Please help identify this rock!

[chica2021]

Hi, I'm very new to this forum and website so originally posted this in another forum and was suggested to post here instead (makes sense duh!) This rock I found at a lake across from where I live I think. It is 12.6 oz, very hard and seems magnetic, looks to have a seam all the way around it and I could not crack it open do not have proper tools. Wondering if it could be a geode? Please help identify it if you can, Thanks so much!

 

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[Ponchosportal]

Appears to me to be a poorly formed concretion or segregation; not likely hollow. Sandstone? Just an opinion/guess from your photos.

 

[IAMZIM]

It could be limestone, which could have iron concretions that might make it slightly magnetic? It definitely looks like sedimentary rock of some sort.....

 

[Eu_citzen]

Would need to break it open to be sure. Could also be a very well worn/weathered greenstone (metamorphic mafic rock).

 

[usagold]

Appears to be a Leaverite from the picture.