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Topic: Siderite


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In the News (Sat 15 Jun 19)

  
  SIDERITE (Iron Carbonate)
The word siderite is used in a number of rarer minerals and except in the fact that they all contain iron, they are otherwise unrelated to siderite.
Siderite is roughly the equivalent of calcite but with iron replacing the calcium.
Siderite is fairly easy to distinguish from calcite by its higher specific gravity and hardness and less vigorous reaction to acids.
mineral.galleries.com /minerals/carbonat/siderite/siderite.htm   (499 words)

  
  siderite.htm
DODGE COUNTY: Siderite is a sparse component of the oolites and matrix of the Neda iron formation, as mined in the east 1/2 NW sec.
Siderite occurs with magnetite and hematite in drill core and small pits in the Pine Lake area in sec.
RUSK COUNTY: Siderite is a heavy mineral in the Barron Quartzite,as exposed in Rusk and adjacent Sawyer Counties (Ernst, et.
www.uwrf.edu /~wc01/siderite.htm   (681 words)

  
 Siderite - Wikipedia, the free encyclopedia
Siderite is also the name of a type of iron meteorite.
Siderite is a mineral composed of iron carbonate FeCO
Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others.
en.wikipedia.org /wiki/Siderite   (203 words)

  
 SIDERITE   (Site not responding. Last check: 2007-10-22)
Siderite is usually a pale yellowish-green when fresh, but the colour is often masked by darker minerals, or by orange-red alteration to hematite, particularly on a weathered rock surface.
Siderite can also occur as a fine or coarse-grained cement within pore spaces; it is fairly soft (4-4.5 on Moh Scale); it may not react with hydrochloric acid, or may bubble very slowly as carbon dioxide is released.
Siderite concretions from Carboniferous floodplain and lacustrine mudstones of northern England, and Jurassic marine ironstones of southern and eastern England were the most important iron ores in the British iron and steel industries from the eighteenth century until the 1970’s.
www.brookes.ac.uk /geology/sedmins/siderite.html   (561 words)

  
 Iconofile Store: Product: Siderite
Siderite is iron carbonate, an important iron ore of a light yellowish brown color, but sometimes also gray, yellowish brown, greenish brown or reddish brown.
Siderite occurs mostly in sedimentary and hydrothermal environments, although it is also found in some igneous pegmatites (a variety of granite occurring in veins).
However, since siderite is closely associated with iron oxide pigments such as goethite (ochre), it may be safe to assume that it has been in use for as long as ochre pigments.
www.iconofile.com /storefront.asp?page=Siderite   (351 words)

  
 EO News: Thick Marine Beds of Siderite Suggest Early High Carbon Dioxide in Atmosphere - May 26, 2004
Carbon dioxide and oxygen, not methane, were prevalent in the Earth’s atmosphere more than 1.8 billion years ago as shown by the absence of siderite in ancient soils but the abundance of the mineral in ocean sediments from that time, according to a Penn State geochemist.
At the same time that siderite is missing from soils, it is abundant in ocean sediments before 1.8 billion years ago and formed thick bands of mineable ores.
The high abundance of siderite in marine sediments and their carbon isotope ratios can be explained only if the carbon dioxide pressure in the atmosphere was more than 100 times, perhaps as much as 1000 times, higher than today’s level.
earthobservatory.nasa.gov /Newsroom/MediaAlerts/2004/2004052617074.html   (575 words)

  
  Siderite, along with calcite and dolomite, is a common carbonate mineral in the overburden associated with Appalachian coal beds (Cecil et al., 1985; Morrison et al., 1990b).
In addition to greater dissolution of siderite, high strengths and volumes of added acid may react with non-carbonate minerals such as secondary silicate clay minerals, resulting in an NP value that is not solely dependent on the carbonate content of the sample (Lapakko, 1994).
Siderite is a common carbonate in many areas, but it is not a neutralizer since it will produce both alkalinity from carbonates and acidity from iron oxidation.
www.wvu.edu /~agexten/landrec/nppapjeq.htm   (7389 words)

