Potassium aluminium silicate is a term used to describe a class of minerals that are commonly found in the earth's crust. However, there are several synonyms for this compound that are used in different contexts. One commonly used synonym is feldspar, which is a common mineral found in rocks and soil. Another synonym for potassium aluminium silicate is orthoclase, which refers specifically to a type of feldspar that is commonly used in the manufacturing of ceramics. Lastly, another common synonym for this compound is kyanite, which is a mineral that is commonly found in metamorphic rocks and is used in the production of high-temperature materials such as refractory bricks.