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Calcium carbonate
Names
	IUPAC name Calcium carbonate
	Other names calcite; aragonite; chalk; Lime (material); Limestone; marble; oyster; pearl;
Identifiers
CAS Number	471-34-1 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:3311 ;
ChEMBL	ChEMBL1200539 ;
ChemSpider	9708 ;
DrugBank	DB06724;
EC Number	207-439-9;
KEGG	D00932 ;
PubChem CID	10112;
RTECS number	FF9335000;
UNII	H0G9379FGK ;
	InChI InChI=1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: VTYYLEPIZMXCLO-UHFFFAOYSA-L ; InChI=1/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: VTYYLEPIZMXCLO-NUQVWONBAS;
	SMILES [Ca+2].[O-]C([O-])=O; C(=O)([O-])[O-].[Ca+2];
Properties
Chemical formula	CaCO3
Molar mass	100.0869 g/mol
Appearance	Fine white powder; chalky taste
Odor	odorless
Density	2.711 g/cm3 (calcite); 2.83 g/cm3 (aragonite)
Melting point	١٬٣٣٩ °C (٢٬٤٤٢ °F؛ ١٬٦١٢ K) (calcite) ; ٨٢٥ degrees Celsius (١٬٥١٧ degrees Fahrenheit؛ ١٬٠٩٨ kelvin) (aragonite)
Boiling point	decomposes
Solubility in water	0.013 g/L (25 °C)
Solubility product (Ksp)	3.3×10−9
Solubility in dilute acids	soluble
Acidity (pKa)	9.0
Magnetic susceptibility (χ)	−3.82×10−5 cm3/mol
Refractive index (nD)	1.59
Structure
Crystal structure	Trigonal
Space group	32/m
Thermochemistry
Std molar; entropy (So298)	93 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−1207 kJ·mol−1
Pharmacology
ATC code	A02AC01 (WHO) A12AA04 (WHO)
Hazards
Safety data sheet	ICSC 1193
NFPA 704 (fire diamond)	0 0 0
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	6450 mg/kg (oral, rat)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
Related compounds
Other anions	Calcium bicarbonate
Other cations	Magnesium carbonate; Strontium carbonate; Barium carbonate
Related compounds	Calcium sulfate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

^ Aylward, Gordon; Findlay, Tristan (2008). SI Chemical Data Book (4th ed.). John Wiley & Sons Australia. ISBN 978-0-470-81638-7.
^ Rohleder, J.; Kroker, E. (2001). Calcium Carbonate: From the Cretaceous Period Into the 21st Century. Springer Science & Business Media. ISBN 978-3-7643-6425-0.
^ Benjamin, Mark M. (2002). Water Chemistry. McGraw-Hill. ISBN 978-0-07-238390-4.
^ "Occupational safety and health guideline for calcium carbonate" (PDF). US Dept. of Health and Human Services. Retrieved 31 March 2011.
^ "Archived copy" (PDF). Archived from the original (PDF) on 29 October 2018. Retrieved 29 October 2018.{{cite web}}: CS1 maint: archived copy as title (link)
^ ^ئ ^ا Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 978-0-618-94690-7.
^ NIOSH Pocket Guide to Chemical Hazards. "#0090". National Institute for Occupational Safety and Health (NIOSH).

[1] Aylward, Gordon; Findlay, Tristan (2008). SI Chemical Data Book (4th ed.). John Wiley & Sons Australia. ISBN 978-0-470-81638-7.

[2] Rohleder, J.; Kroker, E. (2001). Calcium Carbonate: From the Cretaceous Period Into the 21st Century. Springer Science & Business Media. ISBN 978-3-7643-6425-0.

[3] Benjamin, Mark M. (2002). Water Chemistry. McGraw-Hill. ISBN 978-0-07-238390-4.

[4] "Occupational safety and health guideline for calcium carbonate" (PDF). US Dept. of Health and Human Services. Retrieved 31 March 2011.

[5] "Archived copy" (PDF). Archived from the original (PDF) on 29 October 2018. Retrieved 29 October 2018.{{cite web}}: CS1 maint: archived copy as title (link)

[b1-6] ئ ^ا Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 978-0-618-94690-7.

[7] NIOSH Pocket Guide to Chemical Hazards. "#0090". National Institute for Occupational Safety and Health (NIOSH).

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