https://www.stellarmr.com/report/andalusite-market/2547 Andalusite is an aluminium nesosilicate mineral that belongs to the sillimanite family and is found in transformational rocks. It is a polymorph of two minerals, kyanite and sillimanite, and is called after the Andalusia region in Spain. Because of its polymorphism, it has a similar synthetic component but a different real design than kyanite and sillimanite.