Cristobalite

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Cristobalite is a high temperature polymorph of high purity quartz, produced at 1,500°C through calcination and iron-free grinding. 

The calcination process changes the crystalline composition of the quartz, creating a more open ring structure of Si02 units

Cristobalite can be characterised by:

  • High brightness

  • Relatively high Mohs hardness of 6.5
  • Relatively low refractive index
  • Easy wetting
  • High inertness in various media
  • Transparency for UV-radiation 

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