RT Journal Article SR Electronic T1 Contributions to mineralogy; 50 JF American Journal of Science JO Am J Sci FD American Journal of Science SP 394 OP 400 DO 10.2475/ajs.s3-41.245.394 VO s3-41 IS 245 A1 F. A. Genth YR 1891 UL http://www.ajsonline.org/content/s3-41/245/394.abstract AB