Grad. Sch. of Oceanogrpahy, University of Rhode Island, Narragansett, RI 02882, United States
Department of Mineral Sciences, Smithsonian Inst., Washington, DC 20013, United States
Department of Mineral Sciences, Smithsonian Inst., Washington, DC 20013, United States ; Northwestern Univ., 633 Clark St., Evanston, IL 60208, United States