Coprolite? Coral?

[DemonCatSpaceStar]

Hello,i found this interesting "rock" on the river, & when I picked it up I noticed it was VERY heavy for its size (4.99lbs). Every person Ive shown to comments on how heavy it is.

At first I thought it might be coral, but then after looking at pics of different coprolite it has certain similarities?The first pics is of it wet.

What do you think?

Thanks in advance,

 

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[Planko]

Well, I am 99% sure it is not poo. Still out on coral though.