The best way is to make a simultaneous reduction/sulphidation of the metal oxide by a mixture of hydrogen and hydrogen sulfide at temperature of ca. 350-400 °C.

These can be precipitated with water-soluble metal salts with ammonium sulfide or sodium sulfide. This is the simples way. But there are numerous other methods as well.

However, FeS has different modifications. The synthetic methods depends on the type/modification/size range etc. of the required sulfide.

If your metal belong to the II. cation class (analytical class in qual.analysis) , you can precipitate them with H2S or with sulfides in acidic evironment, because these are not soluble in acids. If these belong to cation class III, these can be precipitated with ammonium or sodium sulfide in neutral /slightly alkaline medium.

The best way is to make a simultaneous reduction/sulphidation of the metal oxide by a mixture of hydrogen and hydrogen sulfide at temperature of ca. 350-400 °C.

You can use CBD. Number of publications from our group can be useful.