Structure of Calcium carbonate (CAS NO.471-34-1):

Molecular Formula: CaCO₃
Molecular Weight: 100.087 g/mol 
EINECS: 207-439-9 
Flash Point: 169.8 °C
Enthalpy of Vaporization: 63.37 kJ/mol
Boiling Point: 333.6 °C at 760 mmHg
Density: 2.93 g/mL at 25 °C(lit.)
Vapour Pressure: 0.00856 mmHg at 25 °C
Melting point: 825 °C
Storage tempreture: Store at RT.
Water solubility: Insoluble
Solubility: 5 M HCl: 0.1 M at 20 °C, clear, colorless
Appearance: White powder
IUPAC Name: Calcium carbonate
Product Category of Calcium carbonate (CAS NO.471-34-1): Inorganics;Pharmacopoeial Organics;Application CRMs;Titrimetry CRMs;TitrimetryAnalytical Standards;Calcium Salts;Metal and Ceramic Science;Chemical Synthesis;Analytical Reagents for General Use;Calcium Salts;Essential Chemicals;Routine Reagents;API's

 Calcium carbonate (CAS NO.471-34-1) is one of several important inorganic chemicals and is widely used in both its pure and its impure states. As marble chips, it is sold in many sizes as a filler for artificial stone, for the neutralization of acids, and for chicken grit. It is used to produce viscous solutions or dispersions, to impart body, improve consistency, or stabilize emulsions, including suspending and bodying agents, setting agents, jellying agents, bulking agents, stabilizers and thickeners.

Most of Calcium carbonate (CAS NO.471-34-1) used in industry is extracted by mining or quarrying. Pure calcium carbonate can be produced from a pure quarried source (usually marble). Calcium oxide is prepared by calcining crude calcium carbonate.

Hazard Codes: Xi
Risk Statements: 37/38-41-36/38-36
37/38: Irritating to respiratory system and skin 
41: Risk of serious damage to eyes 
36/38: Irritating to eyes and skin 
36: Irritating to the eyes
Safety Statements: 26-36/37/39-37/39
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36/37/39: Wear suitable protective clothing, gloves and eye/face protection 
37/39: Wear suitable gloves and eye/face protection

OSHA PEL: Total Dust: 15 mg/m³; Respirable Fraction: 5 mg/m³
ACGIH TLV: TWA (nuisance particulate) 10 mg/m³ of total dust (when toxic impurities are not present, e.g., quartz <1%)

 Calcium carbonate , its cas register number is 471-34-1. It also can be called Carbonic acid calcium salt ; Marble ; and Limestone .