Calcium Carbonate, Calcite (CaCO 3 )

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Calcium Carbonate, Calcite (CaCO₃)
Categories:	Ceramic
Material Notes:	CAS Number: 471-34-1 Physical Form: White Hexagonal Crystals or Powder Natural Occurrence: Limestones, dolomites, marbles. Solubility of all carbonates rises rapidly with increasing P_CO2 in industrial and urban atmospheres at low temperatures. Property values are typical of naturally occurring Calcite (CaCO₃). Actual property values will vary from sample to sample.
Key Words:	Calcite (CaCO3)
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Physical Properties	Metric	English	Comments

Density	2.72 - 2.81 g/cc	0.0983 - 0.102 lb/in³
Solubility	40 - 85 ppm	40 - 85 ppm	Freshwater
	66 ppm	66 ppm	Seawater
Molecular Weight	100.087 g/mol	100.087 g/mol

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	75 - 120	75 - 120
Hardness, Vickers	105 - 136	105 - 136
Hardness, Mohs	3.0	3.0
Abrasive Hardness	4.5	4.5
Drilling Hardness	50	50

Thermal Properties	Metric	English	Comments
Heat of Fusion	57.35 J/g	24.67 BTU/lb
CTE, linear	4.60 µm/m-°C @Temperature 20.0 - 200 °C	2.56 µin/in-°F @Temperature 68.0 - 392 °F	calculated from volumetric expansion
	8.30 µm/m-°C @Temperature 20.0 - 500 °C	4.61 µin/in-°F @Temperature 68.0 - 932 °F	calculated from volumetric expansion
Specific Heat Capacity	0.8343 J/g-°C	0.1994 BTU/lb-°F	Crystal
Melting Point	1330 °C	2430 °F
Heat of Formation	-1207.6 kJ/mol	-1207.6 kJ/mol	Crystal

Optical Properties	Metric	English	Comments
Refractive Index	1.486	1.486	n_a
	1.658	1.658	n_ß

Descriptive Properties
Color	White
Solubility	Insoluble in H₂O; Soluble in Diluted Acid

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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BMIN016 / 183

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