I know the image is not good enough, sorry for that, but then this was within a sediment core sample. The dimensions I can give - the length is 41µm and breadth 13.4µm at the longest and broadest. I am yet to find another of this to get a clearer LM figure and also go for SEM.
None to say yes, but I have the sediment with me and as you can understand it will take time to find another one that doesn't get embedded in Naphrax as the one above is.