Three naturally occurring important ceramic minerals of silicates of alumina have been intensively studied due to their prime importance in ceramic fields. They all have the formula Al2O3.SiO2 but differ in crystalline character and physical properties. The following are the three minerals:
1. Sillimanite
2. Andalusite
3. Kyanite
The important properties in ceramics for the three minerals studied were
1. The conditions under which they are stable
2. The conditions under which they are mutually convertible
3. The conditions under which they are occurring in industrial products.
At normal temperatures and pressures only one of the can be stable.
To be contd……….
