Answer:
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
When I am caught I am thrown away. When I escape you itch all day.
I am gentle enough to soothe your skin light enough to fly in the sky and strong enough to crack rocks.
What jumps when it walks, but sits when it stands?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
I build up castles. I tear down mountains. I make some men blind. I help others to see.