Lithophone
A lithophone is a musical instrument consisting of a rock or pieces of rock which are struck to produce musical notes. Notes may be sounded in combination (producing harmony) or in succession (melody). The lithophone is an idiophone similar to the bars on instruments such as the glockenspiel, metallophone, xylophone and marimba.
In the Hornbostel-Sachs classification system, lithophones are designated as '111.22' – directly-struck percussion plaques.
Notable examples
A rudimentary form of lithophone is the "rock gong", usually a natural rock formation opportunistically adapted to produce musical tones, such as that on Mfangano Island, in Lake Victoria, Kenya. The Great Stalacpipe Organ of Luray Caverns, Virginia, USA uses 37 stalactites to produce the Western scale. Another stalactite lithophone is to be found at Tenkasi in South India. Ringing Rocks Park in Pennsylvania is another well known lithophone.
A typical Basque (Spain) instrument named Txalaparta (or Chalaparta) can be made of wood or stone, but is traditionally made of wood