Rock? Meteorite?

[Dorito]

Hi. I found this on a rocky marine shoreline and am not sure what I have. My first thought was it was a chunk of rusted metal. It feels slightly heavier than a rock of it's size. I come to find out it is non magnetic. Not to sure what type of rock it could me. Looks a little extraterrestrial if you ask me.

Thanks.

Joe

 

[metrotec]

most are magnetic smooth one on side , rough on other
I'm not an expert, just saying that's the waymost we've found