gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1957.31.239.01 Rhodesite, a New Mineral from the Bultfontein Mine, Kimberley Mountain E. D. M.A., D.Sc. Professor of Geology, Rhodes University, Grahamstown, South Africa. 12 1957 31 239 607 610 Copyright © 1957, The Mineralogical Society 1957 Summary

A small specimen at first thought to be natrolite has proved to be a new mineral, for which the name rhodesite is proposed; it is fibrous, with α 1·502, β 1·506, γ 1·515, elongation γ, extinction straight, sp. gr. 2·36. The composition is near 4(Ca,Na2,K2)O. 10SiO2. 7H2O, and the water is all zeolitic.