Andalusite is a naturally occurring alumino-silicate mineral with a high alumina content commonly found in metamorphic rocks as elongated rhombic prisms. It is a high-purity mineral composed of prismatic and anhydrous crystals.

Andalusite is a precious raw material in the production of refractories requiring high-alumina content and foundry castings (for the production of sand moulds and cores for steel and iron casting) as well. Containing up to 60% alumina, andalusite transforms into mullite at low temperatures of between 1200°C and 1550°C. This refractory mineral offers properties such as high resistance to degradation in extreme temperatures and harsh operating conditions as well as resistance to mechanical failure and corrosion.