What is Andalusite? How is andalusite formed?

in this video, what is andalusite? How is andalusite formed? Detailed information was given to students and geological engineers.
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[@jay-araping]

I have andalusite

[@professionalgeologyclub]

Nice

[@user-nj5py5gk4z]

Sir I have meny Andalusite but opaque very beautiful near by Alexandrite it's find mud clear very good colors