What is polar jade primarily classified as?

Polar jade is primarily classified as nephrite. Nephrite is one of the two minerals that are commonly referred to as jade, the other being jadeite. Nephrite is a form of jade that typically exhibits a more fibrous structure and is often a deeper green in color. It is valued for its toughness and is commonly used in carvings and other decorative items.

Understanding that polar jade is nephrite is crucial because nephrite has different physical and chemical properties than jadeite, including its composition, which affects its appearance and how it can be worked. The distinction between nephrite and jadeite is important in the gemstone market, as the two types of jade can vary significantly in terms of value and desirability.