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I found this piece at [Battery-point, Portishead, UK][1], at a site for fossil hunting.

It is smooth one side and porous on the other. It also has one side with beautiful colours shining on the surface.

I’ve attempted to take pics which show it but if I’ve missed something please ask. It’s hard material, and I’ve not washed it properly but each time I give it a quick clean more colour shows. Added some pictures in better light

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[1]: https://www.google.es/maps/place/Battery+Point+Lighthouse,+Esplanade+Rd,+Bristol+BS20+7HD,+Reino+Unido/@51.4946025,-2.7757852,17z/data=!3m1!4b1!4m5!3m4!1s0x4871eded3af88fef:0xaf3334bfcd2dc9db!8m2!3d51.4946025!4d-2.7735965!enter image description hereenter image description hereenter image description here

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closed as off-topic by trond hansen, Ash, user12525, Fred, gansub Aug 10 at 9:34

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  • "Questions about rock identification requests are off-topic. For more information, see the announcement on meta." – trond hansen, Ash, Community, Fred, gansub
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ it could be a fossil fragment, or it could be a normal rock, just based on a few pics it is difficult to tell, although I would lean towards fossil, please refer to the how to ask identification questions. Are the smooth area solid while the broken areas porous, that is often a good indicator. What it is a fossil of will be based more on the rock it came out of as there is not enough for any real morphological identification. earthscience.meta.stackexchange.com/questions/124/… $\endgroup$ – John Jul 29 '18 at 3:32
  • $\begingroup$ I would say it looks like a fossil, and I think that guide doesn't help a lot for paleontology issues, unless issues about pictures and location, wich is partialy provided. That river is the longest river at uk. @Sara Tudor: can you provide a precise location? More pictures may help. Picture 1 looks to me a biological form. It can have been deformed by some metamorphic proccess, common at uk. $\endgroup$ – user12525 Jul 29 '18 at 11:25
  • $\begingroup$ I will attempt to put more photos on later if it helps. $\endgroup$ – Sara Tudor Jul 29 '18 at 15:26
  • $\begingroup$ "Portishead is an interesting location with both Carboniferous and Devonian rocks. At Battery Point, many corals and crinoids can be collected from the rocks..." ukfossils.co.uk/tag/battery-point That looks to me a rudist Sara. At Paleozoic rudists used to be the main components of coral reefs, but It could be some other kind of bivalve/oyster too. Maybe you can try to give us pictures from other points of view of the piece. I asume this is an 'in situ' and not transported fossil with the location provided, but I realized point 3 of the guide matters for fossils. Surely @John agree. $\endgroup$ – user12525 Jul 31 '18 at 7:37
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    $\begingroup$ Universal_learner, I’ve added a few more photos in hope it helps. It really is beautiful $\endgroup$ – Sara Tudor Aug 2 '18 at 21:58
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No it is glass slag or sea glass. The fracture pattern and luster are more consistent with glass, the speckling is common in glass slag. The added colors are caused by impurities. A google search for "black glass slag" with show you hundreds of examples. Fossils do not form shiny smooth breaks, the pitted surface is just weathering. picture 6,7,and 8 make it very obvious. If you back-light thin parts it should be translucent.

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  • $\begingroup$ Thanks. I’ve added a couple of pics in better light $\endgroup$ – Sara Tudor Aug 5 '18 at 11:53
  • $\begingroup$ @Sara Tudor. it was though! :) first picture and the location made me thing on a bivalve. I think you can mark this answer as the correct -by clikinkg on the tic left top of the answer- as you told us it was sugested to be a glass by someone of your partners too $\endgroup$ – user12525 Aug 7 '18 at 9:15

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