Found in Scotts Valley, CA many years ago, I came across this piece. It was covered in Sandstone which I laboriously brushed and picked at for a few days. The pointy areas are sharp and brownish in color, symmetrical and extremely hard to pick at. Also the middle is brown, and the underside has a strange texture... It feels and sounds somewhat like porcelain. after brushing and picking the sides and the bottom you can see a thin brown (yet small) hard piece jutting out. My amateur instincts think it looks like a track of some sort, but hey I really won't be surprised if it turns out to be a concretion! Thanks for any ideas you can share... Also should I separate the top from the bottom?
Roberta