436 THE CANADIAN NATURALIST. [Vol. viii. 



(Note. — A number of other deposits are then briefly described. 

 But the authors remark that they are of no practical importance 

 and were not critically studied ; therefore it is not thought 

 necessary to translate these descriptions.) 



Our apatite deposits have all been formed in the same way. 

 The veins show in regard to their mineral contents conditions 

 differing from one another ; we will, therefore, attempt to point 

 out, especially on this point, connections and transitions. 



There occur at Oedegarden almost pure veins of mica, apatite- 

 bearing veins of mica, mica-hornblende veins and veins of horn- 

 blende, all under precisely similar conditions ; in many small 

 deposits of hornblende and also in the great segregations of horn- 

 blende at Krageroe hornblende, and not mica, is the chief mineral. 

 The veins of Ravneberg, which remind one very much of those 

 of Oedegarden, form with their vertical mica-hornblende segrega- 

 tion a perfect transition to the segregations of Krageroe. 



The apatite-bearing veins of hornblende often carry magnetic 

 pyrites : transitions from the one to the other may be observed, 

 as it gradually increases in quantity. At Bamle we saw small 

 veins consisting exclusively of magnetic pyrites , in one and the 

 same deposit also the magnetic pyrites occurs at one time merely 

 as an accessory, at another as almost the only mineral. 



In the apatite-bearing veins of hornblende feldspar or quartz, 

 or both together, occur not unfrequently. Here also through 

 several deposits it can be traced out how the feldspar or quartz 

 increases in quantity until it predominates ; which justifies the 

 designations "apatite-bearing feldspar veins," or ''quartz veins." 

 When both minerals predominate and mica is also present we 

 have the so-called "apatite-bearing granite veins," which are 

 hardly to be distinguished, except by the apatite, from the nu- 

 merous ordinary granitic veins of the region. 



Scapolite occurs sometinaes as merely accessory, at others as a 

 more important element, and in one deposit as almost the only 

 mineral. The oft-mentioned crystals of green enstatite recur in 

 their characteristic shape and with the same chemical composition 

 in the various deposits, and connect them together. Enstatite also 

 sometimes occurs with the apatite as almost the only mineral, 

 so that the deposits merit the name of " apatite-bearing enstatite 

 veins." 



An equally common and characteristic mineral is rutile. This 

 a iso in rare cases predominates. 



