Re: Charcoal look a like rock?
It is difficult to tell from the photos, but your rock appears to be shale. It should be fairly soft, and easy to scratch with the tip of a knife. Normally, it would smell like mud when wet, but after being in sea water I am not so sure about that.
The shape would result from tumbling in the surf.
From Don Peck - June 14, 2008 at 08:09:01