Calcium Carbonate

Calcium carbonate (CaCO3) is composed of three elements which are of particular importance for all organic and inorganic material on our planet: carbon, oxygen and calcium. It is a white solid, is non-toxic and odourless.

Calcium carbonate comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years.

Although all three forms are identical in chemical terms, they differ in many other respects, including purity, whiteness, thickness and homogeneity. Calcium carbonate is one of the most useful and versatile materials known to man.


Calcium Carbonate (CaCO3)98.5%
Magnesium Carbonate (MgCO3)0.70% max
SiO20.30% max
Al2O3< 0.01% max
Fe2O3< 0.08% max
Total Acid Solubility98.00% max
Moisture1.00% max
(L value - Hunter)
96% min
B value - Hunter1.0 max
Sizing0-120mm pebbles available

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