Many translated example sentences containing "sidérite" – English-French dictionary and search engine for English translations.

The color of siderite varies from yellow, brown, red, green, and gray. It belongs to the calcite group and is a form of carbonate. On the Mohs scale of hardness, siderite is at 3.5 to 4.5. Its chemical composition is FeCO3. …

Siderite is found in a wide variety of hydrothermal, metasomatic and sedimentary settings. It is a common mineral in sedimentary iron deposits or in …

Siderite is a mineral that is characterized by a pearly or vitreous luster and white streak with a specific gravity equivalent to 3.96, and 3.75 to 4.25 Mohs hardness. Siderite is the major byproduct of corrosion that signifies corrosion caused by carbon dioxide. Most materials made from steel are prone to CO 2 corrosion when CO 2 partial ...

USES. Siderite is an ore of iron in some iron deposits. NOTEWORTHY LOCALITIES. Siderite is a common mineral and is found worldwide in many different environment s. Only the most noteworthy will be mentioned here. Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains, Germany; and Panasqueira, Portugal.

siderite, also called chalybite, iron carbonate (FeCO 3), a widespread mineral that is an ore of iron. The mineral commonly occurs in thin beds with shales, clay, or coal seams (as …

Siderite forms three solid-state solution series. It's the iron (Fe) analogue in a series with manganese (Mn) dominant rhodochrosite. It also forms the Fe-end of a series with zinc (Zn) dominant smithsonite, as well as with …

Many translated example sentences containing "siderite" – French-English dictionary and search engine for French translations.

The Fe (2p3/2)/Fe (2p1/2) spectra (Fig. 5a) of siderite and siderite-HA can be seen at 709.1/722.5 eV and 710.2/723.3 eV, respectively, which indicated that the precipitates of the siderite after ...

9.05.5.5 Carbonate Minerals. Like the precipitation of secondary Al (OH) 3, that of secondary siderite [FeCO3] is widely employed in geochemical models. Secondary siderite and associated iron oxyhydroxides were determined to have formed as coatings, up to 1,000 μm thick, on ankerite-dolomite in the Kidd Creek tailings impoundment at Timmins ...

isotopes de l'oxygene et processus de formation de siderite author timofeeva zv; kuznetsova ld; dontsova ei inst. geokhim. anal. khim. akad. nauk sssr, moskva ... statistical distribution o-18/o-16 c-13 siderite syngenesis diagenesis cementation deposits metasomatism o-18 isotope geochemistry geology earth sciences keyword (es)

Siderite can be very rarely transparent but most samples are translucent or opaque. Cleavage is perfect {0111}; luster ranges from vitreous to pearly. Fracture is conchoidal to uneven. Siderite streak is …

A large number of siderites have been found in the Lopingian (Late Permian) coal-bearing series in western Guizhou, which occurs in various microscopic morphologies and has potential insights into the sedimentary and diagenetic environments. An integrated set of analyses, such as microscopic observation; X-ray diffraction; whole-rock major and …

Siderite is some shade of brown or brownish yellow. It is more dense (3.96) than other common carbonates because of iron content. It occurs as an earthy mass or as concretionary nodules (clay ironstone) in iron-rich …

General Siderite Information : Chemical Formula: Fe++CO3 : Composition: Molecular Weight = 115.86 gm Iron 48.20 % Fe 62.01 % FeO Carbon ... 7 - Ecole des Mines de Paris 8 - Franklin Minerals(Dunn) 9 - Franklin Minerals(Palache) 10 - GeoScienceWorld 11 - Glendale Community College 12 - Google Images

La sidérite est une espèce minérale composée de carbonate de fer de formule brute FeCO3 avec des traces de Mg ; Mn ; Ca ; Co ; Zn. Rarement pure, la sidérite contient souvent du magnésium et du manganèse et forme une solution solide continue avec la magnésite et la …

Les sidérites proviendraient du coeur en fer-nickel de ces astéroïdes, suffisamment gros pour qu'un processus de Différentiation conduise à une structure similaire à la Terre avec un manteau et un Noyau . ... pratiquement homogène, en sidérite, d'une densité de 3000kg/m3. Sa période est de 2 ans, avec un demi grand axe de a ...

Ces souches bactériennes sont capables de transformer la sidérite et la magnétite par des processus microbiens directs ou indirects et de conduire à la …

1 Siderite nucleation pathways as a function of aqueous solution saturation state at 25 oC Josephina J.P.A. Muldersa, Dominique J. Toblerb & Eric H. Oelkersa,c* aEarth …

In this study, three stages of the possible pathway by which HA causes mineral transformation from siderite to goethite are identified. Firstly, a Fe (II)-HA …

The Mazon Creek fossils occur in siderite (ironstone, FeCO 3) concretions in the Francis Creek Shale Member of the Carbondale Formation, of Westphalian D age (306 Ma).The Francis Creek Shale overlies the Colchester N° 2 Coal Member, and is itself overlain by the Mecca Quarry Shale Member (137, 138).The Colchester Coal is generally about 1 m (c. …

Sidérite : qu'est-ce que c'est ? Univers. ... suffisamment gros pour qu'un processus de différentiation différentiation conduise à une structure similaire à la Terre Terre avec un manteau ...

siderite, also called chalybite, iron carbonate (FeCO3), a widespread mineral that is an ore of iron. The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in …

la disparition d'une grande partie du ciment verdâtre de sidérite et de berthiérine (Fig. 2b) ; l'analyse chimique des boues prélevées sur le sol de vieilles galeries – notamment leur richesse en Fe, ... Ce processus est favorisé par la présence de bactéries. À cet égard, les échantillons récemment prélevés en fond de mine ...

HISTORY, NAME, LOCALITIES: Siderite, pronounced SYE-der-ite, has been known since antiquity and was recognized as mineral species in 1845. Its name stems from the Greek sideros, meaning "iron," alluding to its …

Les sidérites sont des météorites métalliques constituées principalement de fer et provenant très probablement d' astéroïdes de quelques centaines de kilomètres de …

Abstract. The mechanisms of siderite (FeCO3) nucleation from aqueous solution depend on the fluid saturation state. In this study we investigate the effect of …

Définition et Explications - La sidérite est une espèce minérale composé de carbonate de fer de formule brute FeCO3 avec des traces de Mn;Mg;Ca;Zn;Co. Rarement pure, la …

Siderite is paramagnetic at ordinary temperatures and carries no NRM. Its interest is as a source of diagenetic magnetite. On Earth, the oxidation of siderite at room temperature …

Fig. 1 illustrates the mineralogical characteristics of siderite ore. It can be seen that the siderite was the dominate mineral in the raw ore. The calcium and magnesium existed in dolomite (CaMg(CO 3) 2) and ankerite (Ca(Mg,Fe) (CO 3) 2) particles with size of 100–300 microns.The distribution of potassium and aluminum were consisted with the …