3. This substance is found in the solfataras of Guadaloupe, the Lipari 

 islands, at Milo and other islands in the Grecian archipelago ; at Copi- 

 apo, a province of Coquimbo in Chili, where it forms with White Cop- 

 peras a large mass ; and at Mendoza near the foot of the Andes. 



SOMMERVILLITE. (See Idocrase.) 

 SOMMITE. (See JVepheline.) 



SORDAWALLITE. 



Massive : composition impalpable ; no trace of cleavage. Frac- 

 ture conchoidal. 



Lustre vitreous, inclining to semi-metallic. Color greenish 

 black or greyish black. Opake. 



Brittle. Hardness, equal to that of glass. Sp. gr. = 2-53. 

 1. It becomes reddish by exposure to the atmosphere. Before the 

 blow-pipe, it forms with difficulty a blackish globule. With a small 

 quantity of soda, it yields a blackish green globule ; with a larger quan- 

 tity, a rough slaggy mass is produced. Borax dissolves it into a green 

 It is partly soluble in muriatic acid. 



2. Analysis. 

 By NORDEJVSKIOL.D. 



Silica 



Alumina ..... 



Peroxide of iron - - 

 Magnesia ..... 



Phosphoric acid - .... 



Water 



49-40 

 13-80 

 1817 

 10-67 

 228 

 4-38 