  
 Siderite   (Site not responding. Last check: 2007-10-22)
Siderite is a member of the calcite group of carbonates along with rhodochrosite and Smithsonite.
Another example of siderite with quartz comes from Allevard, Isere, France, measuring about 8x8 cm.
A sample from Llallagua, Potosi, Bolivia is siderite with pyrite, measuring about 12x15 cm.
hyperphysics.phy-astr.gsu.edu /hbase/minerals/siderite.html   (171 words)

  
 Siderite: Siderite mineral information and data.
Most often found in bedded sedimentary deposits with a biological component, with shales, clays and coal beds - suggesting that the siderite is biogenically created under low-oxygen and low-Eh conditions.
It is also found in metamorphosed sedimentary rocks as more massively crystalline material, as a gangue mineral in hydrothermal deposits, and in pegmatites, including nepheline syenite pegamtites.
Henderson, E.P. Perry (1958), Studies of seven siderites: Proceedings of the U.S. National Museum: 107: 339-403.
www.mindat.org /min-3647.html   (803 words)

  
 Mineral description : Siderite   (Site not responding. Last check: 2007-10-22)
Siderite is created in hydrothermal environments, in sediments together with organic material or below the oxidising zone in mines.
Reacts with warm hydrochloric acid under release of gas, not as violent as calcite.
The density of siderite separates it from dolomite (2.8-2.9) and ankerite (3.2).
www.geology.neab.net /minerals/siderite.htm   (126 words)

  
 Geochemistry of siderite in the Kuparuk Formation, Alaska: Influence of water/sediment interaction and microbial ...   (Site not responding. Last check: 2007-10-22)
Authigenic siderite is common throughout the formation, either concentrated in distinct layers or as isolated rhombs.
Both the elemental and carbon isotopic compositions of the siderite result from modification of the original marine pore waters during successive stages of microbial decomposition of organic matter.
The oxygen isotopic compositions of the siderite indicate that early pore waters were depleted in 18O, perhaps as a result of water/sediment interaction.
www.ees.nmt.edu /mozley/mozabst/MC92.html   (331 words)

  
 IIC: Searchable index of publications
Siderite was identified by means of XRD, FTIR and SEM-EDS, which showed only minor contents of other minerals in the corrosion scales.
The implications of the formation of siderite as a corrosion product are discussed in terms of its possible passivating properties and thermodynamic stability in situ.
Different mechanisms for the formation of siderite in this environment are proposed, based on the results of environmental monitoring in the area.
www.iiconservation.org /publications/digipubs.php?pub_id=47   (122 words)

  
 Diagenetic Studies, a Key to Reveal the Timing of Oil Migration: an Example from the Tirrawarra Sandstone Reservoir, ...   (Site not responding. Last check: 2007-10-22)
The quantitative elemental compositions of quartz and siderite cements were determined on polished thin sections covered with a thin layer of carbon, using a CAMECA SX 51 electron microprobe at 15 kV, operating with a 20 nA beam current and 0.25-0.5 m beam diameter.
In the Tirrawarra Sandstone, quartz overgrowths and quartz grains are embayed by siderite cement.
The first and second siderite cement generations were each followed by at least one dissolution event related to the tectonic episodes in the study area (Rezaee et al., 1997).
www.fos.ut.ac.ir /text/~journal/rezaee/geology.htm   (7202 words)

  
 [No title]   (Site not responding. Last check: 2007-10-22)
Early cementation of these strata is evident by coexisting calcite and siderite cements that occlude 38 to 40% minus-cement porosity.
Calcite cements are pervasive in the sandstone interbeds, while siderite cements are prevalent in the mudstone interbeds.
Carbon and oxygen isotope (C-O) plot of the siderite cements shows a positive covariant trend which is interpreted to record mixing between meteoric phreatic and marine phreatic pore fluids.
www.igsb.uiowa.edu /pubs/abstract/ncgsa99j.htm   (237 words)

  
 lunarcarbonate
Comparing with the Raman spectra of standard siderite and goethite, the major peak of siderite and goethite (~1084cm-1 and 395cm-1) in studied sample are weak relative to other minor peaks.
A general trend observed is that the siderite grains at the outside of the rock chip have better crystallinity, the siderite identified from the "inner grains" and from the veins have much poor crystallinity, which could be the result of a fast solidification in a much confined space.
The exact Raman peak positions of siderite vary among the spectra taken from the different locations in the same grain or from different grains, which indicates the cation substitutions in these siderites.
epsc.wustl.edu /haskin-group/Raman/lunarcarbonate.htm   (257 words)

