Feldspar: Composition, Structure, Types, Usage, Substitute

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Feldspar is a group of minerals that consists of alumina and silica in their chemical makeup. Feldspar is a natural mineral. They can also be described as a group of rock-forming silicate minerals. It is one of the most common mineral groups and forms about 60% of rocks, clay, sand. And various other unconsolidated sediments. They are an integral part of rock classification schemes. Orthoclase, plagioclase feldspars, microcline, etc., are members of feldspar. Here we will learn more about Feldspar, its composition, structure, etc.

Table of Content

Feldspar Chemical Formula
Properties of Feldspar
Feldspar Composition
Feldspar Structure
Types of Feldspar
Uses of Feldspar
Substitute of Feldspar
Mining of Feldspar
Things to Remember
Sample Questions

Key Takeaways: Feldspar, Natural Minerals, Orthoclase, Alumina, Silica

Read More: Number of Moles Formula

Feldspar Chemical Formula

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Potassium feldspar chemical formula or (K-spar) formula- KAlSi₃O₈
Sodium feldspar chemical formula or albite formula- NaAlSi₃O₈
Calcium feldspar chemical formula- CaAl₂Si₂O₈

Properties of Feldspar

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Feldspar's chemical formula depends on its composition. Each chemical formula has a different composition. The specific chemical formula is KAlSi₃O₈ – NaAlSi₃O₈ – CaAl₂Si₂O₈
The minerals have a constant pH value and are chemically alert.
As per the physical properties of Feldspar, it has a monoclinic or triclinic crystal system. The refractive index of this mineral is 1.518 - 1.526.
Feldspar has two cleavages that contain two planes that intersect each other at an angle of 90º.
The density of Feldspar is 2.56g/cm³.
According to the Mohs hardness scale, the hardness of Feldspar is 6 - 6.5.

Also Read:

Sedimentary Rocks	Metamorphic Rocks	Difference between Rocks and Minerals

Feldspar Composition

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Silicate minerals, also known as tectosilicates are a type of natural mineral. Silicon ions are joined by shared oxygen ions that form a three-dimensional network. Three endmembers define the compositions of major elements in common feldspar.

Feldspar Structure

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Feldspar crystal's backbone is made up of aluminosilicate tetrahedra. In each tetrahedron, an aluminum, also known as silicon ion, is enclosed by four oxygen ions. This forms a three-dimensional network when each oxygen ion is shared by tetrahedra.

In feldspar, long chains of aluminum silicate tetrahedra are present, called crankshaft chains due to their kinked form. Each crankshaft chain forms a three-dimensional network by fusing four-membered rings connected to the chains. The structure of the feldspar is open for cations (calcium, potassium, and sodium) so that they can fit inside and balance the charge.

Types of Feldspar

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There are two types of alkali feldspars:

Containing potassium in combination with sodium, aluminum, or silicon.
Containing barium (barium replaced potassium).

The first type includes:

Orthoclase (monoclinic) KAlSi₃O₈
Sanidine (monoclinic) (K, Na)AlSi₃O₈
Microcline (triclinic), KAlSi₃O₈
Anorthoclase (triclinic) (Na, K)AlSi₃O₈

Uses of Feldspar

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Bathroom tiles, construction tiles, dinnerware, etc. are all made of feldspar.
Feldspar is also used in the manufacturing of glass and ceramics.
Feldspar is used as a flux. Flux is used to decrease the melting temperature of a substance such as glass.

Substitute of Feldspar

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There is numerous substances that can be used as a substitute for feldspar. Pyrophyllite, talc, quartz mixtures, clays, etc. are a few of the minerals that are substitutes for feldspar. In the near future, these substances' demand will decrease due to the abundance of feldspar.

Also Read:

Igneous Rocks	Geochemistry	Minerals

Mining of Feldspar

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Top largest producer of feldspar is North Carolina, California, Idaho, Georgia etc. Feldspar is mined from gigantic granite bodies called plutons. The largest component of the Earth’s crust is feldspar thus it is believed that the supply of feldspar is sufficient enough to meet the demands for a long period of time. At present, the demand for raw feldspar is met by mines located all over the world.

Things to Remember

60% of Earth’s crust is made up of feldspar. Therefore, it is available in sufficient quantities.
Feldspar is divided into two broad categories: aluminum and silica.
Italy, Turkey, and China are the largest producers of Feldspar.
The pH value of feldspar is constant and remains the same.

