Sulphur exists in six forms in the solid state. This property is known as?

The property of Sulphur existing in six different forms in the solid state is known as allotropy. Allotropy is a property of an element to exist in two or more different forms, called allotropes, which have different physical and chemical properties but the same chemical formula. In the case of Sulphur, the six allotropes are known as S1, S2, S3, S4, S5, and S6, which have different crystal structures and colors. Allotropy is a common phenomenon in many elements, including Carbon, Oxygen, and Phosphorus, among others.