PHYSIOGRAPHY. 129 



Chrysoberyl Chrysocolla. 



2. Analysis. 



By SEYBERT, By THOMSON and MUIR, 



fr. Haddam. fr. Brazil. fr. Brazil. 



Alumina 7360 68-666 - 76-752 



Glucina 15-80 16-000 - 17-791 



Silica 4-00 3999 - 0-000 



Protoxide of iron 3-38 4-733 - 4-494 



Oxide of titanium 1-00 2666 - 0-000 



Moisture 0-40 0-666 - 0-480 



3. Chrysoberyl is found in granite veins associated with Tourmaline, 

 Beryl and Garnet : also in the alluvial deposits of i ivers, along with other 

 species of gems. 



4. It occurs in Brazil along with Diamond and Topaz, also in Ceylon ; 

 in which places it has been found only in sand. The most interesting 

 deposits of this species are in the United States, at Haddam, (Conn.) and 

 Greenfield, near Saratoga, (N.Y.) At the former place it is associated 

 with Garnet, Beryl, Automalite and Columbite ; and at the latter with 

 Tourmaline, Garnet and Apatite. In both cases it exists in granite, 

 traversing gneiss in veins. 



CHRYSOCOLLA. Staphyline Malachite- 

 Haloid e. 



Regular forms unknown. Cleavage none. Fracture 

 conchoidal. 



Color emerald-green, pistachio-green, asparagus-green, 

 passing into sky-blue. If they incline to brown, the mine- 

 ral is impure. Streak white, a little shining. Semi-trans- 

 parent . . . translucent on the edges. 



Rather sectile. Hardness = 2-0 . . . 3'0. Sp. gr. = 

 2*031, a semi-transparent variety. 



Compound Varieties. Botryoidal, reniform shapes or 

 massive varieties : composition impalpable ; fracture more 

 or less perfectly conchoidal. Pseudomorphoses in the 

 shape of Red Copper-Ore and of Copper-Mica. Im- 

 pure varieties are often earthy. 



