Two valves forming one complete saltwater clam. The valves are thick, sub-ovate or triangular shells are dark gray to a reddish-tan in color on the exteriors. Growth lines are also visible on the exteriors. The interiors of the shells are an iridescent white with matching purple to violet on one margin of each valve. The ventral margin is wide and there are visible muscle scars. Three cardinal teeth are present in each valve.