Feldspar Powder Manufacturer

What is it?

Feldspar comprises of group of aluminum silicate that contains sodium (NaAlSi3O8), potassium (KAlSi3O8)or calcium(CaAl2Si2O8).Feldspars are the most abundant mineral in Earth’s crust, making up more than 60% of the crust.

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Molecular structure

The basic unit of feldspar structure is a tetrahedron of silicon and oxygen (SiO4) and aluminium and oxygen (AlO4–). These tetrahedra are covalently bonded to each other through oxygen atoms to form a three dimensional framework. Low-charge cations like Na+, K+ or Ca2+ occupy the larger voids in the tetrahedral framework to provide charge balance against the aluminium tetrahedra.


  1. Tactile properties: It is rough and abrasive.
  2. Visual properties:
    • Color: Orthoclase: It is light colored; usually white, pink, yellow, or cream in color. Microcline: It is white, pink, pale yellow, or sometimes green-blue in color. Plagioclase: Gray to grayish-white color is common, but may also be white, pink or pale yellow in color.
    • Lustre: It is vitreous.
    • Streak: It is white.
    • Diaphaneity: It is opaque.
  3. Structural properties:
    • Hardness: 6-6.5 mohs.
    • Specific gravity:2.6
  4. Affinity to water: It dissolved slightly in water, releasing the alkali metal ions.
  5. Affinity to oil: It has low oil absorption capacity.
  6. Heat properties:
    • Thermal conductivity: 2.3-2.5 W/m/K.
    • Specific heat capacity: 222 J/M/K.
    • Coefficient of expansion: 13.1 to 30.6.
    • Melting point: 1200 to 1400 °C.
    • Decomposition temperature: 1473K
  7. Electric properties: It does not conduct electricity.
  8. Combustion properties: It is non explosive and non inflammable.
  9. Chemical properties: It dissolves in acid, releasing the alkali metal ion and aluminium ion


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