You searched for: “andalusite
Aluminum silicate, a white to pinkish mineral crystallizing as square-based or rhombus-based prisms.

It is common in metamorphic rocks formed from clay sediments under low pressure condition. Andalusite, kyanite, and silimanite are all polymorphs (a compound that has several crystalline forms) of aluminum silicate.

This entry is located in the following unit: Geology or Related Geological Terms + (page 3)