a 
190 F, A, Genth’s Contributions to 
M ineralogy. 
Arr. XIX.—Contributions to Mineralogy ; by F. A: GENTE. 
1. Gold, pseudomorph after Aikinite, 
former communication (this Journ., [2], vol, xxviii, 246- 
255) I have called attention to the occurrence of gold in pseu: 
domorphs and other forms and associations, which admit of no 
doubt that it must have been in solution, previous to its deposi- 
go 5 
irregularly shaped particles, evidently formed simultaneously W! 
the aikinite Siac ot aye iis Saaottinoetion. ¢ 
2. Antimonial Arsenic and Arsenolite. 
An interesting variety of antimonial arsenic in reniform Snel 
Tystalline, somewhat radiated oO | wee) ; 
white and iron-black on a fresh fracture, but greyish black fo 
} the Comstock ’ of the Cee : i 
wi 
