RT Journal Article SR Electronic T1 Contributions to the crystallization of willemite JF American Journal of Science JO Am J Sci FD American Journal of Science SP 305 OP 309 DO 10.2475/ajs.s3-47.280.305 VO s3-47 IS 280 A1 Samuel Lewis Penfield YR 1894 UL http://www.ajsonline.org/content/s3-47/280/305.abstract AB