Yeah, we call this "'taking a walk". Literally everything can do it. >>55091 is right.
I once threw a piece of calcite towards a frozen lake, intending to break the ice and leave the stone underwater. The stone vanished in midair. Right before my very eyes, one moment it was there, the next it was just gone. Broad daylight, too; the thing was substantially sized, it would've made a sound when it hit even if my eyes failed to track it, it would've been obvious where it landed. Just disappeared.
So uh… If anyone here is ever hit by a piece of green calcite a bit larger than a tennis ball, I'm sorry. I only somewhat understood what I was doing at the time.