This is a piece of a type of basaltic lava flow known by the Hawaiian word "pāhoehoe" (pronounced "pah-hoy-hoy"). Basalt is the most common type of volcanic rock. A pāhoehoe flow is distinguished by its smooth, hummocky, or ropy surface, and is a result of gas-poor magma. The specimen measures 16.5 cm x 15 cm x 5 cm.