Answer:
I am a mother from a family of eight. Spins around all day despite my weight. Had a ninth sibling before founding out it's fake.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
It's been around for millions of years but is never more than a month old. What is it?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.