After some research, I located three other similar artifacts from the Trowbridge, KS, Ohio Hopewell Culture sphere site located in suburban Kansas City. The significant noted difference is the blue example featured here has two holes drilled from the base toward the top of cone, as if to be attached to a cord or something. None of the Trowbridge artifacts has been drilled.
Trowbridge site, Kansas City, KS (14WY1)
Link to other Trowbridge artifact photos