16 



was met with at the locality l\o. 4, partly as crystals, and partly 

 as small masses of irregular form. The crystals are indistinctly 

 developed and show only the faces of the cube, which are 

 always uneven and dull. The irregular galenite masses seem 

 to have been subject to some decomposing process. They are 

 surrounded by a zone consisting of a yellowish brown, earthy 

 decomposition product, which, at least partially, may consist 

 of minium. Internally the irregular grains as well as the 

 crystals are quite fresh and display on the cleavage planes the 

 characteristic metallic lustre. 



3. Sphalerite. 



This sulphide is of still rarer occurrence on Narsarsuk than 

 galenite. It has been observed only on a single specimen 

 found at the locality No. 2. The associated minerals on the 

 specimen are epididymite, elpidite, polylithionite and other 

 minerals common at this locality. The sphalerite occurs in 

 irregular grains of the size of a pea, on which traces of cry- 

 stal outlines are sometimes observable. The grains are rather 

 strongly corroded so as not quite to fill the cavities in which 

 they are found. They are surrounded by an ochreous sub- 

 stance which is the result of the decomposition of the mineral. 

 The mineral has a clear, resin-brown colour and very distinct 

 cleavages. 



4. Fluorite. 



This mineral is one of the most common on Narsarsuk 

 and has been found at most of the localities there, though 

 only in small quantities. It occurs massive as well as in crystals. 

 Massive fluorite is at many of the localities the last substance 

 filling the spaces between crystals of other minerals, as zircon, 

 ægirine etc. it is violet -red to colourless. Spots of deep 

 colour often occur in a generally colourless mass of the 

 mineral. The octahedral cleavages are very distinct. 



