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rock needs ID
Posted by craig johnson
Craig, from what I can see in the photo, I would go with sedimentary. The particles appear to be quite mixed in size and it looks like the rock broke around particles and not through them (although a real close-up would help determine that). There is a slight indication of what could be foliation at the top, but I think it is an artifact.
Hi, The rock might be a calcite cemented clastic sedimentary rock, such as sandstone. I'd try scratching a piece of glass with it. It it scratches glass, it's probably calcite cemented sandstone. It might also be a calcarenite--essentially a calcite sandstone. In either case, it looks sedimentary to me.