the Analyses of M. Klaproth. 433 



"Exposed on charcoal to the blowpipe it requires a pretty 

 stron>i heat to be fused ; the antimony is dissipated in fumesj 

 and leaves a button of pure silver. 



Twentv-five grains of this ore, treated in a cupel with 

 four grains of lead, gave a button of silver weighing 19^ 

 grains. 



A hundred parts, treated by the nitric and muriatic acids^ 

 gave 



'Silver - - - 77 



Antimony • » - 23 



100 



Analysis of the Hed Fibrous Ore of Antimony of Braunsdorf^ 

 in Saxony. 



The matrix of this ore is gray quartz j it is generally 

 found with ore of gray antimony, and some insulated crys- 

 tals of white antimony. 



This ore has a beautiful mordorc and crimson colour, tm 

 which account it has been called native mineral kermes. It 

 sometimes exhibits varied colours at its surface. It forms 

 small needly or capillary crystals, sometimes single, and 

 sometimes united in bundles ; they have a silky splendour^ 

 and are opake. 



It is difficult to determine their specific gravity, on 

 account of the air-bubbles which are collected in the tufts 

 of the small capillary crystals, and which it is difficult to 

 expel. According to M. Klaproth it is 4090. This .ore 

 contains 



Antimony - - - 67*50 



Oxygen - - - - 10-80 



Sulphur - - - - 19*70 



Native kermes mineral differs then from gray sulphuret 

 of antimony only by the greater degree of the oxidation of 

 the antimony. 



Analysis of the White Ore of Antimony of Przilrcm, in 

 Bohemia. 

 This ore, lately discovered, is composed of crystals in 

 paralklopiped laminae. They are white, brilliant and radi- 

 ated at the surface. The largest are nine lines in length and 

 three in brtadtli. Strong compression is sufficient to make 

 them separate into small needles, which resemble those of 



amianthus. 



