Serpentinite clasts were recovered from cores of serpentine mud from South Chamorro Seamount in the Mariana Trench region during Ocean Drilling Program (ODP) Leg 195. South Chamorro Seamount is one of many serpentine mud volcanoes located between the Mariana and Izu-Bonin forearc basins and the inner slope of the trenches. These serpentine mud volcanoes form when water from the subducted Pacific plate interacts with the mantle rock in the subduction zone beneath the Philippine plate to form serpentinite. Because serpentinite is less dense than the surrounding mantle and ocean crust rocks, it will rise to the surface if a pathway is present. Faulting and seismicity in the forearc basins provide this pathway. The seismicity grinds the serpentinites into breccia that rises with excess fluids from the Benioff Zone to the surface through the forearc faults. This "mud" forms the serpentine mud volcanoes (Fryer et al., 2000). The clasts tested in this study were included in the serpentine mud. Similar to Ballotti et al. (1992), the purpose of this study is to examine the compressional and shear wave velocity and density ranges of clasts from the serpentine mud volcanoes. These data can then be used to estimate percent serpentinization of the mantle rock at depth if seismic velocities are available.