GEOLOGY

Detailed explanation-1: -Kyanite is a polymorphic aluminum-silicate mineral that has the same chemical formula as the minerals andalusite and sillimanite, Al2SiO5.

Detailed explanation-2: -Kyanite, andalusite, and sillimanite are naturally occurring anhydrous aluminum silicate minerals. Each has the same chemical formula, Al2SiO5, but differing crystal structures, making them mineral polymorphs.

Detailed explanation-3: -The Al2SiO5 Group The group consists of three polymorphs: kyanite, sillimanite, and andalusite. These polymorphs all contain Si4+ in four-fold coordination and Al3+ in six-fold coordination, but sillimanite and andalusite also contain aluminum in four-fold and five-fold coordination, respectively.