Siderite

From Wikipedia, the free encyclopedia
  (Redirected from Ferrous carbonate)
Jump to: navigation, search
Siderite is also the name of a type of iron meteorite.
Siderite
SideriteBresil2.jpg
Siderite from Brasil
General
Category Carbonate mineral
Formula
(repeating unit)
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(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. 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[edit]

  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

External links[edit]

H2CO3 He
LiCO3 BeCO3 B C (NH4)2CO3,
NH4HCO3
O F Ne
Na2CO3,
NaHCO3,
Na3H(CO3)2
MgCO3,
Mg(HCO3)2
Al2(CO3)3 Si P S Cl Ar
K2CO3,
KHCO3
CaCO3,
Ca(HCO3)2
Sc Ti V Cr MnCO3 FeCO3 CoCO3 NiCO3 CuCO3 ZnCO3 Ga Ge As Se Br Kr
Rb2CO3 SrCO3 Y Zr Nb Mo Tc Ru Rh Pd Ag2CO3 CdCO3 In Sn Sb Te I Xe
Cs2CO3,
CsHCO3
BaCO3   Hf Ta W Re Os Ir Pt Au Hg Tl2CO3 PbCO3 (BiO)2CO3 Po At Rn
Fr Ra   Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Fl Uup Lv Uus Uuo
La2(CO3)3 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Ac Th Pa UO2CO3 Np Pu Am Cm Bk Cf Es Fm Md No Lr