GEOLOGICAL AND MINERALOGICAL NOTES. 117 



patches, numerous perfect zircon crystals, fine sections of 

 nepheline, some apatite and magnetite with a ground-mass 

 of thin films of quartz. 



Sections prepared from the outcrop on the east side 

 of Briscoe Hill in Beverly are of similar composition, 

 but contain in addition olivine and titanite. At the ledge 

 used for road building purposes on Poor House hill, Bev- 

 erly, there are two well marked forms. One is rich in 

 hornblende, contains little augite and has much quartz, 

 not only as a ground-mass but also as distinct patches with 

 fine large crystals of microcline-microperthite (the soda- 

 microcline of Professor Brogger) , some segirine crystals, 

 apatite and magnetite. The other is rich in augite, still 

 having considerable quartz, some hornblende, biotite, 

 aegirine and nepheline. The first, except for the segirine 

 and microcline-microperthite, would be classed as horn- 

 blende-granitite. The other is nearly if not quite like the 

 typical augite-syenite. In this last a vein of pyrrhotite 

 of a rich yellow bronze color is seen which carries a small 

 percentage of nickel. Molybdenite also occurs in this 

 outcrop. 



Several thin sections of the rock in the massive outcrop 

 near Magnolia Station, and in the railroad cutting one hun- 

 dred yards eastofthe station, when studied with the polariz- 

 ing microscope, were found to be composed of microcline- 

 microperthite, well twinned plagioclase, orthoclase, augite, 

 green hornblende, red biotite, zircons, apatite, fine sec- 

 tions of titanite, much magnetite, some limonite, nepheline 

 and isotropic sections of sodalite which gelatinized readily 

 with hydrochloric acid. Some sections also contained regu- 

 lar crystals of hypersthene and some well formed crystals 

 of olivine and in one of the sections there were large patches 

 of elasolite. The color of the whole rock mass in fresh 

 hand specimens is dark grayish and green. This rock is 



