Arrr.NPix. 169 



I Superior, fa detached masses con- 



1 With'primitive boulders. Harder than th< 



89. v immon. Preaque Isle, Lake Superior. 



SO. 8 . \\ ith the preceding. Color a light 



reen, and takes a DtwpohBh. E \ - in the common 



varit ty. 



81. Ps ova si.imt.ntim:. With the preceding. This 



beauti ful green mineral constitute! a portion of the veins of the precious 

 iitiiH*. hi crystalline impiessiona arc v< ry distinct. 



89. .\::<;:li.itk. Hirer 9t Lous, northwest of Lake Superior. 

 N y vertical in its position. 



CL \SS III. Combustibles. 



88. Peat. Marine sand formation composing the shore of Lake 

 Superior, b twei □ White-fish Point and Grand Marrais. Also, on the 



island i>t .Michilimackinac. 



CLASS IV. Ores and Metals. 



84. Native corrER. West side of Kewcena Point, Lake Superior. 

 I ted in a vein with carbonate of copper, and copper black, in the 



trap rock. 



^•">. (Jnrrr.R black. With the preceding. 



>.\ate of COPPEK, QSEEN. With the preceding. 

 T i • . » Dunerala (85 and 86) characterize the trap rock of the 

 K ■• . Lake Superior, from Montreal 

 to, and around ft ad-hill Bay. The entire area 



may be estimated to comprise a rocky, serrated coast of about seventy- 

 tes in length, and pot to □ or eight miles in width. 



Hie principal r< I lloclic Ycrd, and along the 



which we . - the Black Rocks. At the latter, native cop 



j>er is one of the constituents of the \< in. 



Green and blue carbonate of copper, wai also observed in limited 

 quantity, in small rounded taaSB s at one of the lead diggings near Mine- 

 ral Point. Iowa county. 



! -. I :omate of iron. Presoue Isle, Lake Superior. 



39, Sulfhurbt of lead. Lead mines of Iowa couuty, Michigan 



1 '. ! . LTHT carronatf. OF LEAD. Brigham's mine, [owa COUnty, 

 in small masses, of a yellowish white, dirty color, 

 ireral of the lead mines (diggings) in 

 uthern parts of the county. 



