132 



Kilometres ^ n examination under the microscope 



shows that this greenish feldspathic mineral 

 is scapolite secondary after plagioclase. In 

 some places the polysynthetic twinning of 

 the plagioclase can still be seen in the scapo- 

 lite. Most of the amphibole is a rich green 

 original hornblende, but some of it is secondary 

 uralite after augite. This secondary horn- 

 blende is darker in color, and is more or less 

 fibrous or shreadlike, and is intergrown with 

 pyroxene, which often remains as "rests" 

 with a collar or uralite surrounding. Acces- 

 sory minerals in the scapolitized rock are 

 epidote, enstatite, rutile, and pyrrhotite. 



For these reasons, this rock has been termed 

 a plagioclase scapolite diorite, and where it 

 has been rendered more or less foliated or 

 schistose, it is called a "plagioclase scapolite 

 amphibolite. " The scapolitized gabbro is 

 much freer from oxide of iron than is the 

 ordinary augite diorite or gabbro, and Dr. 

 W. G. Miller suggests [6] that in the process 

 of alteration of the gabbro, the iron oxides 

 were leached out, and deposited from solution 

 in the neighboring limestone, thus giving rise 

 to the iron ore bodies. 



From this point a return is made over the 



branch railway line to God- 



37 m. Godfrey frey, and thence northward 



59 -2 km. Parham. over the main line to Park- 



47 m. ham. In this vicinity the 



75 -2 km. railroad passes through some cuts in the 



same scapolitized gabbro. One of these 



ridges followed northwestward leads to Eagle 



lake, where another abandoned phosphate 



mine, the Boyd Smith, is seen. 



This property was second only to the Fox- 

 ton mine, as a producer of 

 Boyd Smith phosphate, when that in- 

 Phosphate dustry was at its height. 

 Mine. At that time considerable 



titaniferous magnetite was 

 found, and some of it was formerly mined. 



