94 



resemblance lo certain kinds of Apophyllite, so much so, that 

 Sir Charles Giesecke, who discovered them in the island of 

 Disco, in Greenland, was induced to consider them as a parti- 

 cular subspecies of it, the micaceous apophyllite". The first 

 five specimens described in this paper by Haidinger are mesole 

 (or faröelite, i. е. lamellar radiated thomsonite) from Nol s о in 

 Færoe, while No. 6, "discovered by Sir Charles Giesecke at 

 Nia Kornak in the island of Disco, Greenland" ^) had a specific 

 gravity of 2"382, and is said lo have occurred in reniform 

 groups, the individuals being "similar to those of var. 4, but 

 larger": it was most probably therefore mesole. But the two 

 last specimens described by Haidinger are, there can hardly be 

 any doubt, gyrolite, as was pointed out by M. F. Heddle^). 

 They are thus characterized by Haidinger: 



«7. The size of the plates is here between a quarter of 

 an inch and half an inch. They have a bright pearly lustre 

 on their cleavage planes, and the whole aggregate resembles 

 in no small degree the crystallized spermaceti. The colour of 

 this variety is white, slightly yellowish. It forms part of the 

 inside of a geode detached from one of the vesicular cavities 

 of basalt. It is from, Karartut, near Godhavn, in the island 

 of Disco. 



8. Large individuals aggregated and coarsely forming reni- 

 form shapes. The surface is dark yellowish-grey, the colour 

 on the cleavage planes almost straw-yellow; the whole ap- 

 parently decomposed. Cleavage is very easily obtained, and 

 the laminae show some elasticity when we attempt to separate 

 them. This specimen is a native of Nia Kornak in the Ome- 

 naksfiord, like the preceding in the island of Disco.» 



It is no doubt also gyrolite which is referred to by Lévy^} 



^) More properly Niakornat. This locality is not on Disko but on the 



peninsula Nugsuak, Umanak-Fjord. 

 -) The Mineralogy of Scotland, 2, 1901, p. 79. 

 ^) Description dune collection de minéraux formée par M. Henri Heuland 



et appartenant à M. Ch. Hampden Turner, 1828, 2, pp. 272 and 274. 



