54 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
100. 48 | 100.08 | 100.00 | 100. 29 99. 91 
2 Determined by difference. 
7. MESABI DISTRICT, MINNESOTA. 
The following rocks, described by Leith in Mon. XLIII, do not fall legitimately 
within this section of the present bulletin. There seems, however, to be no other 
convenient place for them, and so the niceties of classification have been ignored for 
reasons of expediency. 
A. Greenalite rock, test pit, Cincinnati mine. Contains green and brown trans- 
parent granules, with opaque brown to black ones, in a matrix of chert. P. R. C. 1668. 
B. Greenalite rock, same locality as A. Contains greenish-yellow granules, slightly 
altered to amphibole in a matrix of amphibole with subordinate chert. P. R. C. 1669. 
C. Greenalite rock, near W. quarter post, sec. 35, T. 59 N., R. 15 W. Resembles 
A. P.R. OC. 1670. 
D. Greenalite rock, near SE. corner of sec. 22, T. 59 N., R. 15 W. Contains yel- 
lowish-brown, transparent, and dark-brown to black and opaque granules in a matrix 
which is mainly amphibole, possibly actinolite. All four rocks contain oxides of 
iron, either limonite or magnetite. P.R. C. 1671. 
Analyses by George Steiger, record Nos. 1931 and 1992. In three of the rocks the 
portions soluble and insoluble in hydrochloric acid were analyzed separately. 
Avy B. Cc. 
Insoluble.| Soluble. |Insoluble.| Soluble. |Insoluble.| Soluble. 
61 
S108 scccceecagcas upesorereentees 36. 50 19. 30 13.01 33. 11 48. 45 13.45 | . 50.96 
. -56 . 
Be103 says saisnexe 2225 seeteee sexe - 76 13. 83 | 2. 60 6. 44 64 15.00 5.01 
H20 at 105°. 
P205 
C (organic) 
Insoluble. <a-os<csercaxexnverese 
E. Ferruginous chert, sec. 28, T.58N., R.17 W. P.R. CG. 1672. 
F. Ferruginous chert, horizon of ore deposits, Oliver mine. P. R. C. 1673. 
G. Amphibolitic chert, Old Chicago mine. P. R. ©. 1674. 
