762 THE GEOLOGY OP MINNESOTA. 



[Quartzy t. Hematite. Silica-kaolin . 



NO. 1696. QUARTZYTE. 



Pit in S. E. 14 N. E. ^ sec. 4, T. 58-16 W., Chicago property. 

 Ref. Annual Report, xxi, pages 124, I'M. 



M<'</. A very fine-grained, compact, pinkish quartzyte. Similar to No. 1632. 

 No section. 



A</c. Animikie (Pokegama quartzyte). u. s. G. 



No. 1697. QUAKTZYTE. ( Ferrugiiwuv. ) 



JVlcKinley, Mesabi range. From the well sunk for water at the mining camp. 

 Ref. Annual Report, xxi, page 155. 



Meg. Collected as "black slate." 



Mic. The rock is essentially composed of fine interlocking quartz, hut with so 

 much iron that it has a dark color. The iron is in at least three forms: (1) Magne- 

 tite, which is black, and in very fine grains, grouped loosely in certain areas; (2) 

 (liH'thite, which is rusty yellow and arranged frequently in radiating spangles; and (3) 

 a reddish-brown, feebly translucent form which is in coarser isolated grains coated 

 with a thin opaque crust of what appears to be magnetite. This reddish-brown ore 

 is like chromite. On uncovering the slide and after washing off the Canada balsam in 

 benzine, this dark-brown portion was dissolved in boiling hydrochloric acid, and is 

 therefore hematite. One section. 



Age. Animikie. N. H. w. 



No. 1698. HEMATITE. 



" A clayey ball changed to hematitic rock, from the southern pits at McKinley's ; probably from the black 

 slate horizon." . 



Ref. Annual Report, xxi, page 155. 



Meg. A mass, somewhat slaty, of soft red hematite. No section. 

 Aye. Animikie. u. s. G. 



No. 1699. HEMATITE. 



Lone Jack mine, Virginia. 



Ref. Annual Report, xxi, page 155 ; vol. iv, pages 371, 372. 



Meg. Iron gravel, reddish, angular and sub-rounded. 



Mic. The sections consist of slices of two of the balls composing the gravel. 

 They are chiefly opaque, but slightly translucent with dark brownish red color in a 

 few scattered small areas. Two sections. 



Age. Cretaceous (?) N. H. w. 



No. 1700. SILICA-KAOLIN. 



" Mixed kaolin and spongy ochre and hematite, Mesabi Mountain mine, near Virginia." 

 Ref. Annual Report, xxi, page 155. 



Meg. Soft, greasy, white, reddish and brownish material, the result of alteration 

 of the taconyte. See under No. 1701. No section. 



Age. Animikie (iron-bearing member). u. s. G. 



