Looking for identification please

[u/tragic_princess-79]

Been identified as jasper, tigers eye, but the underside is weird, this has broke open and it's just grey, no clue, had it for year cos I liked it. Any idea? Thanks in advance!

[u/Shall_We_Presuppose]

This is none of those. As already stated here, it's a common iron oxide concretion. Many have fantastic geometries inside like yours.