Heat is needed. Component composition is important. component colour and product colour is not similar. The process is almost impossible to reverse. The change is chemical. The properties of the component and the product is not similar.
colour is different and so is some others
A new substance is formed with different properties from iron and sulphur.
Iron and sulphur make iron sulphide
Iron(II) sulphide: FeS. Iron sulphide is a synonym, but the first expression is more correct. Iron(III) sulphide: Fe2S3. Other forms of natural iron sulphides are known: see the link below.
The two possible formulaunits for Iron Sulfide are; FeS, and Fe1S1
iron sulphide is FeS while rust is oxide of iron Fe2O3.
Earth's physical properties are:Water,Dust,Rock,Air,and Iron
iron sulphide, iron(II) sulphide or ferrous sulphide. Iron sulphide is ambiguous however and could refer to any one of a range of iron sulphur compounds,including Fe3S4 and Fe2S3
See the Web Links for "Venderkrogt.net: Antimony" to the bottom for the answer.
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it is iron
Iron Sulphide