Περιβάλλον γένεσης:
Volcanic exhalations and bacterial reduction of sulfates in sediments.Usually formed from volcanic action - as a sublimate from volcanic gasses associated with realgar, cinnabar and other minerals. It is also found in some vein deposits and as an alteration product of sulphide minerals. It can also be formed biogenically - a major source being salt doems, where it has formed by the bacterial decomposition of calcium sulfate.
Περιγραφή:
Volcanic exhalations and bacterial reduction of sulfates in sediments.Usually formed from volcanic action - as a sublimate from volcanic gasses associated with realgar, cinnabar and other minerals. It is also found in some vein deposits and as an alteration product of sulphide minerals. It can also be formed biogenically - a major source being salt doems, where it has formed by the bacterial decomposition of calcium sulfate.