Diversity, isomorphism and mutual conversions of sulfur-bearing species in natural tectosilicates: Applying a novel multimethodic approach

Twenty extra-framework S-and C-bearing species including anions (SO 4 2-, SO 3 2-, S 2- , S 5 2-, HS -, CO 3 2-, C 2 O 4 2-, HCO 4 -), radical anions (S 2 -, S 3 -, cis-and trans-S 4 -, SO 4 -) and neutral molecules (CO 2 , COS, H 2 S, cis-and trans-S 4 , S 6 ) have been identified in natural tectosilicates (members of the sodalite, cancrinite and scapolite groups) using a novel multimethodic approach based on several spectroscopic methods as well as single-crystal and powder X-ray diffraction as well as electron microprobe and wet chemical analyses.Various polysulfide groups were detected in lazurite, hayne, vladimirivanovite, sapozhnikovite, slyudyankaite, kyanoxalite, balliranoite, marinellite, tounkite, bystrite, sulfhydrylbystrite, and meionite.Experimental data on mutual conversions of S-bearing species and structure modulations of these minerals under different temperatures, reducing and oxidizing environment as well as radiation-induced conversions provide a key for their use as markers of the crystallization or transformation conditions in nature and during synthesis and modifying.