Cobcraft kiln furniture materials are often called ‘cordierite’, but a more accurate description would be ‘cordierite/mullite’ as the material is a mixture of both minerals. There is also a small amount of silica glass that forms a glassy-bond between the larger grains, and sometimes small amounts of corundum and/or zircon. Cordierite kiln furniture is the material of choice for firing and heat-treatment processes below 1300oC due to the unique blend of properties.
