# Making elemental sulfur from pyrite FeS2

Has anyone done this or know of a good experiment that would allow someone to make elemental sulfur from $\ce{FeS2}$ (iron pyrite)?

• Please be aware that there's potential danger to liberate $\ce{H2S}$ which is highly toxic and at higher concetration has surprisingly pleasant smell. Also note that you can very quickly lose olfactory trace of it even though it is still present. I'm not trying to preach sermons here, but speaking from experience of a friend of mine who underestimate this danger and ended up in hospital severely intoxificated. – wuschi Oct 17 '15 at 18:14

$$\ce{FeS2 ->[\Delta] FeS + S}$$
Thermal decomposition of pyrite into $\ce{FeS}$ (iron(II) sulfide) and elemental sulfur starts at 540 °C.