Blue Limestone Tiles

Blue Limestone Tiles

How is it formed?

Limestone is formed in two ways.

It can be formed with the help of living organisms and by evaporation.

Ocean-dwelling organisms such as oysters, clams, mussels, and coral use calcium carbonate (CaCO3) found in seawater to create their shells and bones. As these organisms die, their shells and bones are broken down by waves and settle on the ocean floor where they are compacted over millions of years, creating limestone from the sediments and the pressure of the ocean water.

The second way limestone is formed is when water containing particles of calcium carbonate evaporate, leaving behind the sediment deposit. The water pressure compacts the sediment, creating limestone.

The area around the Great Lakes, such as Michigan, Indiana, and Illinois, has a large amount of limestone. Scientists use this along with evidence of fossils to hypothesize that at one time the area was underwater, which created a lot of limestones.

What does it look like?

Because limestone is often formed from shells and bones, it is a light color like white, tan, or gray. 

The color of the limestone depends on the other sediments in the mixture besides the mineral calcite, which is white; impurities such as sand, clay, and organic material are also present in limestone and affect the color.

There are a few ways to recognize limestone. First of all, it is a soft stone and when it is scratched with a sharp object, it becomes a white powder.

When limestone comes in contacts with an acid like vinegar or hydrochloric acid (HCl), the stone will actually bubble and deteriorate and then neutralize the acid.

What is it used for?

Limestone has quite a history. Long ago, limestone was used to build the pyramids in Egypt. And Romans would mix limestone with volcanic ash to form a type of concrete for building structures in Rome.

Limestone is important to making cement, but it is also found in other industries such as sugar refining, glass making, and leather tanning.

Crushed limestone underneath roads and underneath railroad tracks. When limestone is heated, it helps manufacture iron and steel as well as alumina and magnesia.

Limestone helps clean drinking water and treat sewage. Farmers will often spread fertilizer that contains ground-limestone on their crops. The limestone in the mixture is a source of plant nutrients and neutralizes soil acidity.

Because it is a softer stone, it is easily carved. Limestone appears in many buildings. Indiana limestone, also known as Salem limestone, can be found at the Empire 

State Building in New York City and on the U.S. Holocaust Memorial and Museum in Washington D.C.

Types of Limestone

Coquina: Limestone that contains large pieces of shells or coral

Chalk: Limestone that is formed from microscopic marine organisms

Travertine: Limestone formed around a spring or a waterfall

Oolite: Limestone that is formed around high-temperature areas such as tropical seas or lagoons

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