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.
A more sophisticated lithophone trims and mounts individual stones to achieve a full-scale idiophone:
A stone marimba is a configured in the same manner as the more typical wooden bar marimba. The bars are usually wide like a wooden marimba, but are thinner and flat, which helps increase resonance. The stone marimba may or may not have resonators.