TAB. LXXXIX. 



PLUMBUM carbonatum. 



Carbonate of Lead. 



Class 3. Metals. Order 1. Homogeneous., 

 Gen. 13. Lead. Spec. 2. Carbonate. 



Div. 1. Crystallized. 



Spec. Char. Combined with carbonic acid. 



Syn. White lead ore. Kirw. v. 2. 203. Jameson, 



Weisses bleierz. Emmerl. v. 2. 388. 



Mine de plomb blanche. De Lisle, v. 3. 380. 



Plomb carbonate. Ha'uy,v. 3. 475. 



Carbonate of lead has often a great resemblance to car- 

 bonate and sulphate of barytes. It has, however, the advan- 

 tage of weight, is generally more milky in its appearance, 

 and is mostly shorter in the cross fracture; it is also softer. 

 When crystallized, it is more deceptive, assuming the 

 double pyramidal dodecaedron of quartz. It is however 

 most readily to be scratched with a knife, which quartz will 

 not admit of; and when carefully examined, there are very 

 few specimens of this sort that do not indicate a very 

 curious tendency to forming one crystal out of many plated 

 ones. These plates are often so placed that it is difficult to 



a 2 



