WELLS AND LARSEN : LORETTOITE 



671 



light, probably galena or metallic lead. The results of a chemi- 

 cal analysis of lorettoite are given in Table 1. The material on 

 which the second chlorine determination was made contained 

 very little impurity. 



TABLE 1 



Composition of Lorettoite from Loretto, Tennessee 

 (R. C. Wells, analyst) 



Chlorine was determined by gently fusing the mineral with 

 sodium carbonate and, after carefully neutralizing the cold 

 aqueous extract of the melt w r ith nitric acid, precipitating and 

 weighing the chlorine as silver chloride. A determination of 

 chlorine in selected material, almost entirely homogeneous, from 

 the California specimen gave 4.94 per cent. 



If all the constituents except chlorine, lead, and oxygen in 

 the complete analysis are regarded as extraneous, the composi- 



