332 



WATSON AND CLINfi IGNEOUS BIKES tN VIRGINIA 



II. Quartz gabbro from Arey farm. 1.5 miles south of Milnesville. Augusta 

 County. Virginia. J. G. Dinwiddie. analyst. 



III. Xepheline syenite from Gliek farm. 1 miles east of Mount Solon. Au- 

 gusta County. Virginia. J. Wilbur Watson, analyst. 



IV. Xepheline syenite from property adjoining the Charles Curry farm. 5 

 miles southeast of Mount Solon. Augusta County. Virginia. J. G. Dinwiddie. 

 analyst. 



V. Olivine diabase from Cross Keys. Augusta County. Virginia. J. Wilbur 

 Watson, analyst. 



VI. Camptonite < analeite-hornblende-basalt i from Mossy Creek. Augusta 

 County. Virginia. J. Wilbur Watson, analyst. 



VII. Teschenite < analeite-basalt i from Gliek farm. 4 miles east of Mount 

 Solon. Augusta County. Virginia. J. Wilbur Watson, analyst. 



In the annexed table are tabulated the norms of the rocks, arranged in 

 the same order as the analyses in the table above. Further chemical 

 relations are developed from a study of this table, especially the relations 

 of the rocks in the quantitative system of classification. 



I 



Q 22. on 



Or 27.80 



Ab 37.73 



An o.2s 



Ne 



C 1.12 



Hy 1.53 



Di 



01 



Wo 



Mt 2.32 



II 0.61 



Ap 0.31 



Pr 



Rest 1.01 



100.24 100.83 100.23 100.72 100.56 100.26 100.81 



Table of Norms 











II 



III 



IV 



V 



VI 



VII 



15.78 













s,::«i 



29.17 



30.02 



3.34 



22.24 



17.24 



24.63 



35.63 



25.68 



12.5s 



7. SO 



3.14 



27.24 



1.11 



0.56 



33.36 



14.46 



12.51 





24.14 



32.94 





8.52 



14.20 



11.97 







23.49 







2.07 



0.40 



4.18 



16.90 



22.01 



2&24 





0.41 



0.46 



2.53 



3.38 



7.20 



3.25 



3.71 



1.39 



3.71 



1U.44 



&58 



1.22 



0.15 



0.46 



1.37 



3.50 



1.26 



0.67 



0.34 



0.34 



0.34 



2.09 



2.69 







0.34 



0.36 



0.36 





5.10 



4.81 



4.35 



2.5S 



4.80 



" 



Quartz is noted in only two of the seven norms, toscanose ( I ) am 

 tonalos? ( II ) . The feldspars are present in large amount in all tht 

 norms, the individual species showing wide range, with orthoclase and 

 albite usually in largest percentages. Anorthite is very subordinate iii 

 amount in the persalanes (I, III, and IV). but is one of the dominant 

 species in dosalane (II) and in the salfemanes (except in ourose). The 

 lenad. nephelite, ranging in amount from 8.5 to 33 per cent, is present in 

 four of the seven norms. 



