts trending north to northeast are recognized. The Nangodi belt in...manganese-rich banded iron formation of the Cuyuna North range, Minnesota (McSwiggen et al., 1994), and three...categories of feldspars from the Otjosondu manganese deposit, Namibia (Viswanathan and Kielhorn, 1983), are |
|
