1813.] 



Minerals Jrom Greenland, 



107 



Tophe, in Daophine: it may also be observed, that in both, the 

 epidote and prehnite occur together. There is no such combi- 

 nation in the trap rocks which contain prehnite in this country. 

 That of Greenland appears to have occupied the interior of a 

 vein along with calcareous spar, and is crystaliized in minute but 

 remarkably distinct crystals, presenting the rhomboidal and 

 hexagonal table. I likewise observed specimens of stilbite, 

 analcime, and chabasie ; but all so much rubbed, that it was 

 difficult to recognise them. 



Mica, - 



Besides accompanying augite, as already mentioned, I found 

 this substance in large dark olive-green plates, also of a bright 

 emerald colour in minute laminss in a bit of gneiss. 



In this collection there were no minerals belonging to the 

 inflammable class, if I except plumbago, Vv^hich has recently 

 been transferred to it by Haiiy : some of this substance is so 

 pure in the grain as to be capable of tracing lines upon paper 

 with a clearness equal to that of Borrowdaie; others were very 

 coarse in the grain, and one I found intimately connected with 

 granite. 



METALS. 



Of these I foiuid the following varieties: — 



Lead, — Sulphuret, accompanying cryolite, as already described. 



Copper. — Grey sulphuret, blended w^ith a small proportion of 

 green carbonate. 



Iron. — Magnetic, hematitic, pyrites, and sparry ore. The 

 first occurred in sand, with particles of olivine, carnelian, and 

 dark-coloured mica, in irregular masses, imbedded in a 

 granitic rock along with amphibole, also massive blended w^'th 

 ampbibole, and accompanied with apatite. ' 1 he hematitic 

 iron in its common state, and mixed in a stratified manner, 

 with what appears to be ferruginous sandstone. The pyrites, 

 and sparry iron ore, have already both been noticed as accom- 

 panying cryolite 



Tin. — Of this substance I found two or three specimens crys- 

 tallized in quartz, and accooipanied with a few specks of 

 felspar. This differs from the Cornish tin by submitting to 

 the blow-pipe without decrepitation. 



Molyhdena occurred in a few specimens composed of quartz, 

 intimately blended with light greenish yellow chlorite, dis- 

 persed in very minute specks through tbe mass. 



Yitroianialite. — The collumbite of Harchett is the same as this 

 mineral without yttria. This substance is exactly similar in 

 colour to the allanite; but its compact texture, and smooth 

 shining conchoidal fracture, induced me to suspect some 

 difference ; this suspicion was strengthened by the specific 



