Well, welcome to BL. Just letting you know that I'm sure you will receive several replies telling you that you cannot ask for drug identification here. It would be advisable to read the forum rules. There's no way that anyone can tell you for sure what a drug is from a description like that!
But even more importantly, you should never take a drug that you have absolutely no idea what it is. Did your friend not know what it is was either? And on top of that you took it when "it seemed like a really dangerous drug"?? Why in the world would you do that?
This is a harm reduction site. Everyone is here to help. In the future I would recommend being worried about discovering the name of a drug, what it is, dosage and how dangerous it is BEFORE you even consider taking it. By the way, what exactly made you think it is very dangerous drug anyway?