You may be wondering that there's no such thing as slime that is crystallized. And this is what you'd be saying to me: "Oh, my god, you're such a liar! I wouldn't even want to go to your house and have a playdate with you."
Slime crystal is actually a real thing. If you put it in water, then partially dry it off, then rub the water that is left on the crystal as hard as you can, then you slime yourself! It feels like the slime is like crystallized, but it's not strong enough to be against water.
The slime crystal is always green, and it's not polygon shaped. So if you want to call about geology, then call me.