Don't count on me, If you slip on the soap, I will let you down, Just give up hope

I am a tiny slice, so thin and slight, a narrow shard that catches light. Not whole, not much, just barely there, a little piece of something rare.

I am a word made up of two words, yet they are unrelated to my meaning A world where you have freedom to explore and interact I am a game with no defined goal, and the decision is yours to decide

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I’m torn from a mountain but fit in your palm, I don’t bend or bruise, I stay solid and calm. I skip on the water, I grind into sand, Found on the shore or deep in the land. What am I?