Dolomite Powder Manufacturer

What is it?

It is a naturally occurring mineral CaMg(CO3)2.

Molecular structure:

Dolomite structure is formed by an ionic interaction of Mg2+ (magnesium cation), Ca2+ (calcium cation), and CO32- (carbonate anion). For every two carbonate anions there is one magnesium cation and one calcium cation, thereby making the structure electrically neutral. A common pattern of arrangement of ions is shown below:


  1. Tactile properties: It is slightly rough and abrasive.
  2. Visual properties: slide-5
    • Color: It is often in pink or pinkish and can be colorless, white, yellow, gray or even brown or black when iron is present in the crystal white, grey, pink color
    • Lustre: It is vitreous to pearly to dull
    • Streak: It is white.
    • Diaphaneity: It is opaque
  3. Structural properties:
    • Hardness: 3.5-4 mohs.
    • Specific gravity: 2.84-2.86.
  4. Affinity to water: It has the ability to adsorb and absorb moisture. However, its solubility in pure water is poor though it readily disperses in water.
  5. Affinity to oil: It has low oil absorption capacity.
  6. Heat properties:
    • Thermal conductivity: 5.1 W m-1 K-1 at 20 °C, It exhibits a two stage decomposition (750 ° Dolomite and MgO; 900 ° CaO and MgO)
    • Specific heat capacity: 900 J kg-1 K-1 at 20 °C
    • Mean thermal expansion coefficient: 4.1×10-6/°C.
    • Melting Point: 2570 °C.
  7. Electric properties: It is poor conductor of electricity.
  8. Combustion properties: It is non explosive and non-inflammable.
  9. Chemical properties: It’s effervesces is weak with warm acid or when first powdered, with cold HCl.


Theoretically, dolomite contains 54.35% CaCO3 and 45.65% MgCO3. Its composition can also be expressed in terms of the oxides. Thus, in other words, it contains 30.4% CaO, 21.7% MgO and 47.9% CO2.

However, in nature considerable variations arise in dolomite due to the following factors:
  1. Varying proportions of lime and magnesia.
  2. Presence of impurities, chiefly silica, alumina and iron oxide.
  3. Differences in geological formations.

We have described below the different grades of Dolomite which Anand Talc can provide based on its various applications:
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