UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 1, pp. 1-20, pis. 1-2 Issued May 17, 1912 



THE MINERALS OF TONOPAH, NEVADA 



BY 



ARTHUE S. EAKLE 



CONTENTS 



PAGE 



Genesis of the minerals 1 



Origin of the deposits 2 



Oxidation of the veins 2 



Origin of the silver haloids - 3 



The hydrous secondary minerals - 6 



Description of the minerals 7 



Native Elements: Gold and Silver 7 



Sulphides: Argentite, Galena, Cinnabar, Pyrite, Chalcopyrite, and 



Sphalerite - 7 



Sulphantimonites: Polybasite, Stephanite, Pyrargyrite, and Tetra- 



hedrite 8 



Haloids: Cerargerite, Embolite, and Iodyrite 9 



Oxides: Quartz, Opal, Cuprite, Hematite, Limonite, Manganite, 



Pyrolusite, Psilomelane, and Wad 13 



Carbonates: Calcite, Manganocalcite, Rhodochrosite, Malachite, 



and Azurite 14 



Silicates: Feldspar, Kaolinite, Sericite, and Rhodonite 15 



Phosphates and Arsenates: Apatite, Pseudomalachite, Wavellite, 



Turquois, Pharmacosiderite, and Caeoxenite 16 



Sulphates: Gypsum, Jarosite, and Barite 17 



Tungstate and Molybdate: Hiibnerite, or Wolframite, and Wulfenite.... 18 



GENESIS OP THE MINERALS 



Some of the minerals occurring with the silver deposit at 

 Tonapah were mentioned by Spurr 1 in his paper on the geology 

 of the district) and by Burgess 2 in his discussion of the origin of 



1 Spurr, J. E., Geology of the Tonopah Mining District, Nevada, U .S. 

 Geol. Surv., Prof, paper no. 42, 1903. 



2 Burgess, J. A., The Halogen Salts of Silver and Associated Minerals 

 at Tonopah, Nevada, Econ. Geol., vol. 6, p. 13, 1911. 



