An iron sulphoxylane found in carbonate-hosted Zn-Pb deposits of Poland and Belgium.
One of a few mixed/intermediate valence compounds of such deposits, by subsulphites (seeUnnamed (Fe Subsulphite)), sulphites (Unnamed (Fe Sulphite),Unnamed (Zn Sulphite)), pyrosulphites (Unnamed (Fe Pyrosulphite)) and thiosulphates (compare'UM1995-34-SO:Fe' andUnnamed (Fe Thiosulphate II)). These compounds are generally banded/radial/fibrous/spherulitic in form and have lowered reflectivity with growing sulphur valence.

The sulphoxylane forms bands up to 40 microns thick, grading into Fe-bearinggalena withgoethite inclusions. It has significant admixtures of As, Zn and Pb. Compare alsoUnnamed (Fe Oxysulphide).

This is likely the only known sulphoxylane mineral.

Comparealbertiniite (an approved Fe sulphite mineral).