chemistry of geothite concretion

Composition nucleation and growth of iron oxide
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Jan 01 2011 0183 32 The goethite rim forms a protective layer of reduced porosity and permeability that inhibits chemical reactions with K-feldspar in the concretion interior with exterior solutions The porosity of the goethite rim is 18 Table 1 reducing permeability by 5 orders of magnitude Chidsey et al 2007...

Structural characteristics of hematite and goethite and
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Résumé eng TEM investigations on goethite and hematite associated with kaolinite in lateritic weathering profiles Cameroon have shown 1 the variability of goethite habit in contrast to hematite according to sampling locality 2 the occurrence of intermediate phases primary or resulting from a topotactic transformation of hematite into goethite 3 intergrowths of hematite and...

FAST AND SLOW PHOSPHATE SORPTION BY GOETHITE
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Mineralogical and chemical properties of the goethite-rich materials 15 Specific surface area AI substitution mole Micro- Fee 5 Ale Feo s FeHa s MCD Jo 6 EGME BET-N2 pores Bou 2 hollow root concretion Qu Ta 390 17 59 410 6 85 17 213 107 0 Bou 5a ferricrete Qu Chr Ta 455 17 59 520 7 70 23 82 62 34...

School of Science Technology UMS SST
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The concretion formation ends with the formation ofbauxite Bardossy Aleva 1990 The bauxite formation rich in concretion was shown in several outcrop of basaltic rock profile in Johor Grubb 1982 Gibbsite boehmite goethite hematite and kaolinite were the secondary minerals found in the...

Concretions Bob Katz
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The word concretion is derived from the Latin con -- meaning together - - and cresco -- meaning to grow These grown together rocks have a variety of origins that require geologists to integrate information from a variety of disciplines including biology chemistry...

Dinosaur with a Heart of Stone Science
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Spheroidal goethite concretions moreover are never primary but rather form by near-surface oxidation of siderite concretions in shale and sandstone Siderite concretions form in the dysaerobic shallow burial zone centimeters to decimeters below the water table as iron-specific bacteria reduce ferric oxyhydroxides 6 contained in clays...

Barite Mineral Uses and Properties
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The uses and properties of the mineral Barite Barite Occurrence Barite often occurs as concretions and void-filling crystals in sediments and sedimentary rocksIt is especially common as concretions and vein fillings in limestone and dolostoneWhere these carbonate rock units have been heavily weathered large accumulations of barite are sometimes found at the soil-bedrock contact...

Garvies Point Museum and Preserve
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The end product is a round reddish concretion Rattle Stones on the other hand are produced by subsurface precipitation of iron oxides around a sediment core typically a lump of clay When this mass dries and solidifies the clay inside will shrink and become loose creating a rattle when the concretion...

Biochemical Characteristics of Organic Matter in a Guano
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A guano concretion previously described in Garrett et al 21 was obtained from a goethite-rich bauxitic soil in Spitzbergen 181268 176 N 774957 W and altitude 732 m in the Manchester Parish Jamaica Upon receipt the sample was thoroughly cleaned by consecutive washes with large amounts of distilled and deionized water and then oven-dried at...

Goethite Mineral Data
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General Goethite Information Chemical Formula Fe O OH Composition Molecular Weight = 8885 gm Iron 6285 Fe 8986 Fe 2 O 3 Hydrogen 113 H 1014 H 2 O Oxygen 3601 O 10000 10000 = TOTAL OXIDE...

Concretion
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A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity ie the spaces between the sediment grains Concretions are often ovoid or spherical in shape although irregular shapes also occur The word concretion is derived from the Latin con meaning together and cresco meaning to grow Concretions form within layers of sedimentary strata that have...

ENVIRONMENTS OF FERROMANGANESE CONCRETIONS
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Boltenkov 2007 The chemical composition of ferromanganese concretions depends on several factors geography of the basin salinity depth rate of sedimentation growth of concretions and redox properties Anufriev et al 2005 Usually there are noticeable differences in the chemical composition of different concretion morphologies...

PDF Models of iron oxide concretion formation Field
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Concretion chemistry Formation of concretions requires that reactants reach goethite and/or hematite if stored underwater even at ambient temperature Schwertmann Cornell 2000...

Geochemistry of laterites stability of Al
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Geochemistry of laterites stability of Al-goethite Al-hematite and Fe super 3 -kaolinite in bauxites and ferricretes an approach to the mechanism of concretion formation Tardy Y Nahon D...

