ORDER XI. I'RISMATOIDAL ANTIMONY-GLANCE. 85 



is very delicate. The common Grey Antimony has been 

 farther subdivided into radiated, foliated, and compact. The 

 first contains the crystals and massive varieties with a 

 columnar composition, the second only granular composi- 

 tions, in which the individuals can still be distinguished ; 

 and the third those in which the composition is impalpable. 



2. According to PROUST and THOMSON, the prismatoi- 

 dal Antimony-glance consists of 



Antimony 75-00 73'77- 



Sulphur 25-00 26-23. 



Its chemical formula is Sb S 3 , corresponding to 72'77 of 

 antimony, and 27'23 sulphur. It is very fusible before the 

 blowpipe, and is absorbed by the charcoal. By a continued 

 blast it may be volatilised without leaving any considerable 

 residue. 



3. The greater part of the varieties of prismatoidal An- 

 timony-glance are found in veins, which in some instances 

 almost exclusively consist of this species. Yet it occurs 

 aUo in beds, particularly with brachytypous Parachrose- 

 baryte, and beds seem almost always to be the repositories 

 of the compact varieties. Frequently it is associated with 

 prismatic Hal-baryte, often with prismatic Purple-blende, 

 and commonly also with rhombohedral Quartz. It occurs 

 besides along with various other species of the orders 

 Glance, Blende, and Haloide, with prismatic Antimony- 

 baryte, and not unfrequently with hexahedral Gold. Its 

 decomposition produces the Antlniony-ochre, a friable or 

 compact yellow substance, with which it is often associated 

 or covered. 



4. Veins consisting almost entirely of the present spe- 

 cies have been discovered at Posing near Pressburg in Hun- 

 gary, and at Wolfsthal in the county of Stollberg in the 

 Hartz ; such as contain considerable quantities of it asso- 

 ciated with other minerals, at Felsobanya in Upper Hun- 

 gary, at Cremnitz, Scheninitz, and other places in Lower 

 Hungary, and in France, from whence beautiful varieties 

 are obtained. It occurs also in Scotland, in Cornwall, at 

 Braunsdorf near Freiberg in Saxony, and at Neudorf in 



