490 LIST OF MINERALS, THEIR 



Siderite, see Quartz, blue. The Siderite of Kirwan is Phos- 

 phate of Iron. 



SlDEROCLEPTE. 

 SlDERO-GRAPHITE. 



Silex, see Quartz. 



Siliceous spar of Haussman, occurs with the Tourmaline at 



Chesterfield in Massachusetts, see Cleave landite. 

 SILVER. 



carbonate, 

 muriate. 



crystallised. A cube. 

 mamellated. 

 amorphous, 

 native. 



crystallised. A cube. 

 capillary, 

 massive. 

 . . . .antimonial. 



crystallised, 

 granular, 

 massive. 



.... arseniferous. 

 sulphuret. 



crystallised. A cube. 

 amorphous. 



of Silver and Antimony ; Red silver. 



impure or decomposed ; Black silver. 

 Its colours are light red. 

 dark red. 

 crystallised. An obtuse rhomboid, P on P', 



109 56'. 

 amorphous, 

 scaly, from Colivan in Siberia ; Aerosite. 



of Silver and Antimony, but probably differing 



in the proportions from those which constitute 

 Red silver. This variety was described by 

 Rome de 1'Isle under the name of u Mine 



d' Argent grise antimoniale." It has since 

 been called Bournonite from Freyberg. A 

 right rhombic- prism, M on M', 100, as mea- 

 sured by W. P. on cleavage planes. 



of Silver, Antimony and Iron ; Brittle silver. 



All the crystallised specimens denominated 

 Brittle silver, which I have seen, appear to be 

 Red silver. Some of those specimens have been 

 transparent and red, and others distinctly red 



