Magnesium carbonate

Magnesium carbonate
Names
	Other names Magnesite; Barringtonite (dihydrate); Nesequehonite (trihydrate); Lansfordite (pentahydrate)
Identifiers
CAS Number	546-93-0 (anhydrous) ; 17968-26-2 (monohydrate) ; 5145-48-2 (dihydrate) ; 14457-83-1 (trihydrate) ; 61042-72-6 (pentahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:31793 ;
ChEMBL	ChEMBL1200736 ;
ChemSpider	10563 ;
ECHA InfoCard	100.008.106
E number	E504(i) (acidity regulators, ...)
PubChem CID	11029;
RTECS number	OM2470000;
UNII	0IHC698356 ; 0E53J927NA (monohydrate) ;
CompTox Dashboard (EPA)	DTXSID4049660 ;
	InChI InChI=1S/CH2O3.Mg/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: ZLNQQNXFFQJAID-UHFFFAOYSA-L ; InChI=1/CH2O3.Mg/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: ZLNQQNXFFQJAID-NUQVWONBAU;
	SMILES [Mg+2].[O-]C([O-])=O;
Properties
Chemical formula	MgCO3
Molar mass	84.3139 g/mol (anhydrous)
Appearance	Colourless crystals or white solid; Hygroscopic
Odor	Odorless
Density	2.958 g/cm3 (anhydrous) ; 2.825 g/cm3 (dihydrate) ; 1.837 g/cm3 (trihydrate) ; 1.73 g/cm3 (pentahydrate)
Melting point	350 °C (662 °F; 623 K) ; decomposes (anhydrous); 165 °C (329 °F; 438 K); (trihydrate)
Solubility in water	Anhydrous:; 0.0139 g/100 ml (25 °C); 0.0063 g/100 ml (100 °C)
Solubility product (Ksp)	10−7.8
Solubility	Soluble in acid, aqueous CO2 ; Insoluble in acetone, ammonia
Magnetic susceptibility (χ)	−32.4·10−6 cm3/mol
Refractive index (nD)	1.717 (anhydrous); 1.458 (dihydrate); 1.412 (trihydrate)
Structure
Crystal structure	Trigonal
Space group	R3c, No. 167
Thermochemistry
Heat capacity (C)	75.6 J/mol·K
Std molar; entropy (S⦵298)	65.7 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−1113 kJ/mol
Gibbs free energy (ΔfG⦵)	−1029.3 kJ/mol
Pharmacology
ATC code	A02AA01 (WHO) A06AD01 (WHO)
Hazards
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m3 (total); TWA 5 mg/m3 (resp);
Safety data sheet (SDS)	ICSC 0969
Related compounds
Other anions	Magnesium bicarbonate
Other cations	Beryllium carbonate; Calcium carbonate; Strontium carbonate; Barium carbonate; Radium carbonate
Related compounds	Artinite; Hydromagnesite; Dypingite
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Magnesium carbonate, Mg CO₃ (archaic name magnesia alba), is an inorganic salt that is a colourless or white solid. Several hydrated and basic forms of magnesium carbonate also exist as minerals.

Names



Other names Magnesite Barringtonite (dihydrate) Nesequehonite (trihydrate) Lansfordite (pentahydrate)
Identifiers
CAS Number	546-93-0 (anhydrous)^Y 17968-26-2 (monohydrate)^Y 5145-48-2 (dihydrate)^N 14457-83-1 (trihydrate)^N 61042-72-6 (pentahydrate)^N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:31793^Y
ChEMBL	ChEMBL1200736^N
ChemSpider	10563^Y
ECHA InfoCard	100.008.106
E number	E504(i) (acidity regulators, ...)
PubChem CID	11029
RTECS number	OM2470000
UNII	0IHC698356^Y 0E53J927NA (monohydrate)^Y
CompTox Dashboard (EPA)	DTXSID4049660
InChI InChI=1S/CH2O3.Mg/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2^Y Key: ZLNQQNXFFQJAID-UHFFFAOYSA-L^Y InChI=1/CH2O3.Mg/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: ZLNQQNXFFQJAID-NUQVWONBAU
SMILES [Mg+2].[O-]C([O-])=O
Properties
Chemical formula	MgCO₃
Molar mass	84.3139 g/mol (anhydrous)
Appearance	Colourless crystals or white solid Hygroscopic
Odor	Odorless
Density	2.958 g/cm³ (anhydrous) 2.825 g/cm³ (dihydrate) 1.837 g/cm³ (trihydrate) 1.73 g/cm³ (pentahydrate)
Melting point	350 °C (662 °F; 623 K) decomposes (anhydrous) 165 °C (329 °F; 438 K) (trihydrate)
Solubility in water	Anhydrous: 0.0139 g/100 ml (25 °C) 0.0063 g/100 ml (100 °C)
Solubility product (K_sp)	10^−7.8
Solubility	Soluble in acid, aqueous CO₂ Insoluble in acetone, ammonia
Magnetic susceptibility (χ)	−32.4·10⁻⁶ cm³/mol
Refractive index (n_D)	1.717 (anhydrous) 1.458 (dihydrate) 1.412 (trihydrate)
Structure
Crystal structure	Trigonal
Space group	R3c, No. 167
Thermochemistry
Heat capacity (C)	75.6 J/mol·K
Std molar entropy (S^⦵₂₉₈)	65.7 J/mol·K
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−1113 kJ/mol
Gibbs free energy (Δ_fG^⦵)	−1029.3 kJ/mol
Pharmacology
ATC code	A02AA01 (WHO) A06AD01 (WHO)
Hazards
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m³ (total) TWA 5 mg/m³ (resp)
Safety data sheet (SDS)	ICSC 0969
Related compounds
Other anions	Magnesium bicarbonate
Other cations	Beryllium carbonate Calcium carbonate Strontium carbonate Barium carbonate Radium carbonate
Related compounds	Artinite Hydromagnesite Dypingite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references