W. T. Schaller — California Minerals. 191 



Art. XI Y. — Notes on some California Minerals; by 

 Waldemae, T. Schaller. 



Halloysite. 



The pink clay occurring at Branch ville, Ct., has been shown* 

 to be montmorillonite, while that occurring at Norway, Me., 

 has provenf to be ciraolite. That from the lepidolite mine 

 near Pala, San Diego Co., California, differs from both of the 

 New England clays, being comparable with halloysite. 



At Pala, the halloysite occurs in large seams, often several 

 inches thick, and extending many feet in length. The clay is 

 somewhat moist, but quickly dries to a crumbling mass when 

 taken out of the mine. In color it is rather deeper pink than 

 the Norway cimolite and occasionally is somewhat translucent. 

 It readily crumbles to a fine powder when placed in water. 

 The material analyzed had been drying in the air for over 

 three months. 



The results of analysis are : 



Si0 2 „.... 43-62 



A1 2 3 35*55 



Fe 2 3 ._ -21 



MnO _._ -26 



CaO ■ 1-02 



MgO -19 



Li 2 - -23 



Na 2 -19 



K 2 ____ -03 



H 2 (107°) 6-63 



H 2 (ab. 107°) _ 12-25 



Ti0 2 none 



100-18 



The iron was determined as Fe 2 3 , FeO not being tested 

 for. The analysis agrees well with the formula 



H 4 Al 2 Si 2 9 + H 2 0. 



Amblygonite. 



The occurrence of amblygonite at the lepidolite mine at 

 Pala, California, has already been noticed, and a somewhat 

 fuller description of the mineral is here given. A large 

 deposit has been uncovered and the indications seem to show 

 that it is merely a small part of an extensive body of massive 



* This Journal, xx, 283, 1880. f Ibid., xxxii, 355, 1886. 



