ADIRONDACK MAGNETIC IRON ORES 



2 9 



specimens taken for analysis indicate close resemblances in many- 

 cases to the ore -bearing rocks. Professor Cushing has worked out 

 the corresponding mineralogic composition and it will be of interest 

 to note the relative quantities of magnetite present. 



Si0 2 .. 

 AUO3. 

 Fe 2 3 . 

 FeO.. 

 MgO.. 

 CaO. . 

 Na 2 0. 

 K 2 0. . 

 H 2 0.. 

 Ti0 2 .. 

 P 2 5 .. 

 CI.... 



F 



S 



MnO.. 

 BaO.. 



1 



54.10 

 17-45 

 4-52 

 6.47 

 2-33 

 6. 17 

 3.81 

 3.06 



•57 

 .19 



2 



59 • 7o 

 19.52 

 1.89 

 4.92 

 .78 

 3-36 

 5-3i 

 4.14 



•52 



3 

 61 .01 



I5-36 

 2.98 



7-77 

 .78 



4-05 

 3.68 



3-9o 

 • 49 



4 



62.85 



16.80 



2 .96 



2.80 



.48 

 •24 

 09 



49 

 •37 

 .09 



■13 



3 



63-45 



18.38 



1 .09 



2 .69 



•35 



3.06 



5.06 



5-i5 



•30 



.07 



o . 72 

 6.15 

 1.23 

 2 . 19 



•73 

 2.30 



4-3 6 

 5-66 



•77 



7 



68.50 



14.69 



1-34 



3-25 



.26 



2 . 20 



3-5° 



5-9o 



.40 



•03 



05 

 14 

 35 



09 



01 

 02 

 21 

 06 



tr. 

 13 



07 



10 



05 



Magnetite 



100.19 100.23 100.10 100.69 99-73 100.18 100.22 

 6.57 2.73 4.32 4.29 1.58 i.85 1.86 



1 Basic syenite from near Raquette falls. E. W. Morley, analyst. 



2 Augite syenite, road from Tupper Lake to Wawbeek. E. W. 

 Morley, analyst. 



3 Augite syenite, 3^ miles north of Tupper Lake Junction. E. W. 

 Morley, analyst. 



4 Red, quartz, hornblende syenite from north boundary of 

 Litchfield park. E. W. Morley, analyst. 



5 Augite syenite, Loon Lake, Franklin county. E. W. Morley, 

 analyst. 



6 Augite syenite, Little Falls, Herkimer co. E. W. Morley, 

 analyst. 



7 Quartz, augite syenite, 2 J miles south of Willis pond, Franklin 

 county. E. W. Morley, analyst. 



.With the exception of No. 6 (syenite from Little Falls) the rocks 

 represented are from the interior of the Adirondacks, away from 

 the mine localities. 



2 Sedimentary group. The association of magnetites with dis- 

 tinctly Grenville types of gneisses and schists is characteristic for the 

 St Lawrence county occurrences, as well as for some in southern 



