‘ 
418 On the ROCKS in the 
the higheft perfe@ion. The occurrence of the analcime is 
connected with the fame fact. 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 aabphate of barytes, with calcareous {parry iron- 
ore.. 
No. 25. part of a very irregular vein. Its fides are formed 
of calcareous {parry iron-ore, which 1s followed by a coating of 
hematitic iron. Here the regular ftratification, as it is called, 
of the vein ends, and calcedony, firft femitranfparent, then 
opake, and common calcareous f{par, occupy the reft. 
No. 26. calcareous {parry iron-ore cryftallifed, with fome 
tranfparent cryftals of quartz. 
No. 27. large cryftals of calcareous {par, fick cryftallifed. 
and radiated tufts of quartz. 
No. 28. red oxide of iron, with a vein of calcareous {parry 
iron-ore. 
No. 29. green coloured quartz, with a coating of cryftallifed 
quartz. 
No. 30. cryftallifed quartz, with amethyft. 
Sucu 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. 
Tur next circumftance I have to notice, is the vein of 
creenftone *. It occurs a little to the north of the fpot, to 
which 
* The term dyke has been very generally applied to veins of this defeription, 
and-I am not fatisfied that it is the leaft proper of the two; as there certainly 
is a marked diftin@ion between veins compofed of rocks, and what we general- 
ly 
