4*8 On the ROCKS in the 



the higheft perfection. The occurrence of the analcime is 

 conne&ed with the fame fad. I have never been able to find 

 it on Salifbury Craig, excepting at one period, when an entire 

 fection of the bed was quarried off, and about the middle of this 

 the analcime occurred. 



No. 24.. with fulphate of barytes, with calcareous fparry iron- 

 ore. 



No. 25. part of a very irregular vein. Its fides are formed 

 of calcareous fparry iron-ore,, which is followed by a coating of 

 hematitic iron. Here the regular Gratification, as it is called, 

 of the vein ends, and calcedony, firft femitranfparent, then 

 opake, and common calcareous fpar, occupy the reft. 



No. 26. calcareous fparry iron-ore cryftallifed, with fome 

 tranfparent cryftals of quartz. 



No. 27. large cryftals of calcareous fpar, with cryftallifed 

 and radiated tufts of quartz. 



No. 28. red oxide of iron, with a vein of calcareous fparry 

 iron- ore. 



No. 29. green coloured quartz, with a coating of cryftallifed 

 quartz. 



No. 30. cryftallifed quartz, with amethyft. 

 Such are the minerals which occur on Salifbury Craig. Some 

 of them are rare, and others to be found only when the rock is 

 working in particular places. 



The next circumftance I have to notice, is the vein of 

 q-reenftone *. It occurs a little to the north of the fpot, to 



which 



* The term dyke has been xerj generally applied to veins of this description, 

 and I am not Satisfied that it is the leaf! proper of the two •, as there certainly 

 is a marked diftin&ion between veins comnofed of rocks, and what we general- 



