A mature rock tree stands about 13 meters (42 feet) in height, and had extremely hard and dense wood. It had long, slender, sword-shaped leaves of a particularly rich bright green which turned dark purple in the fall. It was also noted for its very straight trunk.
The brown rock tree was the most common species, named for its light-brown, rather rough bark. The next most common species was the yellow rock tree, named for the deep golden yellow natural color of its timber. Various species of rock tree could be found in almost every Sphinxian climate zone, although less commonly in mountain areas. (SK3)