109 



the others , it was foiiiul in the ordinary form of columnar 

 aggregates. 



Turner S und. A single rather large infilling of a 

 cavity labout 2 cm.) was obtained from here. The outer lining 

 consists of a layer of small quartz crystals, while the inner 

 part is quite filled with columnar aragonite of a brownish 

 colour. 



Flache Bay. According to Lknz, whitish aragonite was 

 found here , both in the fibrous form and in masses with 

 radiating structure. 



Sabine Ö. Lenz mentions from this locality very fine 

 amygdaloids of whitish, prismatic aragonite. 



Shannon Ö. According to Lenz, a radiating group of 

 aragonite crystals, with a strong vitreous 

 lustre was found here. 



Jan iMayen. Small, colourless arago- 

 nite crystals (size 2 — 3"^™) partly arranged 

 in radiating groups, were found in one 

 cavity in a grey fine-grained basalt, the 

 other cavities containing calcite crystals. 

 The crystal form is that of longish prisms, 

 in the combination b[oio}, ы [i\0],k[0l\], 

 î{02l}. Most of the crystals are twinned, 

 often repeatedly so. One of the most com- 

 monly occurring forms is seen in figure 1. 

 The crystals are rather irregularly developed 

 and the faces are generally very rough. 



Fig. 1. Aragonite; 

 Jan Mayen. 



Thomsonite. 



Thi.s material has been found in a few localities in Kast- 

 Greenland. The crystals are very small as is usual with this 

 mineral. ;md the crystalform is, with one exception, badly 

 defined. — The localities are : 



