RT Journal Article SR Electronic T1 Newtonite and rectorite; two new minerals of the kaolinite group JF American Journal of Science JO Am J Sci FD American Journal of Science SP 11 OP 21 DO 10.2475/ajs.s3-42.247.11 VO s3-42 IS 247 A1 Brackett, Richard Newman A1 Williams, J. F. YR 1891 UL http://www.ajsonline.org/content/s3-42/247/11.abstract AB