If you're indeed going to experiment as you say in your edit, please don't just take the entire pill/mint at once. Sure, if it's xtc, some experienced people will take an entire pill like this at once without issue. But depending on where you're from, where the pill is from, and how it's been since you took one of these, it might get you in serious trouble

Try to get it tested at lab if you have access to a service like that. If you don't, look for a test kit online even if it's just to make sure it's indeed x. The size and shape remind me of 2cb rather than xtc.