Fools gold - Iron Pyrite, is so called, because you are a fool to try to get the gold out of it.
Fools gold does get its color form gold. But basically, it is one atom of gold in a big box of iron and sulpher. There is also Iron Pyrite that is silver in color, because it has a silver atom at its center.
But, if you are melting the iron pyrite for the iron, the first pour from the furnace (that contains the heaviest elements) is much higher in gold content.
yeas, there was many kind of pyrite color, silver color, gold color, yellow-green. we can use the pyriteto show the gold existence , because both them form together in a rock.