a2o A SYSTEM OF 



it is like wife fo often equally mixed with the faid 

 copper and lead ores, as not to be eafily perceived, 

 if one is not previoufly acquainted with them. It 

 ieems, never thelefs, reafonable, that a true mine- 

 ralift ought rather to fufpect the ore called Braun- 

 Meyer tz (Sed;. ccxxx.) to be a zink ore, than to 

 fuppofe this femi-metal to be a product of lead, 

 copper, and iron. 



SECT. CCXXXIL 



4. Antimony, Antimonium. Stibium. This femi- 

 metal is 



a. Of a white colour almoft like filver, 



b. Brittle; and in regard to its texture, it 

 confifls of mining planes, of greater length 

 than breadth. 



r. In the fire it is volatile, and volatilifes part of 

 the other metals along with it, except gold 

 and platina. It may, however, in a mode- 

 rate fire be calcined into a light grey calx, 

 which is pretty refractory in the fire, but 

 melts at laft to a elafs of a reddifh brown 

 colour. 



d. It diffolves in fpirit of fea-falt and aqua 

 regia, but is only corroded by the fpirit of 

 nitre into a white calx •, it is precipitated 

 out of the aqua regia by water. 



e. It has an emetic quality when its calx, 

 glafs, or metal, is diffolved in an acid, 

 except when in the fpirit of nitre, which 

 has not this effect. 



f. It amalgamates with quickfilver, if the re- 

 gulns, when fufed, is put to it ; but the 

 quickfilver ought for this purpofe to be 

 covered with warm water ; It amalgamates 



with 



