fossil or rock ?

[Muddywaters]

Hello fossil community muddy here. I'm an avid lake superior agate hunter living in south east Minnesota. on occasion I come across some 'finds' that stump myself, and it would be greatly appreciated if you'all could possibly educate me on these 'finds'.
this first one I found a couple years back, but I'm not to sure it'd agate, or stone, or some fossil.
dimensions: 6.25" long 4.25 to 2" wide and 1 3/4" to 1" thick. 3.1lbs
it's been cleaned with nearly everything under the sun but has only lightened slightly since found.
Any suggestions or questions of course are always welcome.
appreciated Muddywaters.

 

Amazon Forum Fav 👍

A History of Mining on the Kenai Peninsula, Alaska - Grab it through Amazon!

[Muddywaters]

 

[Muddywaters]

 

[Ohiogoldfever]

Man. I haven’t a clue but it’s pretty crazy looking. My first inclination would be it’s just a rock but I wouldn’t be able to begin to explain a geological process that created that. Looking forward to see what some weigh in on this.

 

[Muddywaters]

my first thought was agate in host rock, but I would think the 'agate ' part would clear up and stand out more. which hasn't been the case.
anther though is skip an atom agate in a host stone, which would be the only one known as for as I know lol.
I seen this forum and though maybe it's a fossil or something and I could mail it off to one you guys