u/AnimalCrackersss

I found these specimens recently that I had never seen before. They appear to be made out of a ceramic-like material? The three of them resemble different species of occlupanids. All of them have a glassy surface, and the reddish one has some sort of old scar. I don’t know if this is a different type of organism that’s mimicking the occlupanid shape, or just (unlikely) some sort of mutation that occurred separately in three different species. Any input would be appreciated!