ELIZABETHTOWN AND PORT HENRY QUADRANGLES 



145 



hypersthene, brown hornblende, plagioclase and ilmenite-magnetite 

 are the chief minerals present, while microperthitic orthoclase does 

 not fail. The close relations of the gabbros with the syenites are 

 thus indicated. Garnet varies from absence to richness and at 

 times penetrates the plagioclase in peculiar, fingerlike growths. 

 The wall rock has been analyzed by George Steiger and the ore 

 by W. F. Hillebrand with the following results. In the recasting 

 of the rock the results involve no unusual assumptions, but in the 

 ore all the silicates and the spinel are. based on an estimate of 

 the distribution of the bases. The other minerals involve no 

 assumptions. 



Si02 • • . 



Ti02 ... 

 AUOz . . . 

 Fe203 ... 

 FeO . . • 

 NiO.CoO 

 MnO .. . 

 MgO..... 



CaO ■•.. 

 BaO ... 

 K2O .... 



NasO ... 

 H2O ■... 

 P2O5 .... 



V2O5 . . • • 

 CO2 •••• 



S ....... 



C 



Rock 



44-77 



5.26 



12.46 



4-63 



12.99 



tr. 



•17 



5-34 



10-20 



tr. 

 •95 

 2.47 

 .60 

 .28 

 n.d. 



.■37 

 .26 

 n.d. 



Ore 



11-73 



12. 3T 



6.46 



30.68 



27.92 



n.d. 



n.d. 



3-35 



3-95 



n.d. 



.26 



•SO 



.64 



.82 



.04 



•32 



•04 

 •05 



Rock 



CI. 

 F 



Ore 

 .12 



tr. 



Total 100.75 



Fe 



Sp. Gr. 3 • 09 



Ilmenite 9-73 



Magnetite • 6.73 



Pyrrhotite -65 



Apatite .67 



Olivine 2.93 



Pyroxe4ie 32.71 



Plagioclase 37-36 



Orthoclase 5- 00 



Kaolin 3 60 



Calcite -90 



Spinel 



99.19 

 44.19 

 4-138 



22.95 



44-31 



.09 



1.74 



7-33 



5-01 



12.53 



3-55 



In the quantitative system the rock comes under class III, 

 Salfemane, order 5, Gallare, rang 4, Auvergnase, subrang 3, Au- 

 vergnose. The ore falls in class IV, Dofemane, order 4, Adiron- 

 dackare, suborder 2, Adirondackore, rang 1, Adirondackase. 



The above is unusually high in apatite for ore of this variety. It 

 is also remarkable in yielding a very small amount of free carbon, 

 'd?: to the condition of which in the ore one can only surmise. 

 Graphite would be the most probable mineral. 



Oak Hill pit. In speaking of the Ross pit upon an early page, 

 it was remarked that an apparently titaniferous ore had been 

 opened higher up on the hillside. The locality is approximately a 

 mile north of New Russia, on the western side of the highway. 

 A specimen yielded W. F. Hillebrand the following results, which 

 liave been recast for the mineralogy. The ore is low in TiOg but 



