394 Eggleston — Emptive Rocks at Cutting sville, Vt. 





I 



II 



III 



IV 



V 



VI 



VII 



H 2 0+ 



0-58 



103 



110 



0-50 



0-52 



0-58 



0-70 



H,0— 



0-03 







015 









P s O 



0-38 



0-60 



014 



Trace 







0-54 



C0 2 



0-39 















ZrO, 



0-02 















so 3 



None 



not det. 



008 











CI 



007 



Trace 



014 



012 









F 



005 















Cr 2 3 



None 















BaO 



0-26 



not det. 



012 



008 









SrO 



0-04 













i 



FeS„ 



015 















Fe 7 S s 



014 















Li,0 



None 















Sum 



100-27 



99-69 10017 



99-98 



99-35 



99-66 



10000 



I = Hornblende-biotite syenite, type phase (laurvikose), Cuttingsville, 

 Vt., H. E. Merwin, analyst. 

 II := Pulaskite (laurvikose), Mt. Johnson, Quebec. 

 Ill = Pulaskite (laurvikose), Shefford Mt., Quebec. 

 IV = Umptekite (umptekose), Eed Hill, Moltonboro, N. H. 

 V = Laurvikite (laurvikose), Nottero, Norway. 

 VI — Laurvikite (laurvikose), Frederiksvarn, Norway. 

 VII = Laurvikite (average of 3 analyses, E. A. Daly) . 



II, III Quoted from F. D. Adams, Jour. Geology, vol. 11, p. 271, 1903. 



IV, V, VI 



VII 



Washington, H. S., "Chemical Analyses of 

 Igneous Eocks": U. S. Geol. Surv., Prof. 

 Paper 14, pp. 253, 203, 1903. 



Daly, E. A., ' ' Igneous Eocks and Their Origin, ' ' 

 p. 23. 



The norm (laurvikose) was calculated to be: 



Orthoclase 24-46 



Albite 4401 



Nephelite 9-94 



Anorthite 12-81 



Olivine 4-75 



Ilmenite 1-36 



Magnetite 0-23 



Corundum 0-31 



Apatite 0-93 



Water, etc 1-47 



100-27 



A coarse-grained phase of this syenite is best shown in 

 a narrow belt between essexite and pulaskite, extending 

 for a part of the distance between the summit of the north 

 knob and the molybdenite prospect (M, fig. 1) near the 

 crest of Granite Hill. Hornblende in prisms, occasion- 

 ally upwards of 2 inches in length, is the most prom- 

 inent constituent. Flakes of biotite, sometimes half an 

 inch across, are sparsely scattered through the rock. 

 Titanite and pyrite are visible without a lense. As the 



