VICINITY of EDINBURGH. ary 
fragment of the ftratified matter imbedded in the green- 
ftone, a circumftance connected with a very important clafs 
of facts. 
No. 16. This fpecimen of greenftone is remarkable, as exhi- 
biting a variety of colours; thefe are not blended, but diftin@- 
ly divided from each ether. The colours are iron-grey, light- 
grey, dark-red, and brick-red. 
No. 17. This fpecimen is a {trong example of the improprie- 
ty of the name which it bears; it is a greenftone, decidedly of 
a red colour. The fingular penetration of ferruginous matter, 
which is exhibited in various parts of this rock, is not eafily ac- 
counted for; but fuppofing it to have been once in a ftate of fu- 
fion, it may have obtained this fuperabundance of iron by ab- ! 
forption, as the adjoining ftrata frequently abound in that 
mineral. 
In various parts of the Craig, veins of a peculiar nature may 
be obferved ; they are compofed precifely of the fame ingre- 
dients as the rock, and are diftinguifhable only by the red co- 
lour of the felfpar, (No. 18). Thefe are termed contemporaneous 
veins, or veins of secretion ; they are deeply wayed, and gene- 
tally follow the direction of the bed. Some of them prefent a 
very bright brick-red colour, (No. 19.), mixed with fpecks of 
calcareous fpar. 
Nos. 20, 21. in thefe {pecimens, are fmall globules of a black 
earthy fubftance, which I am at a lofs to name. I fhould have 
confidered it Amphibole, but for the next fpecimen, (No. 22.), 
in which the fame fubftance appears-to occur in irregular 
fragments. 
No. 33. Analcime with cryftallifed Calcareous Spar. I be- 
fore noticed, that it was in the heart of the bed where the 
_fubftance of the greenftone prefented the cryftalline texture in 
Vou. VI. P. I. 3G the 
