Certainly it's worth something, at least 10 cents. But aside from that, it's hard to say without actually seeing your coin.
If it's the same thickness as a normal dime it's a good bet that it's been exposed to heat or some chemical that changed its color. In that case it's still only worth a dime.
If it's thinner than a normal dime you may have a "lamination error". That occurs when the outer cladding comes off one (or both) sides of the "sandwich" metal from which it was struck, leaving the inner copper core visible. This is a collectible item that can retail for $8 or $10 in that denomination.
However the only way to be sure would be to have your coin examined in person by someone who is knowledgeable about such errors.
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