Plaqionite, Heteromorphite and Semseyite as Members of a Natural Group of Minerals

L. J. Spencer and G. T. Prior

Assistants in the Mineral Department of the British Museum

Mineralogical Magazine; April 1899 v. 12; no. 55; p. 55-68; DOI: 10.1180/minmag.1899.012.55.02
© 1899, The Mineralogical Society
Mineralogical Society (www.minersoc.org)