430 THE CANADIAN NATURALIST. [Vol. viih 



Still farther eastwards there occurs a third vertical vein of 

 granular green and compact bluish-black hydrous enstatite, some- 

 times crystallised towards the middle of the vein, which part is 

 occupied by apatite and rutile. In the neighbourhood there are 

 smaller veins of red feldspar and rutile along with some of com- 

 pact red feldspar, rutile, hornblende, apatite and the same green 

 enstatite that occurs at Oedegarden and in many other deposits. 



Fogne (Gjerrestad District). 



This deposit has been already described by Joh. Dahll. The 

 country rock is a "spotted gabbro " similar to that of Oedegar- 

 den, but often of coarser grain and more schistose. One vein 

 consists chiefly of magnetic pyrites and pyrites with some apatite 

 (often crystallised) ; another large vein consists of rutile and 

 green pyroxene (both sometimes crystallised) along with apatite. 



Hiasen (Gjerrestad District'). 



Hiasen is a small cone of gabbro that rears itself above the 

 surrounding strata of the primary hills. The deposit can be 

 briefly described as apatite- bearing veins of hornblende ; which 

 were very profitably worked in the years 1858-1859. 



Asildsdal (Hiasen). The rock in which the veins occur is a 

 hardly recognisable gabbro. The veins are large, but irregularly 

 branched and split up. They consist of ordinary coarsely radiated 

 hornblende, which carries apatite in lumps. On the dumps we 

 also found ilmenite, spathic iron, feldspar, quartz, scapolite, tour- 

 maline and calcspav. In one of the pits the vein of hornblende 

 changed into a mass of calcspar. 



Persdal (Hiasen). The veins are irregularly bifurcated, and 

 sometimes more than five feet thick ; they consist of coarsely 

 radiated hornblende, sometimes with lumps of apatite, and some- 

 times without it. The country rock is a " spotted gabbro." 

 Some of these veins also contain magnetic pyrites, which some- 

 times forms the chief mineral. (Note. — An illustration of these 

 latter veins is inserted here.) Oo the right, one sees the coarsely 

 radiated hornblende, whose individuals are arranged at right 

 angles to the edge of the country rock ; moreover, the vein mass 

 consists chiefly of magnetic pyrites, wherein numerous dirty 

 yellowish-green crystals of apatite lie, whose corners and edges 

 have been rounded and apparently fused. On the right hand of 

 the drawing, isolated fragments of hornblende are also observed 



