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definitions - Siderite

siderite (n.)

1.a meteorite consisting principally of nickel and iron

2.iron ore in the form of ferrous carbonate

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Merriam Webster

SideriteSid"er*ite, n. [L. sideritis loadstone, Gr. ����, ����, of iron, from ���� iron.]
1. (Min.) (a) Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron. (b) A meteorite consisting solely of metallic iron. (c) An indigo-blue variety of quartz. (d) Formerly, magnetic iron ore, or loadstone.

2. (Bot.) Any plant of the genus Sideritis; ironwort.

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definition (more)

definition of Wikipedia

synonyms - Siderite

siderite (n.)

chalybite

analogical dictionary

 

meteor; meteorite[ClasseHyper.]

astronomy[Domaine]

Meteorite[Domaine]

meteor, meteoroid[Hyper.]

meteoritic, meteoritical[Dérivé]

meteorite[Hyper.]

siderite (n.)


 

salt[Classe]

geology[Domaine]

Mineral[Domaine]

ore[Hyper.]

iron ore[Hyper.]

siderite (n.)


Wikipedia

Siderite

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

Siderite from Brasil
General
Category Carbonate mineral
Chemical formula FeCO3
Strunz classification 05.AB.05
Dana classification 14.01.01.03
Identification
Color Pale yellow to tannish, grey, brown, green, red, black and sometimes nearly colorless
Crystal habit Tabular crystals, often curved - botryoidal to massive
Crystal system Trigonal - Hexagonal scalenohedral (3 2/m)
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 is a mineral composed of iron 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. Both magnesium and manganese commonly substitute for the iron.

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.

Its crystals belong to the hexagonal 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 (sometimes called manganosiderite).

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. 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.[4] 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.[5]

  References

  1. ^ http://rruff.geo.arizona.edu/doclib/hom/siderite.pdf Handbook of Mineralogy
  2. ^ http://www.mindat.org/min-3647.html Mindat
  3. ^ http://www.webmineral.com/data/Siderite.shtml Webmineral data
  4. ^ *Mozley, P.S., 1989, Relation between depositional environment and the elemental composition of early diagenetic siderite: Geology, v. 17, p. 704- 706
  5. ^ *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
  • The Complete Book of Science, American Education Publishing, Columbus, Ohio 2005
   
               

 

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