what is the definition of limestone

Limestone is a sedimentary rock composed principally of calcium carbonate (calcite) or the double carbonate of calcium and magnesium (dolomite). It is commonly composed of tiny fossils, shell fragments and other fossilized debris.

Where is limestone found in India?

Rajasthan was the leading producing state accounting for (21%) of the total production of limestone, followed by Madhya Pradesh & Andhra Pradesh (11% each), Chhattisgarh & Karnataka (10% each), Gujarat,Tamil Nadu & Telangana (8% each), Maharashtra & Himachal Pradesh (4% each), and the remaining 5% was contributed by …

What is a limestone region?

Limestone and chalk are sedimentary rocks of organic origin derived from the accumulation of corals and shells in the sea. … Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acid. A region with a large stretch of limestone therefore possesses a very distinct type of topography.

Is limestone an impermeable rock?

As limestone is a permeable rock, water is able to seep down through the cracks and into the rock. Rainwater is a weak carbonic acid which reacts with the limestone as it passes through the rock, dissolving the stone while enlarging joints and bedding planes.

How is lime made?

Lime is made by first burning chalk or limestone to form quick lime (calcium oxide) and then slaking the quicklime with water (forming calcium hydroxide). If no clay is present in the original limestone or chalk, the resulting lime is said to be ‘non-hydraulic’.

Who discovered limestone?

3000 B.C. The Egyptians tanned their skin with lime and built one of the limestone wonders of the world; the 137 m high Cheops pyramid.

What are types of rocks?

There are three kinds of rock: igneous, sedimentary, and metamorphic.

Which ions form limestone?

Marine limestone forms because seawater has high concentrations of two key dissolved chemicals—calcium (Ca++) and bicar- bonate (HCO3 –) ions. In the near-surface layer of most oceans, corals, clams, and Earth’s surface.

Is limestone the hardest rock?

These arbitrary labels are based on the premise that igneous and metamorphic (crystalline) rocks—granite and gneiss, e.g.—are harder than sedimentary rocks, such as limestone and shale. Calcite in limestone is quite as hard as that in marble, and the grains of quartz in sandstone are as hard as those in quartzite.

Is slate a rock?

slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having great tensile strength and durability; some other rocks that occur in thin beds are improperly called slate because they can be used for roofing and similar purposes.

Is slate a sedimentary rock?

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. … Slate is not to be confused with shale, from which it may be formed, or schist.

What is it made of granite?


what is the definition of limestone



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