No. 7.] APATITE IN NORWAY. 431 



in the magnetic pyrites. Another small adjacent vein consists 

 exclusively of coarsely crystalline prisms of hornblende, arranged 

 perpendicularly to the side-walls. 



The above-mentioned fact, that the crystals of apatite enclosed 

 in the magnetic pyrites have been rounded on the corners and 

 edges, has been met with by us also in other localities where 

 magnetic pyrites is the principal mineral of the apatite-bearing 

 veins. On Hiasen we saw for the first time, on a small scale, an 

 interesting circumstance, which we shall mention more minutely 

 farther on, in describing the following deposit. In the common 

 dark gabbro, namely, there occurred, close to the veins, some 

 very small stringers of hornblende (not over half an inch thick) 

 carrying apatite, enclosed on both sides by a zone, up to three 

 inches thick, of a " spotted gabbro " — similar to that of Oede- 

 garden. As already mentioned, the veins of Hiasen that are 

 described above occur ina " spotted gabbro," which encloses it 

 on both sides ; whereas the rock of Hiasen is otherwise a com- 

 mon dark gabbro. The " spotted gabbro" does not extend to 

 equal distances on both sides of the veins ; whilst in one direc- 

 tion it stretches far towards the peak, it is necessary to go only 

 a few steps in the other in order to encounter the common dark 

 gabbro. 



Regardsheien and Ravneberg (Soendeloer District). 



Regardsheien and Ravneberg are two portions of one and the 

 same ridge of rock, on whose precipitous declivity towards the 

 Soendeloevsfjord, the veins of apatite crop out, which (next to 

 those of Oedegarden) are at present most full of promise. The 

 ridge consists chiefly of gabbro, which intersects the strata of 

 the primary range ; and the veins occur in the gabbro. Even 

 in sailing past, their position can be made out from the vessel, 

 as sometimes the piled-up dump beneath marks their locality, 

 and sometimes the rich veins themselves show as a clear stripe 

 upon the dark rock. 



On Regardsheien there are five large veins, 150 to 200 feet long, 

 and \ to \\ feet thick. The veins, which pinch out, as usual, 

 are approximately parallel, overlying one another at a small 

 angle ; four dipping slightly (30°), but the fifth more strongly, 

 inwards towards the ridge. In their course, they send numerous 

 small off-shoots into the country rock. The veins consist of apatite- 

 bearing hornblende, the sides being coarsely-radiated hornblende 



