Hmm I think you answered my question with that last part. I’m not used to thinking about crystals made of proteins, so maybe my question about composition doesn’t even apply.

Here’s my thought process: minerals such as pyrite and marcasite are polymorphs of one another. This means they have the same composition (Fe-sulfide), but different crystalline structures. The difference in structure, caused by differences in growth conditions, distinguish the two as unique minerals.

When I saw your crystals, I thought, “maybe those proteins are polymorphs?” I’m not sure if polymorphs is even the right word to use tho 😅.

Thanks for the reply, interesting stuff!