Behavior of Sulfur by the Example of Iron Balls from Regolith Samples from Luna-24 (Mare Crisium)

Studies of lunar regolith delivered to Earth by the Soviet automatic station (AS) Luna-24 using highly local electron microscopy methods made it possible to obtain data confirming the migration of sulfur during cooling of metal melts during the process of liquation. As a result, local Fe-S concentrates are formed, and part of the sulfur is displaced outward, forming sulfur shells on the surface of the melt droplets. Their formation on the surface is associated with the evaporation-condensation process during the cooling process of iron balls. The resulting sulfur coatings can be preserved if they are preserved in glass or under thin films of silicate condensate.