Cristobalite

From whiteness to durability, Sibelco cristobalite sands and powders bring a wide range of benefits as a specialist additive in engineered stone, coating and polymer applications.

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about

Cristobalite

Sibelco 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. Our cristobalite sands and powders (brand name SIBELITE®) offer one of the highest brightness levels of any mineral.

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