Chemical Formula Of Marble Chalk Limestone

Chalk is a soft white porous sedimentary carbonate rock a form of limestone composed of the mineral calcite.

Chemical formula of marble chalk limestone.

Think about this next time you use chalk that white stuff all over your hands is actually countless individual shells each microscopic in size and the former home of a living being. Calcite is an ionic salt called calcium carbonate or caco 3. The chemical formula caco3represents a raw material that exists everywhere in nature whether dissolved in rivers and oceans melted as cold carbonatite lava and solidified as a mineral dripstone or as a parent material for whole mountain ranges. In the lime industry limestone is a general term for rocks that contain 80 or more of calcium or magnesium carbonate including marble chalk oolite and marl.

It is a common substance found in rocks as the minerals calcite and aragonite and is the main component of pearls and the shells of marine organisms snails and eggs. Marble has a hard crystalline structure while chalk is amorphous in nature. Limestone crystals are much smaller than that of marble and limestone is much more porous. Chalk is calcium carbonate and has the same chemical composition as limestone marble ground calcium carbonate and precipitated calcium carbonate.

Chalk like the other types of calcium carbonate is in the form of calcite which is a crystal. The formula for limestone marble and chalk is same i e caco3 all of them are a form of calcium carbonate. Calcium carbonate is a chemical compound with the formula caco3. Calcite limestone chalk marble travertine aragonite and vaterite are calcium carbonate mineral sources.

Marble is made of calcium carbonate caco3 which is also what limestone is made from. Chemically there is no difference in them but they differ in their physical structure. Further classification is done by composition as high calcium argillaceous clayey silicious conglomerate magnesian dolomite and other limestones. Chalk is a variety of limestone which is composed primarily of the shells of single celled calcium carbonate secreting creatures.

The only difference between limestone and marble is the crystalline structure. Calcium carbonate is a chemical compound and calcium salt with the formula caco3. Properties of rock is another aspect for limestone vs chalk. The hardness of limestone is 3 4 and that of chalk is 1.

It is medicinally used as a calcium supplement or as an antacid but excessive consumption can be hazardous a. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite shells coccoliths shed from micro organisms called coccolithophores.