It was not expensive, but after searching that, it does look like it could be a really low-grade sample. I'll have it looked at by a professional eventually. If I get an answer, I will try to remember to let you know if you were right. :)
Discussion
Could be tourmaline but doesnt quite look right. 🤷♂️
Yeah, I'm somewhat familiar with tourmaline and it's definitely not as dark as I have seen. Much more metallic. It looks a lot like carborundum but it doesn't have any iridescence.
So many varieties. Be curious to know if you do get it identified. Just to know if I actually still have a little kniwledge as a geologist!
Well, I had a geologist friend look at that piece. He's leaning the same as you but can't clearly identify it without proper tests and I am not curious enough to pursue it any further. I just want to incorporate it into some artsy thing. I did get a nice lecture about not asking the guy who sold it to me. So that was fun. 😅
It took me a long time to get a straight answer on this... but it's black kyanite.