Uses Of Granite: Definition, Physical & Chemical Properties

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Granite is an igneous rock and forms when magma of the volcano oxidises and slowly begins to solidify under the ground. Granite is one of the most popular rocks which is extensively used by humans. It is abundantly used by humans due to its easy availability, cost and physical properties like strength, hardness and resistance.

Also Check: Igneous Rocks

Key Terms: Igneous Rock, Magma, Silica, Crust, Volcano, Intrusive Rock, Mica, Quartz


What Is Granite?

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Granite is an intrusive grainy igneous rock. It is used in both outdoor and indoor ways. Granite is made of up to 20% quartz, 65% of feldspar and mica, with some minerals. The spark in granite is due to embedded mica in it. It is too grainy in appearance. 

Granite

Granite


Physical Properties Of Granite

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The physical properties of rock granite are: 

  • The silica content in granite is very dense. 
  • Due to a large amount of silica in the composition of granite it is highly resistant to decay.
  • Granite is an easily quarried and available stone. 
  • The abundance of rift and the grain on granite makes it easy to utilise for various purposes.
  • The igneous property of granite makes it usable for construction purposes.
  • Granite is resistant to fire.
  • Granite has reasonable resistance to frost.

Chemical Properties Of Granite

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The chemical properties of granite are as specified below: 

  • The core component of granite is made up of 70 to 77 % of silica. 
  • In granite the presence of alumina is 11 to 14 % of its chemical composition.
  • The potassium oxide and soda make in granite about 3 to 5 % of their composition.
  • Granite also contains lime up to 1 % of its composition. 
  • The other components like iron oxides, magnesium, titanium and water are also present in granite. The proportion ranges from 1 % to 0.03 %.

Formation Of Granite

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The formation of granite takes place when the magma of a volcano oxidizes and slowly begins to solidify under the ground. Various minerals and chemicals present in magma start reacting which further leads to the formation of igneous rocks.

Granite is made up of quartz, feldspar and mica. When magma of a volcano forms silica with oxides and alkali metals solidifies, it ends up forming granite stone. Granites are abundantly found in the continental crust. 

Formation Of Granite

Formation Of Granite

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Uses & Applications Of Granite

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The usage and applications of granite are as follows:

  • Granite In The Kitchen: it is extensively used as countertops and backsplashes.
  • Granite In Construction: from middle age, buildings of granite have been observed due to their frost and fire resistance properties.
  • Granite As Fireplace Mantle: to enhance the beauty of the fireplace mantle, granite is used.
  • Granite In Flooring: due to the strength of granite, it is used in flooring, tiling, etc. 
  • Granite In Monuments: the long-lasting monuments like museums, temples, and gravestones
  • Granite In Jewellery: some rare stones found in specific areas like K2 Azurite, knowns to be gemstones, are used in the making of jewellery. 
  • Other Uses Of Granite: it is used in the making of roads and bridges. 

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Things To Remember

  • Granite is an intrusive grainy igneous rock.
  • Granite also contains lime up to 1 % of its composition.
  • The silica content in granite is very dense. 
  • To enhance the beauty of the fireplace mantle, granite is used.
  • The spark in granite is due to embedded mica in it. 

Sample Questions

Ques. In which part of the earth’s crust granite is found in plentiful amounts? (3 Marks)

Ans. In the continental crust of the earth, granite is found in abundant amounts. Though the type of granite differs from region to region, specifically the colour and texture. Granite is found in large amounts due to its igneous rock composition which is the crystallization of the magma of a volcano. The property and availability of granite made it high in use

Ques. What is granite? (3 Marks)

Ans. Granite is an intrusive grainy igneous rock. It is used in both outdoor and indoor ways. Granite is made of up to 20% quartz, 65% of feldspar and mica, with some minerals. The spark in granite is due to embedded mica in it. 

Granite is one of the most popular rocks which is extensively used by humans. It is too grainy in appearance. Granite is an igneous rock and forms when magma of the volcano oxidises and slowly begins to solidify under the ground.

Ques. Is granite hard stone? (2 marks)

Ans. Granite lies in the second number due to its hardness property. The formation of granite is from the solidification of silica and iron oxides, so strength is higher in comparison to other stones. 

Ques. What are the physical properties of granite? (5 Marks)

Ans. The physical properties of rock granite are: 

  • The silica content in granite is very dense. 
  • Due to a large amount of silica in the composition of granite it is highly resistant to decay.
  • Granite is an easily quarried and available stone. 
  • The abundance of rift and the grain on granite makes it easy to utilise for various purposes.
  • The igneous property of granite makes it usable for construction purposes.

Ques. Granite is a ___ rock. (1 Marks)
(a) Extrusive 
(b) Intrusive
(c) Soft
(d) Metamorphic

Ans. b. Intrusive

Explanation:  Granite is an intrusive rock as the intrusive rocks forms from molten material which flows and solidifies under the earth’s crust, where magma cools slowly. The same formation method is followed by granite. Hence, granite is intrusive rock.

Ques. Granite is abundantly found in __ crust of the earth. (1 Mark)
(a) Oceanic
(b) Continental

Ans. b Continental 

Explanation: Continental crust is approx 70-80% composed of various types of granites. Granites form a major part of the continental crust. Either it is about forming small stocks or batholiths, most commonly and abundantly found in mountain ranges like the Himalayas, where a continental collision has taken place.

Ques. Mention five chemical properties of granite? (4 Marks)

Ans. The chemical properties of granite are as specified below: 

  • The core component of granite is made up of 70 to 77 % of silica. 
  • In granite the presence of alumina is 11 to 14 % of its chemical composition.
  • The potassium oxide and soda make in granite about 3 to 5 % of their composition.
  • Granite also contains lime up to 1 % of its composition. 
  • The other components like iron oxides, magnesium, titanium and water are also present in granite. The proportion ranges from 1 % to 0.03 %.

Ques. How is granite useful for human use? (4 Marks)

Ans. The usage and applications of granite are as follows:

  • Granite In The Kitchen: it is extensively used as countertops and backsplashes.
  • Granite In Construction: from middle age, buildings of granite have been observed due to their frost and fire resistance properties.
  • Granite As Fireplace Mantle: to enhance the beauty of the fireplace mantle, granite is used.
  • Granite In Flooring: due to the strength of granite, it is used in flooring, tiling, etc. 
  • Granite In Monuments: the long-lasting monuments like museums, temples, and gravestones

Ques. State two applications of granite. (3 Marks)

Ans. The two applications of granite are: 

  • Granite In Monuments: the long-lasting monuments like museums, temples, and gravestones
  • Granite In Jewellery: some rare stones found in specific areas like K2 Azurite, knowns to be gemstones, are used in the making of jewellery. 

Ques. What type of rock is granite? (2 Marks)

Ans. Granite is an igneous rock that forms when magma cools slowly in the continental crust. Granite is composed of several minerals like quartz, feldspar, and mica.

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