I asked this question about what a strangelet would look like to the naked eye, and it was closed because it needed details or clarity. As far as I can tell, there was no need for either, because it was a simple question. Was there something I failed to elaborate on simply because I didn't know about it?
Comment from ACM for if the OP is asking about the technical term strange matter
I'll note that even if one guesses that the question is about strange matter in the technical sense, that still doesn't tell us enough because "non-strange matter" also has extremely varied appearance depending on its actual atomic/molecular structure.
And if not...
Suppose we've found a piece of strange matter and have found a way to contain it so that we can examine it safely.
The premise is really unclear. The only thing we know here is that the matter is "strange" and we can examine it. Being "strange" is a very unclear and subjective term. Certainly this is not enough information to know what we are actually looking at here.
How would it appear to the naked eye? Would it be a perfect black body? A perfect mirror? Completely transparent? Something weirder?
How would anyone be able to answer any of this? All we know is that this is "strange". How is there any way to conclude this would be anything at all? What is "something weirder"? Weirder than what?
This question makes no sense, and there is no way to give a definite answer.