10 Amazing Things To Know About Feldspar

Microline Potash Feldspar


What is Feldspar?

Feldspar is a form of natural occurring Silicate Mineral. Silicate Mineral can be defined as a Mixture of Silicon and Oxygen molecules bonding together to form a Silicate Mineral. The addition of other molecule ions like Aluminum, Sodium, Potassium, Lithium, Calcium, etc., inside silicate minerals, creates Feldspar Mineral.

When pure silicate mineral binds with these molecules, it forms a new structure capable of holding Sodium, Potash Ions, etc. Hence, we find different types and Varieties of Feldspar.

The most common appearance of Feldspar mineral can be found in White or Pink color depending on the molecules that are occupying inside silicate structure.

Microline Potash Feldspar


What are the types of Feldspar?

There are various structures and forms of feldspar.  The color range includes pink, white, gray, brown, blue. These are some of the commonly found types of feldspar listed below.

Alkali feldspars
  • Orthoclase
  • Sanidine
  • Microcline
  • Anorthoclase
Barium feldspars
  • Celsian
  • Hyalophane
Plagioclase feldspars (Calcium %)
  • Albite (0-10)
  • Oligoclase (10-30)
  • andesine (30-50)
  • Labradorite (50 to 70)
  • Bytownite (70-90)
  • Anorthite (90-100)
Microline Potash Feldspar


What is the chemical formulae of Feldspar?

  • Orthoclase Feldspar (Monoclinic): KAlSi3O8 

  • Sanidine Feldspar (Monoclinic): (K,Na)AlSi3O8 

  • Microcline Feldspar (Triclinic): KAlSi3O8

  • Anorthoclase Feldspar (Triclinic): (Na,K)AlSi3O8 

  • Celsian Feldspar (Monoclinic): BaAl2Si2O8 

  • Hyalophane Feldspar (Monoclinic): (K,Ba)(Al,Si)4O8 

  • Albite Feldspar (Triclinic): NaAlSi3O8 

  • Oligoclase Feldspar (Triclinic): (Na,Ca)(Al,Si)AlSi2O8 

  • Andesine Feldspar (Triclinic): NaAlSi3O8 – CaAl2Si2O8

  • Labradorite Feldspar (Triclinic): (Ca,Na)Al(Al,Si)Si2O8 

  • Bytownite Feldspar (Triclinic): (NaSi,CaAl)AlSi2O8

  • Anorthite Feldspar (Triclinic): CaAl2Si2O8 
Microline Potash Feldspar


What are the different Structures of Feldspar?

There are  2 main types of Feldspar Crystalline Structure:

  • Monoclinic
  • Triclinic

A) Monoclinic structure: It can be defined as 3 Dimensional structure with an Unequal measurement of height, width, and depth and any 2 axis(x,y,z axis) are perpendicular to each other.

B) Triclinic Structure: It can be defined as 3 Dimensional structure with an Unequal measurement of height, width, and depth and all 3 axis are not perpendicular to each other.

Microline Potash Feldspar


What are the Physical Properties of Feldspar?

  • Chemical Classification: Silicate
  • Specific Gravity: 2.5 to 2.8
  • Mohs Hardness: 6 – 6.5
  • Luster: Vitreous
  • Melting Point: ~ 1200 Degree C
  • Shrinkage: 9 -14%
  • Color After Firing: Mild range of matte Whiteness or Glossy White or Dark Brown to black shade in Fe-Ti Bonding Feldspar.

Note: For Ceramic use low Iron feldspar is suitable and more Whiteness and brightness after firing is required to manufacture the best products.

Microline Potash Feldspar


What Is The Chemical Composition Of Feldspar?

Chemical Composition of Feldspar can include the list of elements as Follows:

  • Si – Silicon
  • O – Oxygen
  • Al – Aluminum
  • K – Potassium
  • Na – Sodium
  • Ca – Calcium
  • Ba – Barium
  • B – Boron
  • Li – Lithium
  • Rb – Rubidium
  • Sr – Strontium
  • Ti – Titanium
  • Fe – Iron (impurity)
  • NH4 – Nitrogen – hydrogen 
Microline Potash Feldspar


Why Sodium Feldspar?

  • High Melting Strenght
  • White color after firing
  • Used for ceramics 
Microline Potash Feldspar


Why Potassium Feldspar?

  • High white Bright Melt for ceramic application
  • Artificial Intelligence sorting and Processing with 99% accuracy.
  • Flux agent with high viscosity
Microline Potash Feldspar


What Are The Uses Of Feldspar?​

  • Ceramics industry
  • Glass Industry
  • Frits Enamels
  • Paint Industry
  • Rubber Industry
  • Refractory
Mining Feldspar


What should you know before buying Feldspar?

  • Impurity Checks like Fe, Ca for ceramic and Glass Industry.
  • Shrinkage value of material check.
  • Firing Temperature check for specific industry
  • High Whiteness value must be preferred for glaze applications.
  • L A B S Channel for correct color
  • Sorting types check: Manual vs Automatic Machine
  • High Quartz Contamination may degrade value of Oxide like RO2
  • Find the trusted Mining Companies if you are looking to source from India by checking the Certification of the Indian government.
  • Make clear agreement while buying Low-Cost High-Grade Feldspar material as people might scam you by providing material through illegal means.
  • Ask the Company to provide 5-10 most recent Lab Reports or an SGS report and GST Number (Bussiness ID in India).

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