Rhodesite, a new mineral from the Bultfontein mine, Kimberley

Abstract

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,Na 2 ,K 2 )O. 10SiO 2 . 7H 2 O, and the water is all zeolitic.