Andesine is a fascinating gemstone belonging to the plagioclase feldspar mineral group. Scientifically, it is classified as a sodium-calcium aluminum silicate with the chemical formula (Na,Ca)(Si,Al)₄O₈. It crystallizes in the triclinic crystal system and is part of a continuous mineral series between albite and anorthite. Andesine is valued for its attractive colors and moderate durability, making it suitable for use in jewelry. The gemstone typically occurs in shades of red, orange, pink, yellow, and green. Among these, red andesine is the most valuable and sought after. The color is usually caused by trace elements such as copper or iron. Andesine can be transparent to translucent and exhibits a vitreous (glass-like) luster, giving it a pleasing shine when cut and polished.