RT Journal Article SR Electronic T1 On willemite and tephroite JF American Journal of Science JO Am J Sci FD American Journal of Science SP 230 OP 232 DO 10.2475/ajs.s2-46.137.230 VO s2-46 IS 137 A1 William G. Mixter YR 1868 UL http://www.ajsonline.org/content/s2-46/137/230.abstract AB