Keilite is an iron-magnesium sulfide mineral with the chemical formula (Fe,Mg)S) that is found in enstatite chondrites.
[3] Examples of keilite occurrences are enstatite chondrites and the Zakłodzie meteorite.
[4] It appears to be confined to impact-melt influenced enstatite chondrites that were quenched.
There are also some meteorites interpreted as impact-melt breccias that do not contain keilite.
This is explained as a deeper burial after impact, which slowed cooling and enabled retrograde reactions (diapthoresis) to take place.