I know others have asked what they are I just cant find the post about them. Anyways I was moving some rocks and I found it. Please let me know what it is and where I can find more info about it. I placed it in my sump for now untill I get a positive about it. Sorry the picture is not that clear I was holding the rock in one hand and taking the picture with the other. Thanks for helping me out and sorry to ask the same question for ID I know has been asked a million times.