ON THE MINERALOGY OF THE FAROE ISLANDS. 463 



One of the most remarkable beds we observed, is the Green 

 stone mentioned by Mr Allan (p. 255. vol. vii. Royal Society 

 Transactions)^ which does not conform with the general posi- 

 tion of the trap. The annexed sections, Figs. 2, 3, 4. will give 

 a better idea of its position than can be done in words. 



Another bed of the same nature appears in Osteroe, near 

 Zellatrae, part of which is represented in the sketch Fig. 5. 

 Royanall is a mountain above 2000 feet high, nearly equi- 

 distant from Ore and Zellatra?. This bed, at the outcrop, is 

 broken into columns ; but, a few yards from it, the surface 

 seems quite compact. 



Near Rideviig is a curious mass or vein of basalt, Fig. 6. re- 

 posing on an amygdaloidal rock, which gave me the idea of a 

 stream of lava. It may be traced for about 30 yards, when it is 

 concealed by rubbish and earth. Its breadth is three yards 

 and one-half, and thickness one yard. 



Figure 7. represents a basalt lying on an amygdaloid, (the 

 shaded part), which also appears to be intersected by numer- 

 ous veins of the former, as if a number of fissures in it had 

 been filled up by the basalt flowing over it, when in a fused 

 state ; or perhaps it is a conglomerate, or trap-tuff. I am sorry 

 I neglected examining it more particularly. 



Near Leinum Lake we obtained specimens of noble, fire 

 and pearl Opal, in a bed of felspar-porphyry, through which 

 they are disseminated in small nodules. They were discover- 

 ed by Mr Holm of Quivig since Sir George Mackenzie's 

 visit. 



Native Copper is very frequent, though not abundant. It oc- 

 curs generally in amygdaloidal rocks. In Suderoe, near Fama- 

 rasund, we found it in thin plates in a bed of clay stone. Some 

 of it contains gold, also (but rarely) found separate. 



vol. ix. p. II. 3 n I 



