Siderite


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Related to Siderite: pyrite

siderite

(sĭd`ərīt) or

chalybite

(kăl`ĭbīt), a mineral, varying in color from brown, green, or gray to black and occurring in nature in massive and crystalline form. A carbonate of iron, FeCO3, it serves as an iron ore, especially in the British Isles. It is widely distributed, being found also in the United States, Europe, South America, and Australia.

Siderite

 

(also spathic iron, chalybite), a mineral, a carbonate of iron with the composition Fe[CO3]. Siderite contains 62.01 percent FeO and 37.99 percent CO2. Its composition often includes isomorphic admixtures of Mn and Mg, which replace iron; more rarely, Ca is present, as are Co and Zn. Siderite cystallizes in the trigonal system, forming rhombohedral, tabular, prismatic, or scalenohedral crystals; the last occur rarely. The mineral usually occurs as granular aggregates, sinters, concretions, spherulites, and earthy agglomerates; it forms deposits in the form of veins, strata, and irregularly shaped bodies. Siderite is yellowish white, gray or greenish gray and turns brown upon weathering. It has a hardness of 4.5 on Mohs’ scale and a density of 3,960 kg/m3.

Depending on the conditions of formation, siderite is classified as being of hydrothermal, sedimentary (infiltration and precipitation), or metamorphosed origin. During weathering and oxidation, siderite is usually converted into hydrogoethite or hydrohematite. Siderite is one of the most important minerals in iron ore.


Siderite

 

any of the iron class of meteorites, according to modern classification. Formerly, the designation “siderite” was applied to iron meteorites that consist almost wholly of nickel-iron.

siderite

[′sid·ə‚rīt]
(mineralogy)
FeCO3 A brownish, gray, or greenish rhombohedral mineral composed of ferrous carbonate; hardness is 4 on Mohs scale, and specific gravity is 3.9. Also known as chalybite; iron spar; rhombohedral iron ore; siderose; sparry iron; spathic iron; white iron ore.
References in periodicals archive ?
Postma D (1980) Formation of siderite and vivianite and the pore-water composition of a recent bog sediment in Denmark.
Also, the southern deposits are more polymetallic in composition, including such minerals as galena, sphalerite, pyrite, siderite, chalcopyrite, marcasite, bornite, and quartz.
(a) Q: quartz (high); K: kaolinite (high); I: illite; I/M: illite-montmorillonite mixed layer; Cl: Chlorite; S: Smectite; D: dolomite (low); P: pyrite; L: siderite; C: calcite (low); F: feldspar; non: amorphous materials; O: others (low).
They dealt with the influence of temperature on the dielectric properties of Pyrite, Galena, Chalcopyrite, Magnesite, Siderite, and Andesite, taken from different parts of the Slovak Republic.
(2014) demonstrated the presence of rod-shaped bacteria embedded in the surface of siderite nanocrystals in samples from Rio Tinto (Spain).
The dolomitic-marble rocks appear white (fresh) to yellowish-brown (altered) in color due to the absence or presence of siderite, respectively (Figure 4(b)).
substituted by a variety of elements, this leads to the formation of many different calcite isotypes; Ca (calcite), Cd (otavite), Co,Zn (smithsonite), Fe (siderite), Mg (magnesite), Mn(rhodochrosite) etc.
Carbonates, containing Siderite mineral (FeCO3 with iron ore content of 30 %.
Gangue species in the manganese veins most commonly included barite, calcite and quartz; rarely, aragonite and siderite occur; extremely rarely (and only in Silberbachtal), rhodochrosite was found.
[34] found that the amount of Cr(VI) reduced per gram of siderite (at equilibrium) has increased with the increase in the initial Cr(VI) concentration at the same acid concentration.
The same increase in carbonate-bound Cd was also reported by Mortimer and Rae (2000), who attributed it to the reprecipitation of Cd onto FeC[O.sub.3] (siderite) surfaces.