I do apologize if this is the wrong place to ask this question. It's a rather simple question, but google gave me rather vague / random results, so I thought it might be better to ask somewhere like this place, where someone could give me a more solid answer
My question is, which mineral, regardless of its nature (mined / lab made) has the highest index of refraction.
I've heard there are ones higher than moissanite, which already has an excessively high IOR (nω=2.654 nε=2.967), but I wanted to know if there were any materials higher than that?
For those curious as to why, I just wanted to find the highest refractive material to look at. I collect rare stones and minerals, and the higher the IOR, generally the prettier the faceted stones look in the end.