46 On the Pseudomorphic Minerals found in Scotland. 



As the crystals are rough (they occur in quantity too small for 

 accurate investigation), it is not improbable that the substance 

 as well as the form is that of scapolite ; if so, it is the only loca- 

 lity in the British Islands at which that mineral has as yet been 

 observed. 



Lanarkshire. At the Lead-hills, — 



Galena after pyromorphite, form ao, fig. 17. 



Quartz after Anglesite, in long bladed crystals. 



Quartz after barytes, form indistinct. 



Quartz after psilomelane, botryoidal. 



Quartz after galena, form P, fig. 18. 



Cerussite after galena, form P, 



Chrysocolla after galena, form P. 



ChrysocoUa after cerussite, form M « P « bp, fig. 19. 



Fig. 17. 



Fig. 18. 



Fig. 19. 



Minium (ferruginous) after galena, form P. 

 Calcite after galena, form P o, fig. 20. 

 Wad after calcite, form du, fig. 21. 



Fis. 20. 



Fig. 21. 



This unique specimen, which is now in the cabinet of Mr. 

 Dudgeon of Cargen, is most beautifully studded with minute 

 crystals of Arragonite, all of which are disposed over the surface 

 of the pseudomorph, so that their long axes are parallel to the 

 plane u. 



