Abstract: The sodalite group minerals (SGM), including sodalite, haüyne, nosean, and related species, are aluminium silicate minerals that typically crystallize in alkaline-peralkaline rocks and are enriched in volatile elements such as sulfur (S) and chlorine (Cl). Despite their geochemical significance, research on SGM remains limited, particularly regarding their textural characteristics and geochemical compositions, which has hindered a comprehensive understanding of their classification and formation mechanisms. A detailed comparative study of the petrography and geochemistry of SGM samples was conducted, focusing on specimens from the Pinghe Complex (Sichuan Province, China), Niangniangshan Complex (Jiangsu Province, China), and Jebel Dumbier Complex (Sudan). This analysis was complemented by incorporating global SGM datasets to enhance the scope and robustness of the findings. A novel classification scheme for SGM species is proposed, based on the SO₄²⁻/X ratios (where X represents the anion content in atoms per formula unit, apfu) and X values. This framework distinguishes sodalite, nosean, and haüyne along a continuum of geochemical evolution. From sodalite to nosean and finally to haüyne, the ratios of Rb/Sr, Ba/Sr, Be/Sr, and B/Sr decrease progressively as Sr content increases. Conversely, total rare earth element (REE) concentrations and the degree of differentiation between light rare earth elements (LREE) and heavy rare earth elements (HREE) increase systematically. The S/Cl ratios in sodalite serve as a proxy for magma composition, while variations in Cl and S compositions reflect changes in melt volatile content during magmatic evolution. The clathrate texture observed in haüyne and the patchy texture in nosean are interpreted as resulting from mineral inclusions and solid exsolution processes, respectively. This study advances the understanding of SGM formation mechanisms and provides a refined framework for their classification, emphasizing the interplay between volatile elements, textural features, and geochemical evolution.