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Wollastonite Powder (Calcium Metasilicate) from READE PDF Print E-mail


  • Wollastonite (Calcium Metasilicate) Synonyms:

calcium metasilicate, wollastonite, tabular spar, table spar, wollastonite powder, okenite, vilnite, rivaite, schalstein, gillebachite, CaSiO3, CaO.SiO2, aedelforsite, CAS# 13983-17-0,

  • Wollastonite (Calcium Metasilicate) Designations:

Chemical Name: Calcium metasilicate

Chemical Formula: CaSiO3 or CaO.SiO

  • Wollastonite (Calcium Metasilicate) General Description:

1) Wollastonite is a white to yellowish-brown naturally occurring mineral. It has good strength, firing characteristics and ability to reduce crazing. It is comprised chemically of calcium, silicon and oxygen. It's molecular formula can be expressed as CaSiO3 or as CaO.SiO2. It is commonly referred to as calcium metasilicate according to the now obsolete classification of silicates as oxyacids of silicon, a salt of hypothetical metasilicic acid: H2SiO3. It has a theoretical composition of 48.28% CaO and 51.72% SiO2.

2) Natural wollastonite however, may contain trace or minor amounts of various metal ions such as aluminum, iron, magnesium, manganese, potassium and sodium. Any of these ions may partially substitute for calcium if they are present. Wollastonite is rarely found by itself, and ore zones in the major deposits contain 20-98% wollastonite. Associated minerals are most often calcite, garnet, and diopside.

  • Typical Wollastonite (Calcium Metasilicate) Chemical Purities Available:

Theoretical composition: CaO= 48.3% and SiO2= 51.7%. The typical is: CaO= 47.0% and SiO2= 50.0%

  • Typical Wollastonite (Calcium Metasilicate) Granulations Available:

Various granulations are available. Primarily 10 X 100 mesh, 200 mesh X down and 325 mesh X down

  • Typical Wollastonite (Calcium Metasilicate) Physical Constants:  

Molecular Weight (g/mol.)


Density (lbs./solid gallons)


Specific Gravity

2.8- 2.9

Specific Heat @25°C (cal/g-°C)


Melting Point (°C)


Boiling Point (°C)


G. E. Brightness


Thermal Conductivity @20°C (cal/s-cm-°C)


Mohs Hardness @20°C

4.5- 5.0

pH (aqueous solution)

9- 10





Oil Absorption

22- 45

Refractive Index


Hegman Grind

4- 7


  • Typical Wollastonite (Calcium Metasilicate) Applications:

1) As a source of silica and alkalis in the production of ceramics. Used to produce wall tiles, semivitreous bodies, ceramic insulators and glazes, thermoplastics, adhesives, and ceramic-bonded abrasives.

2) Wollastonite has been found useful as a soil conditioner and an additive to plant fertiliser for it’s reactivity in acid conditions. As opposed to lime or calcite, it offers long-term protection against the acidification of soils. In some countries, wollastonite has also found use as an inert carrier for pesticides and insecticides.

  • Wollastonite (Calcium Metasilicate) Packaging Options:

Drums, bulk bags or loose bulk

  • Wollastonite (Calcium Metasilicate) TSCA (SARA Title III) Status:

Listed. For further information please call the U. S. Environmental Protection Agency at +1.202.554.1404

  • Wollastonite (Calcium Metasilicate) Chemical Abstract Service Number:

CAS# 13983-17-0

  • Wollastonite (Calcium Metasilicate) Harmonized System Code:





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