This sculpture represents an evil water spirit, Yingatabandu, and is sculpted by artist Jo Wakund.
Material: PumiceLocation: Mono Lake on the California/Nevada BorderHow Do I Know?: The rock is relatively light colored and is filled with small vesicles (spaces created by gas bubbles). It is much less dense than the other rocks.Formation: As felsic, silica-rich magma rises to the surface, becoming lava, and the pressure exerted onto the magma by the weight of the earth around it is suddenly released, the gases, mostly carbon dioxide, that were kept in their liquid form in the magma suddenly evaporates into gas. As the gas bubbles through the cooling lava at the surface, vesicles are formed.
Bay Area Earth Science 