The items are a stone mortar and a stone pestle. The round mortar is a light, cream-speckled color stone, while the pestle is a gray speckled color. The bottom interior of the mortar has stains from use. Both objects are sandstone. The most common colors of sandstone are tan, brown, yellow, red, grey, pink, white and black. The lighter sandstone color is found in Northern California; the darker grey sandstone color is found in Southern California. I believe the mortar is of the Yokut Native American tribe of Northern California. The pestle is of the Chumash tribe of Southern California. DateCirca Early 19th Century.Height7.25Length3Extra NotesThe mortar and pestle are a set of tools that have been around for centuries. Traditionally, the mortar and pestle were used in both food and medical applications, for grinding grain, spices, or medicines. The Mocajete was used by pre-Historic Mesoamerican cultures that include the Aztecs and Mayans. Native American tribes used mortars carved into bedrock in order to grind their acorns and other nuts. The design of the mortar and pestle has changed a little over the past several millennia, especially the materials used - glass, ceramic, wood and stone