MINERALOGICAL NOTES. 
By W. T. SCHALLER. 
1. HAIjTjOYSITE. 
The pink clay occurring- at Branchville, Conn., has been shown a to 
be montmorillonite, while that occurring at Norway. Me., has proved 6 
to be cimolite. That from the lepidolite mine near Pala, San Diego 
County, Cal., 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 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 occasion- 
ally 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 shown below. 
Si0 2 43. 62 
A1 2 3 35. 55 
Fe 2 3 21 
MnO 20 
CaO 1 . ( )2 
MgO : 19 
Li 2 23 
Na,0 19 
K 2 6 03 
H 2 (107°) 6.63 
H 2 (above 107°) 12. 25 
Ti( ), 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. 
"Am. Jour. Sci., vol. 20, 1880, p. 283. '- Ibid., 32, 1886, i>. 355. 
121 
