364 



T. L. WATSON — -VIRGILINA COPPER DISTRICT 



Chemical 





I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



Si0 2 



64.12 

 Trace. 



16.32 

 6.72 

 1.38 

 0.64 

 3.49 

 0.33 



62.32 

 0.06 



15.79 

 3.57 

 4.61 

 0.35 

 3.65 

 2.53 



63.22 

 0.03 



16.05 

 5-15 

 2.49 

 0.49 

 3.57 

 1.43 



51.34 

 0.38 



20.07 

 7.03 

 4.03 

 0.38 

 2.83 

 4.18 



48.20 

 0.24 



22.10 

 7.61 

 3.95 

 0.35 

 8.86 

 0.86 



46.45 



Trace. 



13.79 



7.60 



6.41 



Trace. 



10.13 



9.81 



49.51 



Ti0 2 



A1 2 3 



Fe 2 3 



0.57 

 22.42 

 10.03 



FeO 



MnO.. 



CaO 



MgO 



BaO 



2.42 

 0.42 

 7.68 



2 81 



SrO 

















Na 2 



K 2 



Li 2 



6.22 

 0.53 



4.51 



0.76 



5.37 

 0.64 



1.83 

 5.53 



4.90) 

 1.16 J 



Undet. 



Undet. 



H 2 



0.34 

 Undet. 



1.89 

 Undet. 



1.11 

 Undet. 



2.90 

 Undet. 



2.31 



Undet. 



2.66 

 Undet. 



3.41 



PA 



S0 3 .. 



Undet. 



co 2 



V0O0 



None. 



None. 



None. 



None. 



None. 



2.27 



0.90 





















100.09 



100.04 



99.55 



100.50 



100.54 













I. Andesite, dark purplish gray, massive and slightly porphyritic in texture, 

 0.5 mile south of Virgilina, Granville county, North Carolina; Cornfield opening. 

 Analysis by Thomas L. Watson. 



II. Dark massive greenstone ; Overby opening. Analysis by Thomas L. Watson. 



III. Average of I and II. 



IV. Bright schistose greenstone, Blue Wing mine, 3 miles south of Virgilina, 

 Granville county, North Carolina. Analysis by Thomas L. Watson. 



V. Bright schistose greenstone, Fourth of July mine, 2.5 miles south of Vir- 

 gilina, Granville county, North Carolina. Analysis by Thomas L. Watson. 



VI. Bright schistose greenstone, Anaconda mine, 1.5 miles north of Virgilina, 

 Halifax county, Virginia. Analysis by Thomas L. Watson. 



VII. Partially decayed schistose greenstone from same locality as VI. Analysis 

 by Thomas L. Watson. 



VIII. Andesite, 3.5 miles east of Front Royal, Virginia. Analysis by George 

 Steiger, Bulletin 168, U. S. Geological Survey, 1900, page 51; described by Keith, 

 Fourteenth Annual Report, U. S. Geological Survey, page 305. 



IX. Hornblende andesite, summit of southeast spur of Galena mountain, above 

 Big 10 claim, near Silverton, Colorado. Frank R. Van Horn, Bulletin of the Geo- 

 logical Society of America, 1900, volume 12, page 8. 



