﻿BENGUET PETROGRAPHY. 



Table IV. — Benguet No. 25. 



251 



Constituent. 



Per 

 cent. 



Molecu- 

 lar pro- 

 portions. 



Orth. 



Alb. 



Mag. 



Diop. 



Hyp. 



Quartz. 



SiOo .. 

 A1»0 3 - 

 Fe 2 3 

 FeO- 

 CaO — 

 MgO- 

 K 2 0- 

 Na 2 0_ 

 F,0- 



58.35 

 16.70 

 4.08 

 3.28 

 7.71 

 3.29 

 2.87 

 2.62 

 1.16 



972 

 164 

 26 

 45 

 138 

 82 

 31 

 42 



186 

 31 



264 

 42 



182 

 91 



53 



195 



31 



100.06 



Constituent. 



Norm. 



Quartz 



Orthoclase 



Albite 



Anorthite _ 



Ca _ 

 Diopide 4Mg_ 



|Fe . 

 (Mg_ 



Magnetite 



Hyp 



Q 11.70] 



Ual 

 F 66.25] 



■8.28 



10.44) 



5.721 



P 16.161 



>Fem 22.55 



6.03 M 6.03 



100. 14 



Remarks. — Microscopic examination shows this rock to be somewhat altered so 

 that it is not well adapted to classification according to this system. 

 Class II. Dosolane. 

 Subclass I. Uosalone. 

 Order 4. Austrare. 

 Eang 4. Tonalase. 

 Subrang 2. (Sodipotassic. ) 

 Harzose. 



Table V .—Benguet No. 120. 



Constituent. 



Per 

 cent. 



Molecu- 

 lar pro- 

 portions. 



Orth. 



Alb. 



Am. 



Mag. 



Diop. 



Hyp. 



Quartz. 



SiO» - 



53.92 

 18.68 

 4.27 

 2.65 

 2.93 

 8.85 

 2.92 

 2.66 

 2.33 

 .44 



898 



183 

 026 

 037 

 073 



158 

 047 

 029 



] 148 



174 

 29 



282 



47 



214 

 107 





102 



33 



93 



AUO, 



Fe 2 3 



FeO 



26 

 26 















7 

 44 

 51 



4 



29 





MgO _ 











CaO 







101 







Na.,0 



29 



47 







K,0. 



H.,0 + 

























HoO— 



















99. 55 



















