Answer:
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.
I am commonly abbreviated to H
My first though water cures no thirst my next alone has soul and when he lives upon my first he then is called my whole.
Tear me off and scratch my head, what once was red is black instead. What am I?
My first two letters say my name. My last letter asks a question. What I embrace I destroy.
A man goes out in heavy rain with nothing to protect him from it. His hair doesn't get wet. How does he do that?