Answer:
cats and deflation tires make this noise.
I fly forever Rest never.
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
In my life I must bare, my bloodline I must share. What am I?
I am a precious stone as clear as diamond. Seek me out while the sun's near the horizon. Though you can walk on water with my power try to keep me and I'll vanish in an hour.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.