Activity Jack G posted an image in the group Bookworms from the myFOSSIL app 4 months ago 4 months ago 4 months ago Can anyone tell me what this is ? I have another photo. Has herkimer diamonds in it. Not sure if this is a fossil or what type of rock . Picture 1 #fossil Sam Ocon replied 4 months ago This appears to be a rock, @Jack-G.