Also Read: Natural Resources

Sample Questions

Ques. What is the chemical name of feldspar? (2 marks)

Ans. The chemical name of feldspar are as follows:

Potassium aluminum silicates (KAlSi₃O₈)
Sodium aluminum silicates (NaAlSi₃O₈)
Calcium aluminum silicates are (CaAl₂Si₂O₈)

Ques. Name some of the substitutes for feldspar? (2 marks)

Ans. A few of the substitutes for feldspar are

Pyrophyllite
Talc
Quartz mixtures
Clays

Ques. What are the different uses of feldspar? (2 marks)

Ans. Feldspar is used in the manufacturing of glass and ceramics. Moreover, bathroom tiles, dinnerware, etc. are also made of feldspar.

Ques. Which countries are the largest producer of feldspar? (2 marks)

Ans. As per the British Geological Survey data, Turkey is the largest producer of feldspar. Italy, Turkey, and China alone account for 55 percent of the world's feldspar.

Ques. What is the definition of feldspar? (2 marks)

Ans. Feldspar is defined as the group of minerals that comprises alumina and silica in their chemical makeup. Feldspar is a natural mineral and almost 60% of the earth's crust is made up of feldspar.

Ques. What are the properties of feldspar? (2 marks)

Ans. Some of the properties of feldspar are:

As per the physical properties of Feldspar, it has a monoclinic or triclinic crystal system. The refractive index of this mineral is 1.518 - 1.526.
Feldspar has two cleavages that contain two planes that intersect each other at an angle of 90º.
The density of Feldspar is 2.56g/cm³.
According to the Mohs hardness scale, the hardness of Feldspar is 6 - 6.5.

Ques. What are the different types of feldspar? (2 marks)

Ans. There are two broad types of feldspar.

Containing potassium in combination with sodium, aluminum, or silicon.
Containing barium (barium replaced potassium).

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Feldspar: Composition, Structure, Types, Usage, Substitute

Feldspar Chemical Formula

Properties of Feldspar

Feldspar Composition

Feldspar Structure

Types of Feldspar

Uses of Feldspar

Substitute of Feldspar

Mining of Feldspar

Things to Remember

Sample Questions

CBSE CLASS XII Related Questions

1.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.

2.
(a) Write two structural differences between DNA and RNA.
(b) Which component of starch is a branched chain polymer of \( \alpha \)-D-(+)-glucose ? Write its one characteristic feature.
(c) Which types of bonds hold the polypeptide chains in fibrous proteins ?

4.
Following reaction takes place in one step:

\(2A + B \rightarrow 2C\)

How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?

5.
Write the name of basic building units of proteins and nucleic acids. How can you differentiate between Fibrous and Globular proteins on the basis of their structures ?

6.
The chelating ligand used for the treatment of lead poisoning is :

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Feldspar: Composition, Structure, Types, Usage, Substitute

Feldspar Chemical Formula

Properties of Feldspar

Feldspar Composition

Feldspar Structure

Types of Feldspar

Uses of Feldspar

Substitute of Feldspar

Mining of Feldspar

Things to Remember

Sample Questions

CBSE CLASS XII Related Questions

1.An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it: (I) does not give Tollen's test but gives a positive iodoform test. (II) does not give Tollen's test and iodoform test but undergoes Aldol condensation. (III) undergoes Cannizzaro's reaction.

2.(a) Write two structural differences between DNA and RNA.(b) Which component of starch is a branched chain polymer of \( \alpha \)-D-(+)-glucose ? Write its one characteristic feature.(c) Which types of bonds hold the polypeptide chains in fibrous proteins ?

4.Following reaction takes place in one step:\(2A + B \rightarrow 2C\)How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?

5.Write the name of basic building units of proteins and nucleic acids. How can you differentiate between Fibrous and Globular proteins on the basis of their structures ?

6.The chelating ligand used for the treatment of lead poisoning is :

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.

2.
(a) Write two structural differences between DNA and RNA.
(b) Which component of starch is a branched chain polymer of \( \alpha \)-D-(+)-glucose ? Write its one characteristic feature.
(c) Which types of bonds hold the polypeptide chains in fibrous proteins ?

4.
Following reaction takes place in one step:

\(2A + B \rightarrow 2C\)

How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?

5.
Write the name of basic building units of proteins and nucleic acids. How can you differentiate between Fibrous and Globular proteins on the basis of their structures ?

6.
The chelating ligand used for the treatment of lead poisoning is :