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I have a coprolite that is 8" by 5" and weighs 8 lbs. The shape is similar to a lumpy brain, the colors below outer crust are deep red and the crust is pastel green and grey. It has a strong density and can't be chipped with a hammer. It came from the Grand Canyon.

Here are some pics:

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If it is a predator's coprolite you should expect to see bone fragments. Coprolites from herbivores? I would expect them to be pretty rare as there is almost nothing likely to fossilize. As for meteorites, they come in many forms: stones, irons, palasites, chondrites. The candidates need a good description. A weathered heat ablation surface is the most obvious characteristic to look for. In all cases the rock identification is best achieved with a polarizing microscope, unless it is something very obvious like an iron meteorite.

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