Oxford clay - enamel - tooth or scale?

[Ossicle]

Jurassic, Callovian, Oxford Clay, Peterborough Member 

 

This has enamel, and is the colour I associate with fish remains. Enamel made me think dentition or scale of some kind, but I'm puzzled by the shape.

 

It has a couple of prominent tubercles, which made me think teeth or scale. Any pointers would be greatly appreciated.

 

Edited May 18, 2022 by Ossicle
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[abyssunder]

I'm not sure what it could be, but maybe it's a part of a crab? 

[JamieLynn]

that's my thought....crab part

[Ossicle]

Thank you both, I hadn't considered crab, I think I was distracted by the colour. I will try and work out which decapod part this might be. 

[Carl]

I'm thinking this might actually be a bit of coal slag. I'm not seeing a fossil there.

[Ossicle]

I hadn't considered that, it would be shiny, and although I haven't seen any more at the site, I think it's perfectly likely there would have been some there.

 

I've tried to photograph it again in more natural light (me sat by a window) and side on, it's definitely brown, but I think slag can be. 

[val horn]

it does look slag like in natural light particularly on the one side,    still it might be interesting to try to clean it a bit to look for to if the crab like pieces will separate out.