4th of July Rocks: Red, White, and Blue

Happy 4th of July, everyone! In honor of the 4th, here are some red, white, and blue rocks.
Red sandstone:

Red Standstone. Arches National Park, Utah, Fall 2005.

Newly-deposited white travertine:

Travertine forming in an alkaline pool. Oman, January 2009.

And, last but not least, brilliant bright blue kyanite crystals:

Blue kyanite. Image courtesy of Ian Stimpson's Flickr stream.