Siderite

Siderite is a mineral composed of iron(II) carbonate (FeCO₃). It takes its name from the Greek word σίδηρος sideros, "iron". It is a valuable iron mineral, since it is 48% iron and contains no sulfur or phosphorus. Zinc, magnesium and manganese commonly substitute for the iron resulting in the siderite-smithsonite, siderite-magnesite and siderite-rhodochrosite solid solution series.[2]

Siderite is also the name of a type of iron meteorite.

Siderite
General
Category	Carbonate mineral
Formula (repeating unit)	FeCO3
Strunz classification	5.AB.05
Dana classification	14.01.01.03
Crystal system	Trigonal
Crystal class	Hexagonal scalenohedral (3m) H-M symbol: (3 2/m)
Space group	R3c
Unit cell	a = 4.6916, c = 15.3796 [Å]; Z = 6
Identification
Color	Pale yellow to tannish, grey, brown, green, red, black and sometimes nearly colorless
Crystal habit	Tabular crystals, often curved - botryoidal to massive
Twinning	Lamellar uncommon on{0112}
Cleavage	Perfect on {0111}
Fracture	Uneven to conchoidal
Tenacity	Brittle
Mohs scale hardness	3.75 - 4.25
Luster	Vitreous, may be silky to pearly
Streak	White
Diaphaneity	Translucent to subtranslucent
Specific gravity	3.96
Optical properties	Uniaxial (-)
Refractive index	nω = 1.875 nε = 1.633
Birefringence	δ = 0.242
Dispersion	Strong
References	[1][2][3]

Siderite has Mohs hardness of 3.75-4.25, a specific gravity of 3.96, a white streak and a vitreous lustre or pearly luster. Siderite is antiferromagnetic below its Néel temperature of 37 K which can assist in its identification.[4]

It crystallizes in the trigonal crystal system, and are rhombohedral in shape, typically with curved and striated faces. It also occurs in masses. Color ranges from yellow to dark brown or black, the latter being due to the presence of manganese.

Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It is also a common diagenetic mineral in shales and sandstones, where it sometimes forms concretions, which can encase three-dimensionally preserved fossils.[5] In sedimentary rocks, siderite commonly forms at shallow burial depths and its elemental composition is often related to the depositional environment of the enclosing sediments.[6] In addition, a number of recent studies have used the oxygen isotopic composition of sphaerosiderite (a type associated with soils) as a proxy for the isotopic composition of meteoric water shortly after deposition.[7]

Spathic iron ore

Although spathic (carbonate) iron ores, such as siderite, have been economically important for steel production, they are far from ideal as an ore.

Their hydrothermal mineralisation tends to form them as small ore lenses, often following steeply dipping bedding planes.[lower-roman 1] This makes them not amenable to opencast working, and increases the cost of working them by mining with horizontal stopes.[9] As the individual ore bodies are small, it may also be necessary to duplicate or relocate the pit head machinery, winding engine and pumping engine, between these bodies as each is worked out. This makes mining the ore an expensive proposition compared to typical ironstone or haematite opencasts.[lower-roman 2]

The recovered ore also has drawbacks. The carbonate ore is more difficult to smelt than a haematite or other oxide ore. Driving off the carbonate as carbon dioxide requires more energy and so the ore 'kills' the blast furnace if added directly. Instead the ore must be given a preliminary roasting step. Developments of specific techniques to deal with these ores began in the early 19th century, largely with the work of Sir Thomas Lethbridge in Somerset.[11] His 'Iron Mill' of 1838 used a three-chambered concentric roasting furnace, before passing the ore to a separate reducing furnace for smelting. Details of this Mill were the invention of Charles Sanderson, a steel maker of Sheffield, who held the patent for it.[12]

These differences between spathic ore and haematite have led to the failure of a number of mining concerns, notably the Brendon Hills Iron Ore Company.[13]

