102 



TAB. CLIV. 



PLUMBUM carbcmatum octaecirum. 

 Octaedral Carbonate of Lead, 



W e are indebted for the present specimen to James 



Brodie, Esq., who. brought it from Stolfield near Lossie 



Mouth, Elginshire, from an estate of John Brander, Esq. It 



is curious for having an octaedral crystal nearly resembling, 



at first sight, the secondary one figured by Haiiy, pi. 67. 



fig. 46. There are the four faces of the primitive octa- 



edron as mentioned by Haiiy, fig. 45. M : See the trapezoidal 



faces. It has also four triangular faces agreeing with y of 



fig. 50. — Haiiy. 



This specimen is an example of a hard flinty rock holding 

 Galcena or common Lead ore, sufficiently good to tempt 

 the miner; but the hardness of the rock is an obstacle not 

 easily overcome without an amazing expense. In these 

 improved times, however, I should think this difficulty 

 less considerable than formerly, if the ore is suffi- 

 ciently abundant. There is perhaps an additional hope to 

 the owner that he may not be aware of, which is, that 

 Phosphate and Carbonate of Lead accompany the Galaena ; 

 and where these are, the rock is fissile, and more easily ac- 

 cessible. The situation, as to distance of fuel and conve- 

 niences for smelting, is certainly to be considered. 



