q26 



NEW YORK STATE MUSEUM 



Composition and norm of Grenville quartz-syenite (dellenose) 1-M-5 

 from near Lake Catlin 





Chem. 

 comp. 



Mol. 

 ratio. 



Or. 



Ab. 



An. 



Di. 



Wo. 



Mt. 



Ti. 



Py. 



Qz. 



Si02 



68.66 

 12 .98 

 2.89 

 1 .26 

 0. 76 

 2 .63 

 2.05 



7-5° 

 0.48 

 0.C9 

 . 19 

 "0 .07 

 .01 

 0.08 

 0. 24 

 0.07 



.144 

 .127 

 .018 

 .ot8 

 .019 

 .047 



•033 

 .080 



. 4 70 . 100 



.028 

 Id 



.041 



.009 



002 





.386 



AI2O, 



80 



33 



Fe.Os 









t8 









FeO 













17 









M?0 









19 

 21 







CaO 







14 



9 





2 







Na^O 





33 







K2O 



8n 

















H2O + 





















H2O — 























Ti02 



.002 

 .0005 















2 







P2OS 



















F 





















s 



.002 

 .003 

















2 





MnO 









2 





I 







BaO 



































Total 



99.96 



080 



•033 



.014 



.041 .009 



.018 



.002 





.386 



Or.. 



Ab. . 



An. , 



Qz.. 



Di.. 



Wol. 



Mt. . 



Ti.. 



Py.. 



Ap. 



44-37 



T7-34 



3-97 



23.18 



4-5° 

 1 .06 

 4.20 



0-33 

 0.15 

 0.15 



88.86 



10.39 



Sal. 88.86 



Class, _ == 



i^em. 10.39 



Order, Q = ^3_:l8_ 

 'F 65.68 



persalane 



.35 = 4, britannare 



Rang 



K2O' + NasO- _ii3 



Subrans:, 



CaO' 

 Na^O' " 



2.4= 2, toscanase 



So 

 33 



47 

 ! .4 = 2, dellenose 



Total 99.25 



E. W. Morley, analyst. 

 Chemically this rock is sharply distinguished from the syenites 

 by the somewhat lower alumina and soda, and the high potash. 

 The slide shows the feldspar to be mainly microcline, though with 

 some microcline-microperthite and microperthite. It shows con- 

 siderable quartz though by no m.eans so much as the analysis indi- 

 cates, and the dark colored minerals are augite and titanite, very 

 little magnetite being present. The augite must therefore be high 

 in iron. The character of the feldspar is quite different from that 

 of the syenites, as indeed might be expected from the analysis, 

 and this constitutes the main difference between this rock and the 

 syenites. The augite must also be of quite different composition. 



