prehistoric fossil For Sale

I found this in my yard while clearing some trees. I also found 2 other small pieces I believe go with it. It probably weighs around 20to 25 lbs u can shine a light though it and the light illuminate through it a greenish/ bluish color. I don\'t know what it\'s wortg but the first person offer me something decent for it, it\'s theirs. also I did a Google image search of it and Google said it was a prehistoric rhinoceros skull.