ferrous sulfide

noun Chemistry.
a dark or black metallic crystalline compound, FeS, insoluble in water, soluble in acids, used in ceramics and to generate hydrogen sulfide.
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Example sentences
Ferrous sulfide itself is also a relatively insoluble compound.
Hydrogen sulfide in the gas reacted with the fer- rous sulfate to form ferrous
  sulfide.
Copper in the slag tends to revert to the matte phase by interaction with
  ferrous sulfide in the matte.
Pyrites are various ferrous sulfide minerals that are mined for their sulfur
  content.
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