ANTHRDPOIM^ SOCIETY 

 lOF^A/S^INQTON, D. C. 



PROCEEDINGS 



CALIFORNIA ACADEMY 



SCIENCES. 



CONTRIBUTIONS TO THE MINERALOGY OF THE 

 PACIFIC COAST. 



BY W. LINDGREN, U. S. GEOL. SURVEY. 



1. Chromiferous Chlorite. 



The great serpeiitiae belt crossing the North Fork of the 

 American River, above Dutch Fhit, contains several depos- 

 its of chromite, some of which are worked on a small scale. 

 While examining the ore from one of these occurrences — 

 Green Valley, in the canon of the American River below 

 Towle's on the Central Pacific Railroad — I found coatings 

 of a scaly mineral of a beautiful peach blossom color, to- 

 gether with smaller pieces of the same mineral in massive 

 state. The substance proved to be a chlorite, and is most 

 closely allied to that variety of cUnochlore to which Kok- 

 scharow"^ has given the rather harshly sounding name of 

 Jiofschubeite. With a magnifying glass the scaly coatingsi 

 are seen to be composed of thin hexagonal tables from 



'Bull. Ac. St. Petersburg, 369. 1861. 

 2d Ser., Vol. I.— 1. Issued December 20, 1887. 



