No. 7.] APATITE IN NORWAY. 435 



The two other segregations of Krageroe showed similar con- 

 ditions. The lumps of apatite sometimes reached an enormous 

 size. Besides the minerals already mentioned, ilmenite (in crystals 

 celebrated because of size), titanite, albite, calcspar and apparently 

 several other minerals were found when the mines were worked. 



Oedegarden (Bamle District). 

 S. E. from the largest of the Oedegarden veins and on the 

 other side of the ridge at whose foot lie the apatite veins pre- 

 viously described, there occurs on the declivity towards Havredal 

 an irregular vein of hornblende \ to 4 feet thick, which has been 

 traced for about 100 feet, intersecting the vertical strata of a 

 hornblendic gneiss poor in quartz. The vein consists of horn- 

 blende and a mineral resembling hornblende along with some 

 quartz, brown mica and lastly apatite and rutile in lumps. The 

 apatite is red and similar to that of Krageroe; of whose horn- 

 blende veins this whole deposit reminds us. 



In the Jungfernschurf, near to Oedegarden, there occurs in the 

 crystalline slates a small portion of a coarsely granular granite, 

 poor in mica, which is intersected by a diabase vein perfectly 

 similar to the numerous veins of the Christiania valley. A ver- 

 tical vein, one foot thick, of grey and flesh-red apatite along 

 with some hornblende and green enstatite intersects the granite 

 as well as the slates. Several similar stringers occur in the 

 granite, wherein stringers of green enstatite abound. 

 ° Near Roenholt, a little to the north of the Oedegardskjern 

 veins, described on page 429, there is a very interesting occur- 

 rence. A coarsely granular granite intersects the highly inclined 

 strata of hornblende slates (strike being about N. E. and S. W.). 

 Both granite and slates are interwoven by veins, consisting chiefly 

 of a green pyroxene,* rich in magnesia— in part a very fine mala- 

 colitfr— of rutile, brown coarsely crystalline hornblende f and, 

 finally, apatite. The pyroxene, rutile and apatite occurred 

 sometimes in large crystals. The rutile crystals were sometimes 

 bent and twisted. The thickness of one of the veins, around 

 which the slates were folded, was four feet. The veins send 

 numerous off-shoots into the granite, and sometimes even enclose 

 fragments of it, whereby the relations are very much complicated. 



* The angles ot the two cleavage planes were 87° 23' and 92° 39'. 

 f The angle of the very lustrous cleavage planes was 124° 24'. 



