I'm not a rock guy, though I do have a piece of gravel embedded in my right thigh from a bicycle accident on a gravel road when I was 10 or 12.
But that's a very nice looking whatever it is!
Welcome to TreasureNet. Of note though - you shouldn't have used your e-mail addy as your user name. Not all viewers of this forum are stand up individuals - the majority of actual members are. I think you can get your username changed, but you'd have to ask the moderators.