An American occurrence of miloschite¹

Introduction.–An earthy blue mineral resembling chrysocolla but stated to contain no copper was recently submitted to the U. S. National Museum by Mr. G. L. Sheldon of Ely, Nevada.² The locality was given as 6 miles north of Ely, and the occurrence as in a sort of vein, between walls of gossan. Preliminary examination confirmed the absence of copper, and showed that the color was due to the presence of chromium, and as the materiai did not correspond with any numbered species in Dana’s System of Mineralogy, it seemed worthy of further investigation. A sample was accordingly submitted by the Museum to Professor Brown, who has contributed the analytical data here given. The mineral proves to agree with the hitherto imperfectly known miloschite, which is here rescued from oblivion and shown to deserve recognition as a definite mineral species.