112 Bulletin of Laboratojies of Denison University. [Voi. xii 



Chemical 



SiO^. — 



TiO, 



Al,03 



Fe.Oj 



FeO 



MnO 



CaO 



MgO 



BaO 



SrO. - 



NajO 



KjO 



Li^O.. 



HjO 



PA — 



SO3 



COj- 



VA 



VII. 



49-51 

 0.57 



22.42 

 10.03 



2.42 

 0.42 



7.68 

 2.81 



Undet. 



341 



Undet. 



0.90 



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

 ture, 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 Virgi- 

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



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

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



VI. Bright Schistose greenstone. Anaconda mine, 1.5 miles south of Vir- 

 gilina, 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; de- 

 scribed 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 Geological Society of America, 1900, volume 12, page 8. 



