Another question guys. These two stones are part of my collection found on the beach. The grey one looks like skin or fish scales, it's lovely. This was found on a beach in wales where I've found lots of fossils, so is this one a fossil? Or just a pretty stone. The yellow/cream one was found the summer at the beach in south England among the pebbles. It's quite soft in places and crumbles if you scratch it. Any help would be great. Thanks again :-))
1-4. bioclastic limestone, with what may be veins of calcite or a larger fragment of shell
5. a pebble of limestone comprising mainly part of a coral colony (will look nicer when wet or varnished)
Your bottom two images of a pebble are of a colony of colonial corals probably Lithostroton sp, I don't think that's how you spell it but I am not far off!
I hope you do not mind but i have attached an image of a colonial coral that I found a long time ago that I polished up.
It would have also looked nice wet or varnished as Mike suggested.