What is this ?

[GroundS.KeepeR]

Found this two years ago , while looking for artifacts..any idea what this May be... Thanks

 

[woof!]

Looks like a cemented breccia, the cement in question most likely calcite that has been eroded by some combination of mechanical abrasion and/or leaching by carbonic acid.

 

[Eu_citzen]

Clean it off with a brush and some water. Let it soak if need to be. I do think I see some crystals in there - perhaps pyrite.

 

[GroundS.KeepeR]

Yes the little red squares i do believe are crystles ..they look to be anyways...