Iron(II) carbonate

iron(II) carbonate
Names
	Other names ferrous carbonate
Identifiers
CAS Number	563-71-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	10774 ;
ECHA InfoCard	100.008.418
E number	E505 (acidity regulators, ...)
PubChem CID	11248;
UNII	MZ3Q72U52O ;
CompTox Dashboard (EPA)	DTXSID8052225 ;
	InChI InChI=1S/CH2O3.Fe/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: RAQDACVRFCEPDA-UHFFFAOYSA-L;
	SMILES C(=O)([O-])[O-].[Fe+2];
Properties
Chemical formula	FeCO3
Molar mass	115.854 g/mol
Appearance	white powder or crystals
Density	3.9 g/cm3
Melting point	decomposes
Solubility in water	0.0067 g/L; Ksp = 1.28 × 10−11
Solubility product (Ksp)	3.13×10−11
Magnetic susceptibility (χ)	+11,300·10−6 cm3/mol
Structure
Crystal structure	Hexagonal scalenohedral / Trigonal (32/m) ; Space group: R 3c, a = 4.6916 Å, c = 15.3796 Å
Coordination geometry	6
Related compounds
Other anions	iron(II) sulfate
Other cations	copper(II) carbonate, zinc carbonate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iron(II) carbonate, or ferrous carbonate, is a chemical compound with formula FeCO
₃, that occurs naturally as the mineral siderite. At ordinary ambient temperatures, it is a green-brown ionic solid consisting of iron(II) cations Fe²⁺
and carbonate anions CO²⁻
₃. The compound crystallizes in the same motif as calcium carbonate. In this motif, the carbonate dianion is nearly planar. Its three oxygen atoms each bind to two Fe(II) centers, such that the Fe has an octahedral coordination geometry.