  
 Common molecules #50103 - Reciprocal Net   (Site not responding. Last check: 2007-10-22)
Siderite was found by a man named Haidinger in 1845.
Siderite is found in many different places all over the world: the United States, Australia, Germany, Peru, and Greenland to name a few.
Properties of siderite are as follows: it is a carbonate of iron, has a hexagonal crystal structure, has the color grayish-brown when crystals are large, and has the color orange-yellow when crystals are small.
www.reciprocalnet.org /recipnet/showsample.jsp?sampleId=27344721   (155 words)

  
 Experimental determination of siderite stability and application to Martian Meteorite ALH84001 -- Koziol 89 (23): 294 ...
Experimental determination of siderite stability and application to Martian Meteorite ALH84001
The pressure-temperature equilibrium curve of the reaction siderite
of the siderite component of the carbonate, either by a transient
ammin.geoscienceworld.org /cgi/content/abstract/89/2-3/294   (240 words)

  
 Siderite Zackwehdex's Blog
It seems to me that the band is moving away from rock and going towards electro-pop, which would suck, but the songs are still nice.
In order to debug SQL many people open new windows in Query Analyser or Management Studio trying to see where the errors come from and opening transactions and rolling them back and basically be miserable.
I really enjoyed the Warcraft and Starcraft ministories in the game and I was happy to hear that books have been written that take place in those parallel worlds.
siderite.blogspot.com   (2709 words)

  
 Alan Guisewite's Mineral Collection Images: Miscellaneous Systematic Carbonates Page
Tufts of adamsite (a hydrated yttrium sodium rare-earth carbonate) with pink rhodochrosite and aegirine on an albite matrix thumbnail from the type locality for this recently-discovered (1999) mineral of the Poudrette Quarry, Mont St. Hilaire, Rouville County, Québec, Canada.
Complexly-faced siderite crystals with calcite comprise this miniature from Kamsdorf, Saalfeld, Thurigen, Germany.
A spectacular miniature of shimmery light-green siderite plates from the Panasqueira Mine, level 3 (2003), Beira Baixa Province, Castelo Branco District, Portugal.
www.cs.cmu.edu /afs/cs/user/adg/www/adg-pscimages.html   (3295 words)

  
 RESULTS
On the basis of both smear-slide observations and XRD results, siderite occurrence is sporadic between 100 and 120 mbsf.
Below 120 mbsf, disseminated siderite occupies 2-4 wt% of the sediment, or is present as small (<0.5-cm diameter) microcrystalline nodules of siderite occupying up to ~30 wt% (Table 3; Fig.
As with dolomite, petrographic and SEM observations indicate that both disseminated and nodular siderite contains euhedral, microcrystalline rhombs, and is thus authigenic in origin.
www-odp.tamu.edu /publications/164_SR/chap_30/ch30_4.htm   (683 words)

  
 Epimorphs
For some reason the siderite on the back side of most of these has more of a matte luster.
EP-5 Quartz epimorph of Fluorite, with Sphalerite and Siderite - North String, Coalcleugh Mine, West Allendale, Northumberland, England $50; The front (top photo) of this specimen has a very slight rub, which can be seen in the upper center part of the specimen.
The reverse side of this dome shaped example is very sharp, and the matte luster siderite is light enough to revel the great detail of the epimorphs.
www.kcminerals.com /epimorphs.htm   (369 words)

