There are 11 rock textures and 1 bonus wood texture in this package. They are different sizes, but are generally 400 pixel resolution, and usually 300 - 800 pixels wide by 300 - 800 tall. They are all 32 bit color. They are all scans of real rocks, so they will need to be edited if they are used for tiling. The picture I used as a preview is a 4 texture sample, all textures are individual jpeg formatted files. They also tile very well, and as you can see they bump map well too.

Please view the enclosed reame file.