UNIVERSITY OF CALIFORNIA 



Bulletin of the Department of Geology 

 Vol.2, No. 11, pp. 327-348, ANDREW C. LAWSON, Editor 



CONTRIBUTION TO THE MINERALOGY 

 OE CALIFORNIA. 



BY 



Walter C. Blasdale. 

 CONTENTS. 



Introduction 327 



A Green Hornblende 328 



Occurrence 328 



General Description 329 



Optical Properties 329 



Cohesional Properties 330 



Chemical Properties 332 



A Blue Hornblende 335 



Occurrence 335 



General Description 336 



Optical Properties 337 



Chemical Properties 337 



Tremolite 340 



Chlorite 341 



Talc 341 



Diallage 342 



Altered Diallage.. 343 



Serpentinized Anthophyllite 344 



Albite 345 



Note on the Probable Relationships of the Above Minerals 345 



INTRODUCTION. 



Comparatively few of the mineral species which are found in 

 the Coast Ranges of California have been submitted to detailed 

 investigation. The desirability of definite and complete knowledge 

 of the more widely distributed species, especially those which are 

 important rock constituents, is self-evident; it is essential for com- 

 parison and correlation with similar minerals from other regions, 

 and is also necessary for any comprehensive study of the relations 