  
 Complex compositional zonation in concretionary siderite: Implications for geochemical studies   (Site not responding. Last check: 2007-10-22)
Siderite concretions are generally thought to be concentrically zoned, with the earliest siderite precipitated at the center and the latest at the outer edge.
Both types are present throughout the concretion body, but the proportions of the two types varies systematically from the center to the outer edge of the concretion.
Such data could be misinterpreted as reflecting a wide variety of siderite compositions, when in fact only two chemically distinct types are present.
www.ees.nmt.edu /mozley/mozabst/M89J.html   (162 words)

  
 Siderite   (Site not responding. Last check: 2007-10-22)
CRYSTAL GROWTH AND HABITS - Siderite commonly forms rhombohedral crystals; it can also be tabular, prismatic or scalenohedral.
Siderite can also be botryoidal or globular, stalactitic or earthy.
OCCURRENCE - Siderite is found as a sedimentary deposit associated with shale or coal.
www.gc.maricopa.edu /earthsci/imagearchive/siderite.htm   (129 words)

  
 MSN Encarta - Search Results - Siderite
Siderite, also chalybite, brown, translucent or transparent mineral with a glassy lustre, composed essentially of iron (ferrous) carbonate, FeCO
Other important ores are goethite, magnetite, siderite, and bog iron (limonite).
Several inorganic carbonates occur in nature and are important minerals or ores; these include calcite (CaCO
uk.encarta.msn.com /Siderite.html   (79 words)

  
 Mineral specimen: Fluorapatite - Mineral specimens Search Results - Fabre Minerals
A crystal of Quartz that is partially coated by Siderite acts as the base for the prisms of doubly-terminated Fluorapatite, which is light lilac and has internal zoning.
This is where there used to be some Siderite (I know this as I removed it).
For me, given the beauty and quality, the fact that there is a contact (this is not damage) due to the former Siderite is acceptable, especially given that it is very difficult to find such specimens at a reasonable price.
www.fabreminerals.com /search_results.php?LANG=EN&MineralSpeciment=Fluorapatite   (1094 words)

  
 SIDERITE-IRON-SILICATE EQUILIBRIA IN PALEOSOLS AS AN ATMOSPHERIC CO2 PALEOBAROMETER OR PALEOPRODUCTIVITY ...   (Site not responding. Last check: 2007-10-22)
A CO paleobarometer based on siderite and iron-silicate equilibrium (Rye et al., 1995, Nature, v.
Earliest Triassic paleosols of Antarctica are berthierine-bearing, but contemporaneous Australian paleosols have both berthierine and siderite.
Siderite-iron-silicate equilibrium is unlikely to be useful for attempts to constrain Precambrian paleoatmospheric conditions using palaeosols unless their biological productivity was unrealistically low.
gsa.confex.com /gsa/2001ESP/finalprogram/abstract_7571.htm   (258 words)

  
 SME--VIRTUAL ATLAS OF OPAQUE AND ORE MINERALS
A vug within a siderite nodule is rimmed by a fine-grained intergrowth of pyrite and marcasite which cannot be distinguished from each other at this magnification.
The matrix is a mosaic of siderite crystals which show faint bireflectance from grey-blue to grey-brown (top left).
A thin zone of coarse-grained carbonate (light grey, centre) shows bireflectance and lies between siderite and limonite (blue-grey, higher reflectance, centre and left), which has replaced the siderite extensively.
www.smenet.org /opaque-ore/Plate48.htm   (483 words)

  
 Investigation of the High-Temperature Behavior of Excluded Siderite Grains during Pulverized Fuel Combustion   (Site not responding. Last check: 2007-10-22)
An investigation of the behavior of excluded siderite samples derived from both pure mineral species and by density separation of pulverized coal samples was conducted at combustion temperatures of 1100 and 1600
Analysis of quenched combustion residues collected from the combustion gases under oxidizing conditions was obtained via scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray fluorescence (XRF) spectroscopy.
The FeO-MgO-CaO ternary phase diagram was used to predict the behavior of excluded siderite grains under combustion conditions and indicated that the siderite is unlikely to form sticky or completely melted particles at 1600
pubs.acs.org /cgi-bin/abstract.cgi/enfuem/1998/12/i03/abs/ef970107g.html   (243 words)

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