A

Gold has the chemical symbol Au, and it is heavier and softer than a lot of other metals. It is considered a "noble" metal because it does not corrode or otherwise react with other elements easily. Other materials may be similar in color such as brass or fool's gold. Fool's gold is iron pyrite, a crystalline substance of iron and sulphur. This sulfide of iron has the chemical formula FeS2 and is a brittle solid, where gold is soft. A small piece of fool's gold will break apart into many pieces if tapped with a hammer or like object. A small gold nugget will flatten slightly but will not break apart. Real gold is soft, and the pressure of a thumbnail will make a small indentation in it. See the field test that follows.

Field Test

Prospectors had a pretty simple test to determine if what they had found was the real stuff or fool's gold. Real gold is extremely malleable, unlike the crystals of fool's gold. If they could put a small indentation in a piece of gold with their fingernail, it was the real thing.

Source: http://wiki.answers.com/Q/What_is_the_difference_between_real_gold_and_fool%27s_gold

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