466 NATURAL HISTORY. 



and Metallic Antimony. The first, obtained by simple 

 fusion, -which separates the accompanying rock, is the 

 antimony of the shops. The smelting process extracts 

 the pure metal and forms the latter, which, alloyed with 

 tin, forms the metal on which music is engraved, with 4 

 to 16 parts lead to one of antimony, is used in the mak- 

 ing of type metal. It is a constituent of Britannia ware. 



Silverblende Dark red Silver Ore Sitlphuret of 

 Silver and Antimony. Composition partly of silver 

 and partly of arsenic. In the first case it mostly occurs 

 crystallized, in the latter the structure is massive, clus- 

 tery, and disseminate. 1. That containing antimony 

 (dark red silver ore) has a metallic adamantine luster ; 

 color crimson-black, approaching lead-gray ; streak cher- 

 ry-red, sometimes translucent on the edges; fuses on 

 charcoal, gives out a sulphurous odor, and yields a dark 

 metallic globule, from which silver may be obtained. 

 H. = 2.5 to 3.0. G. = 5.78 to 5.85. Occurs princi- 

 pally with calcareous spar, native arsenic, and galena in 

 the Hartz, Bohemia, Hungary, and Norway. In Mexico 

 is worked extensively as an ore of silver. 2. Arsenica- 

 blende, light red silver ore ; luster adamantine ; color 

 cochineal-red ; streak Aurora-red ; by burning gives off 

 sulphurous and arsenical fumes, instead of oxyd of anti- 

 mony. Localities Bohemia, the Hartz and Black For- 

 est. This is a very valuable and important ore for 

 obtaining silver, especially at the South American 

 mines. 



Cinnabar Sulphuret of Mercury occurs partly in 

 small crystals, partly in massive or fibrous structures : 

 of disseminated globules or in arborescent formations on 

 rocks. Color cochineal red, sometimes vary into lead- 

 gray; streak scarlet red; luster adamantine, unmetal- 



