﻿250 



SMITH. 



grains, chlorite, calcite, etc. Besides the phenocrysts of feldspar, there 

 are fragments of hornblende crystals, but in most cases there is little 

 left of these, they having altered to both chlorite and serpentine. 



. Plate I, fig. 10, shows one section of the hornblende in this slide. 

 The extinction is parallel and normal to the cleavage. However, this is 

 a monoelinic amphibole and not an orthorhombic one. The pseudo- 

 orthorhombic appearance is due to the section being cut from some plane 

 normal to the plane of the optic axes from (100) or (001). 



A very peculiar feature of these slides is the figure represented by the 

 diagram Plate I, fig. 11. 



Remarks. — What this form may have heen originally is certainly open to 

 conjecture. 



APPENDIX. 



Below are three analyses of rocks coming from this province, but 

 unfortunately the hand specimens have been misplaced so that no de- 

 scriptions can be made. 



Table III. — Benguet No. 17. 



Constituent. 



Per 



cent. 



Molecu- 

 lar pro- 

 portions. 



Orth. 



Alb. 



An. 



Mag. 



Diop. 



Hyp. 



Quartz. 



Si0 2 



47.94 

 21.96 

 2.48 

 3,42 

 6.83 

 12.63 

 1.49 

 0.19 

 2.38 



799 

 216 

 016 

 047 

 171 

 226 

 024 

 002 



12 

 2 



144 

 24 



380 

 190 





72 





25 



Al.,0, . . 



Fe»0 3 



16 

 16 









FeO- 









6 

 30 

 36 



25 

 141 





MgO 











CaO 







190 









Na.,0_ _ _ 



2 



24 







KoO 













H 2 - - - 

































99.32 



















Constituent. 



Norm. 





.025 

 .002 

 .024 

 .190 

 .036 

 .030 

 .006 

 .141 

 .025 

 .016 



7. 50 Q 7. -501 



1. Ill VSal 74.07 

 12.581 F 66.51) 

 52.82) 



4.181 



3.0ol 7.97| 



°- 79 ' lp 25.371 

 14. 101 



3.30/ 17 - 4 °J Fem 29 - 08 



3.71 3.711 





Albite_ _. 



Diop _ 



Hyp„_ 







|Ca __ 

 -JMg- 

 [Fe „ 

 fMg - 

 iFe __ 



Magnetite _ _ - . _ 



















Class II. Dosalane. 

 Subclass I. Dosalone. 

 Order 5. Germanare. 

 Rang 5. Corsase. 

 Subrang 5. (Persodic. ) 

 ( Luzonose ? ) 



