Pyrrhotite:
Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0.2). The FeS endmember is known as troilite.
en.wikipedia.org
磁黃鐵礦:
磁黄铁矿的成分为Fe1-xS ，其中x为0.1 - 0.2，硫的含量为39%-40%，有时也含有微量的铜、镍和钴。
zh.wikipedia.org
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Pyrrhotite磁黃鐵礦