I don't know the composition of this rock, but when struck with another rock, it made a very loud, metalic sound. It was used by the Masai for communication.
The copyright of the images presented here are owned by David R. Beebe & Patricia E. Beebe. It is illegal to reproduce them without the permission of the copyright owner. As with any image, your possession of a copy of a digitized image does not give you any rights to use it as you wish. Only the copyright owner, or the owner's legal agent, can give you permission to copy, distribute, or publicly display the image.