I have dug out some of my photographs from back in 2003 when I went to Sedona in America and scanned a few of them. I am not sure what this rock formation was called, but there are many like this across Sedona and have magnetic vortex type properties. On a sunny day they are bright red, but when it becomes cloudy they look very plain. You will have seen formations likes this in the American Cowboys and Indian films.
All the best