UNIVERSITY OF CALIFORNIA 



Bulletin of the Department of Geology 



Vol. I, No. 0, pp. 181-192, Pis. 10-1 1. ANDREW C. LAWSON, Editor 



ON 



A ROCK FROM THE VICINITY OF BERKELEY 



CONTAINING 



A NEW SODA AMPH 1 BOLE. 



BY 



Charles Palache, Ph. 1). 

 CONTENTS. 



Page. 



Introduction 181 



The Rock 182 



Constituent Minerals 183 



Secondary Veins 184 



The Blue Amphibole 1S5 



Optical Characters 186 



Chemical Characters 188 



Classification 189 



Concluding Remarks 191 



INTRODUCTION. 



It has long been known that the crystalline schists of the Coast 

 Ranges of California contain in considerable abundance and widely 

 distributed a blue amphibole, related in man}- of its characters to 

 glaucophane. This fact was first announced by Dr. Becker in his 

 report* on the Quicksilver Deposits of the Pacific Slope, in which 

 he gives brief notes on the characters of the mineral, regarded by 

 him as normal glaucophane. No further published description of 

 this mineral is known to the writer. 



In the course of field studies of the crystalline schists in the 



* Monograph XIII U. S. G. S., pp. 76, 77, 102-104. 



