178 



Miscellanies. 



occurs quite abundantly at Molieres, department of Gard, where it is 

 found in masses, whose fracture exhibits a crystalhne structure ; dis- 

 tinct crystals have not been obtained. It has a bluish gray color, 

 with a metallic lustre, and a specific gravity of 5.97. It is frequent- 

 ly covered in spots with hydrate of iron, and also a yellow substance, 

 which appears to be composed of the antimonic acid and the oxyd 

 of lead, and to have proceeded from the decomposition of the min- 

 eral. Its gangue is quartz and iron pyrites. 



It fuses readily under the blowpipe, with exhalations of sulphu- 

 rous acid and the white vapors of oxyd of antimony. On charcoal, 

 a yellow circle indicates the presence of lead. It is easily attacked 

 by nitric acid, and gives rise to an Antiraonate or Antimonite of 

 Lead. Boiling, concentrated hydro-chloric acid dissolves it com- 

 pletely, with the extrication of sulphuretted hydrogen. 

 Its composition is as follows : 



Sulphuret of antimony, - - - 



Sulphuret of lead, _ _ _ 



Sulphuret of iron, _ _ _ 



Sulphuret of copper, _ _ _ 



35.0 

 62.1 

 01.9 

 01.1 



100.1 



Neglecting the copper and iron, its formula is Sb Pb ^ . — D. 



25. Brevicite, a new Mineral; by M. Sonden. (Neues Jahr- 

 buch fiir Min. Geog., &sc., von Leonhard und Bronn, 8es H., 

 1835.) — This mineral was sent to Berzelius by M. Strom, from 

 Brevig in Norway, where it exists, filling the cavities of a trachytic 

 rock, and from which place it received its name. It occurs in white 

 lamellar radiated masses, with transparent prismatic crystals, usually 

 in the interior of the cavities. It is crossed by large bands of a deep 

 dirty red color. Its composition is as follows ; 



100.00 



