BULLETIN OF THE UNIVERSITY OF WISCONSIN 

 Science Series, Vol 1, No. 4-, pp. 109-156, Pls. 4— 8, June, 1895 



A CONTRIBUTION TO THE MINERALOGY OF 



WISCONSIN.' 



BY WILLIAM HERBERT HOBBS, 

 Assistant Professor of Mineralogy and Petrology. 



CONTENTS. 

 Introduction. 



The crystallized minerals from the pre-Silurian formations of south- 

 ern Wisconsin: quartz from the Upper Huronian Quartzite of Devil's 

 Lake: arseuopyrite in dike rock at Marquette; calcite from the Madison 

 Sandstone (Cambrian) at Madison. 



The crystallized minerals from the cavities of the Galena Limestone 

 in southern Wisconsin. 



Calcite from Mineral Point, Linden Mine, etc. 



Smithsonite from Mineral Point. 



Galena from Mineral Point, Yellowstone, Highland, G a le na 



etc. 

 Cerussite from Highland, Mineral Point, and Galena. 

 Sphalerite from Shullsburg, Mineral Point, and Galena. 

 Gypsum from Mineral Point. 

 Barite from Linden Mine. 

 Marcasite from Linden Mine, Crow Branch Mine, Mineral Point, 



Diamond Grove, Hazel Green, Galena, etc. 

 Pyrite from Shullsburg and Mineral Point. 

 Azurite from Mineral Point. 

 Malachite from Mineral Point. 

 The Druse Minerals from the Hamilton Cement Rock at Milwaukee: 

 calcite, pyrite, sphalerite, marcasite, celestite, millerite. 

 Diamonds from the Drift. 



INTRODUCTION. 



So far as I am able to determine, nothing has been pub- 

 lished descriptive of the crystallography of Wisconsin 

 minerals. The minerals of economic importance have re- 



1 Read before the Wisconsia Academy of Sciences, Arts, and Letters, June 8th, 1895. 



(109) 



