340 



APPENDIX, 



Genus. 

 Argillaceous slate . 



Chlorite . . . , 

 Staurotide. 



Aluminous minerals 



Clay 



L 



{Serpentine . . . 

 Steatite . . . . 

 Asbestus . . . . 

 Sulphate of barytes 



Barytic minerals 

 Strontian 



BisuMiNOUS minerals 



Soda 



r 



Sulphate of strontian 



III. COMBUSTIBLES 

 Bitumen 



I Graphite 

 [Coal . 



Varieties. 

 J Argillite. 

 \ Bituminous shale. 

 Chlorite slate. 



f Potters' clay. 

 I Pipe clay. 



(Variegated clay. 

 Blue sulphateci clay. 

 Green sulphated clay. 

 Opwagunite. 

 Common serpentine. 

 Steatite. 

 , Com. asbestus. 

 , Lamellar. 

 , Foliated. 



(Petroleum. 

 Maltha. 

 Asphaltum. 

 Granular graphite. 

 Slate coal. 



IV. SALTS. 



(Muriate of soda 

 Alkaline sulphate of alumina 



f Native salt. 

 \ Salt springs. 

 Alum. 



a. Metallic Minerals. 



1. Copper. 



This metal is frequently found, in detached masses, in the dilu- 

 vial soil along the southern shore of Lake Superior, and in the 

 high and barren tract included between Lakes Huron, Michigan, 

 and Superior, and the Mississippi Kiver, as general boundaries. 

 Thus, it has been found upon the sources of the Menomonie, 

 Wisconsin, Chippewa, St. Croix, and Ontonagon Eivers, but 

 most constantly, and in the greatest quantity, upon the latter. 

 There are many localities known only to the aborigines, who 

 appear to set some value upon it, and have been in the habit of 

 employing the most malleable pieces in several ways from the 

 earliest times. It occurs mostly in detached masses, resting upon, 

 or imbedded in, diluvial soil. These masses, which vary in size, 

 are sometimes connected with isolated fragments of rock. Such 

 is the geognostic position of the great mass of native copper upon 

 the banks of the Ontonagon, which has been variously estimated 



