What is it man made or natural?

[Unitedstatesofamerica1]

 

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[Geochem]

Good question.

From the pictures it looks like a piece of diorite - a multi-mineral of courser grain-size igneous (origin) rock - meaning having significant hardness compared to sandstone, etc. If diorite, it would be a challenge to square sides into a brick-like shape. So I'm calling it natural by first pictures composition interpretation.

 

[rick67]

Looks like a cobble stone to me.
Jumbo size.

 

[A2coins]

make sure its not a gold bar covered in crustation

 

[ecmjamsit]

Or made by space aliens?