(First of all I'm new here so please go easy on me) I have not seen anything like this, it has the shine of a penny unlike other brown quarters I've seen, with a little bit of a golden shine on the back. Can anyone help? Updated: Heres a more accurate picture
If your coin doesn't have a golden hue to it like your photo, you need to adjust the White Balance on your camera. The photo should look something like this.... Chris
this is very accurate to what you see with the naked eye, it is actually quite shiny, more than you can get with a still image oh yes the hue is why I posted it appears to be very golden brown
I think the black beauties are only nickels. As for your quarter, usually it's an environmental factor. Perhaps it was in the ground. Water, air, soil, chemicals, elements and pollutants will easily react with the coin and give it a variety of hues.