154 PHYSIOGRAPHY. 



Realgar Red Antimony. 



With Fahlerz and Iron Pyrites, engaged in Dolomite, at St. Gothard in 

 Switzerland. More generally, it is met with in metalliferous veins, par- 

 ticularly with ores of silver and lead, with Native Arsenic, several spe- 

 cies of Pyrites and Heavy Spar. The chief localities are K'apnik and 

 Nagyag in Transylvania, Felsobanya in Upper Hungary, Joachimsthal 

 in Bohemia, Schneeberg in Saxony, Andreasberg in the Hartz, and ma- 

 ny other places. It also occurs in Peru. 



4. Like Orpiment, it is employed as a pigment. 



RED ANTIMONY. Prismatic Malacone Blende. 



Primary form. Right rhombic prism. M on M=101 

 19'. 



Secondary form. Primary form, having the edges trun- 

 cated. 



Cleavage, parallel with M and the shorter diagonal, per- 

 fect ; traces in other directions. 



Fracture not observable. Surface more or less deeply 

 streaked, longitudinally. 



Lustre common or metallic adamantine. Color cherry- 

 red. Streak cherry-red, or brownish-red. Translucent 

 in thin lamina. 



Sectile. Thin laminae are slightly flexible. Hardness 

 = 1-0... 1-5. Sp. gr.=4-493. 



Compound Varieties. Tufts of capillary crystals. Mas- 

 sive : composition very thin columnar, straight and diver- 

 gent from common centres. 



1. The variety of Red Antimony, called Tinder- Ore, comprises those 

 varieties which, originally consisting of short capillary fibres interlaced 

 with each other, appear in flakes resembling tinder. 



2. Alone before the blow-pipe, it melts easily upon charcoal, by which 

 it is absorbed, but is at last entirely volatilized. When immersed in ni- 

 tric acid, it is covered with a white coating. 



