Pyrite's chemical formula is FeS2, meaning that it contains 1 atom of iron for every 2 atoms of sulfur. There is no oxygen in pyrite.

pyrite is a mineral consisting of 2 elements, so it doesn't have an atomic number. pyrite consists of iron and sulfur; FeS2 (Fe=1 Iron atom & S2= 2 Sulfur atom; these three atoms make a pyrite molecule).

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Pyrite is the mineral whereas a pyrite 'cube' happens to be the habit in which the mineral has crystallised

pyrite is made of FeS2

No. Pyrite is a compound composed of iron (a metal) and sulfur (a nonmetal).