Can some identify this geode? It was found in upstate New York in a flat sandy plain 1/4 away from the Hudson River. The geode is approximately 3" long, brown exterior, 1/4" "shell" gray , and 1 1/2" center made of what appears to be a dense mineral.
It is a uniform rock,possibly granite and it have been cut in half by an angle grinder.
the shape of the rock suggests it have been shaped by water in a river or on a beach.