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Information @ a Glance


  • Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate.
  • Cordierite typically occurs in contact or regional metamorphism of argillaceous rocks.
  • Two common metamorphic mineral assemblages include sillimanite-cordierite-spinel and cordierite-spinel-plagioclase-orthopyroxene.
  • Cordierite most important feature is that it has a very low coefficient of thermal expansion and excellent resistance to thermal shock.
  • Cordierite was known and used as a gemstone in Sri Lanka.

Production Process

  • Cordierite materials and others based on it are magnesium aluminosilicates, fabricated by sintering soapstone or talcum with the addition of clay, kaolin, fireclay, corundum and mullite.
  • Cordierite can be made in high volume through cost-effective extrusion or dry-pressing methods.
  • Cordierite is a common constituent in contact metamorphosed argillaceous or arenaceous sediments and in regionally metamorphosed settings where it occurs only in high grade gneiss.
  • The dumortierite-bearing cordierite-orthoamphibole rocks occur as thin layers and lenses in the upper-amphibolite facies area of the central part of the Bamble Sector.


  • Cordierite diesel particulate filters provide an economical approach to diesel emissions control.
  • Cordierite honeycomb monoliths of square channels (Corning, 400 cps, 0.17 mm average wall thickness) were used as substrates for the Preparation of Washcoated Monolith.
  • Indialite, the rare high-temperature hexagonal form of cordierite. Synthetic hexagonal cordierite is often found in glass ceramics and has a wide range of technical applications.
  • Synthetized cordierite was used as a refractory filler in the ceramic layer for evaporative polystyrene patterns in the new casting technology, Lost Foam Process.


  • Cordierites have low coefficients of thermal expansion and excellent resistance to thermal shock. They offer a range of thermal expansion,
    mechanical strength and porosity criteria. They excel as cost-effective extruded and dry-pressed forms.
  • 447 offers excellent thermal shock resistance with high continuous porosity, suitable for applications such as welding tile.
  • 547 offers very good thermal shock resistance with improved flexural strength due to its semivitreous properties. It is able to withstand rapid
    temperature fluctuations, such as those found in oil burner applications.
  • 701 also offers very good thermal shock resistance, good flexural strength and 0-1% porosity due to its vitrified properties. This cordierite can self-glaze. It is suitable for applications such as commercial heater supports.

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