Spathic iron ores are rich in manganese and have negligible phosphorus. This led to their one major benefit, connected with the Bessemer steel-making process. Although the first demonstrations by Bessemer in 1856 had been successful, later attempts to reproduce this were infamously failures.[14] Work by the metallurgist Robert Forester Mushet discovered that the reason for this was the nature of the Swedish ores that Bessemer had innocently used, being very low in phosphorus. Using a typical European high-phosphorus ore in Bessemer's converter gave a poor quality steel. To produce high quality steel from a high-phosphorus ore, Mushet realised that he could operate the Bessemer converter for longer, burning off all the steel's impurities including the unwanted phosphorus and the essential carbon, but then re-adding carbon, with manganese, in the form of a previously obscure ferromanganese ore with no phosphorus, spiegeleisen.[14] This created a sudden demand for spiegeleisen. Although it was not available in sufficient quantity as a mineral, steelworks such as that at Ebbw Vale in South Wales soon learned to make it from the spathic siderite ores.[15] For a few decades, spathic ores were now in demand and this encouraged their mining. In time though, the original 'acidic' liner, made from siliceous sandstone or ganister, of the Bessemer converter was replaced by a 'basic' liner in the developed Gilchrist Thomas process. This removed the phosphorus impurities as slag, produced by chemical reaction with the liner, and no longer required spiegeleisen. From the 1880s demand for the ores fell once again and many of their mines, including those of the Brendon Hills, closed soon after.

Gallery

• 
  Siderite - Redruth, Cornwall, England
• 
  Siderite crystals with galena and quartz (size: 6.2 x 4.1 x 3.6 cm)
• 
  Disc-shaped, brown siderite crystals perched upon chalcopyrites
• 
  Cut siderite from Minas Gerais, Brazil (size : 5 x 3.2 mm)
• 
  Colorado siderite, with sharp blades of olive-brown and minor accenting quartz
• 
  Fossiliferous siderite concretion from the Lower Carboniferous.

Notes

1. Some siderite, along with goethite, also forms in bog iron deposits,[8] but these are small and economically minor.
2. Both ironstones and banded iron formations are sedimentary formations, thus the economically viable deposits may be considerable thicker and more extensive.[10]

References

1. Handbook of Mineralogy
2. Mindat
3. Webmineral data
4. Frederichs, T.; von Dobeneck, T.; Bleil, U.; Dekkers, M.J. (January 2003). "Towards the identification of siderite, rhodochrosite, and vivianite in sediments by their low-temperature magnetic properties". Physics and Chemistry of the Earth, Parts A/B/C. 28 (16–19): 669–679. doi:10.1016/S1474-7065(03)00121-9.
5. Russell Garwood, Jason A. Dunlop & Mark D. Sutton (2009). "High-fidelity X-ray micro-tomography reconstruction of siderite-hosted Carboniferous arachnids". Biology Letters. 5 (6): 841–844. doi:10.1098/rsbl.2009.0464. PMC 2828000. PMID 19656861.
6. Mozley, P.S., 1989, Relation between depositional environment and the elemental composition of early diagenetic siderite: Geology, v. 17, p. 704- 706
7. Ludvigson, G.A., Gonzalez, L.A. Metzger, R.A., Witzke, B.J., Brenner, R.L., Murillo, A.P.and White, T.S., 1998, Meteoric sphaerosiderite lines and their use for paleohydrology and paleoclimatology: Geology, v. 26, p. 1039-1042
8. Sedimentary Geology, p. 304.
9. Jones (2011), p. 34–35,37.
10. Prothero, Donald R.; Schwab, Fred (1996). Sedimentary Geology. New York: W.H. Freeman and Company. pp. 300–302. ISBN 0-7167-2726-9.
11. Jones, M.H. (2011). The Brendon Hills Iron Mines and the West Somerset Mineral Railway. Lightmoor Press. pp. 17–22. ISBN 9781899889-5-3-2.CS1 maint: ref=harv (link)
12. GB 7828, Charles Sanderson, "Smelting Iron Ores", issued October 1838
13. Jones (2011), p. 99.
14. Jones (2011), p. 16.
15. Jones (2011), p. 158.