Concretion
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A concretion is a hard This can result in the precipitation of a certain chemical species producing colouring and staining of the rock or the formation of concretions Rock or an iron oxide or hydroxide such as goethite and hematite Goethite is found all over the planet usually in the form of concretions stalactitic formations...

Characterization of Iron
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Iron-manganese concretions are common in upper sola of Alfisols in the Inner Bluegrass Region of Kentucky Their nature and quantities appear to be related to the fluctuation of seasonal perched water tables above clayey argillic horizons This study was conducted to examine changes in the macro-and micromorphology chemistry and mineralogy of concretions as a function of size color and soil...

Composition nucleation and growth of iron oxide
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Iron oxide concretions are formed from post depositional paleogroundwater chemical interaction with iron minerals in porous sedimentary rocks The concretions record a history of iron mobilization and precipitation caused by changes in pH oxidation conditions and activity of bacteria Transport limited growth rates may be used to estimate the duration of fluid flow events...

Concretion
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A concretion is a hard compact mass of matter formed by the precipitation of mineral cement within the spaces between particles and is found in sedimentary rock or soil Concretions are often ovoid or spherical in shape although irregular shapes also occur The word concretion is derived from the Latin con meaning together and crescere meaning to grow...

PDF Models of iron oxide concretion formation field
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In some Concretion chemistry cases there is different iron oxide coloration in the center Formation of concretions requires that reactants reach of some concretions that may be a partial remnant nucleus some level of super-saturation eg nucleation threshold Surface kinetics may also control the rate at which dis- with respect to...

Concretion
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Jan 16 2020 0183 32 A concretion is a hard compact mass of matter formed by the precipitation of mineral cement within the spaces between particles and is found in sedimentary rock or soil Concretions are often ovoid or spherical in shape although irregular shapes also occur The word concretion...

GC1057T Clarksville Concretions Earthcache in Tennessee
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The word concretion is derived from the Latin con meaning with together or joint and cresco -- meaning to grow increase or expand These expanded rocks have a many origins that require geologists to integrate information from a variety of disciplines including biology chemistry soil science meteorology and geology itself...

Hematite concretions from the Late Jurassic Jhuran
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Jan 08 2021 0183 32 The discovery of iron-bearing concretions is one of the exciting discoveries in recent past on Mars We report here an analog terrestrial site hosting...

Corrosion Studies on the USS Arizona with Application to a
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As with Arizona concretion a Siemens x-ray diffractometer was used to scan the cross section of the midget submarine concretion samples from shipside to seaside at distances 003 cm 005 cm 008 cm 013 cm and 017 cm for siderite goethite FeOOH and magnetite 11 The diffractometer was situated on the calculated 2-theta peak for each...

How Utah s Fantastical Moqui Marbles Formed Live Science
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Sep 22 2014 0183 32 The chemical reactions first covered each sand grain with iron creating tiny spher The spheres grew layer by layer making contact with others...

Concretions
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The word concretion is derived from the Latin con -- meaning together -- and cresco -- meaning to grow These grown together rocks have a variety of origins that require geologists to integrate information from a variety of disciplines including biology chemistry...

Oolites Pisolites and Laterites Formation and Composition
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Jun 27 2017 0183 32 Oolite consisting of goethite limonite ooids from Germany Ooids occurring in Ordovician limestone in Estonia are strikingly similar in chemical composition internal structures and REE rare earth elements distribution to modern iron-bearing ooids described from a vicinity of volcanically active island in Indonesia...

Goethite The mineral goethite information and pictures
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Goethite is a common mineral and is a frequent matrix material for other more aesthetic minerals It is usually a dark uninteresting mineral though specimens from a handful of locations especially Colorado are remarkable for their delicate and beautiful crystal growths and velvety botryoidal growths Goethite is also frequent as black crystal sprays that form within geodes on drusy Quartz...

Siderite The mineral Siderite information and pictures
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Siderite is a common mineral and is found worldwide in many different environments Only the most noteworthy will be mentioned here Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains Germany and Panasqueira Portugal...

Rinded iron
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chemistry For example it was the distribution of rinded iron oxide-cemented concretions in the Navajo Sandstone that allowed Loope et al 2010 to delineate the pathways of late-diage-netic CO 2-enriched and CH 4-enriched fluids through porous and permeable strata and to reconstruct the timing of subsequent pore-water oxygenation...

Research on the removal of calcareous and iron concretions
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The concretion was removed using a combination of mechanical and chemical techniques ie a solution of EDTA-2Na in conjunction with a chisel and scalpel were used to remove the concretion from this object Figure 5b shows the iron nail after concretion removal Separation of a...

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