I'm going through bags and containers of coins that have been sitting around our house. I did find a 1945 War Nickel and a 1943 British half penny, which I will likely need help figuring out, but I also found 2 odd colored coins and could use a little help. One is a dime that looks like it's from 2006 and the other is a Sacagawea dollar. Both are brown. The dime is dark brown on one side and looks platinum on the other. The dollar coin is almost the collar of a penny. It could be nothing, but am curious and could use a little help. I'm wondering if there is these are errors.