Spotting

Thanks for your informations morlacoral, so this will be a Unknown spotting forever :-) (maybe i found something new ;-) )

Its not even as easy as using a microscope, you have to first dissolve the tissue away in nitric acid to extract the spicule, then you identify that under the microscope! very difficult,

Thanks Degudame and Elsa for trying to help and sorry, i didnt had a microscope with me ;-)

Definitely sponges :) And unfortunately notoriously difficult to ID without a microscope.. Any experts?

i think this are some kinds of spong.

But anyway, nice foto