The Monteregian Hills. 



233 



mentioned, either kaolin or muscovite. Probably both 

 are present. 



Apatite is present in considerable amount and in the 

 form of perfect crystals, occurring chiefly in the mica, 

 hornblende, and sphene. 



The iron ore and sphene present the same characters as 

 in the case of the essexite, but the latter mineral is 

 relatively more abundant than in that rock. 



An analysis of this pulaskite is given in the accom- 

 panying table together with analysis of the pulaskite and 

 the nordmarkite of Shefford mountain described by 

 Dresser. Analysis of three allied rocks from other locali- 

 ties are added for purposes of comparison. 





VII 



VIII 



IX 



X 



XI 



XJ.I 



SiO, 



Ti0 2 



A1 2 3 



Fe 2 3 



FeO 



57.44 

 197 



19.43 

 1.69 

 2.70 

 0.25 

 1.16 

 2 66 

 not det. 

 6 48 

 4.28 

 0.60 

 not det. 



trace 

 1.03 



59.96 

 66 



19.12 

 1.85 

 1.73 

 0.49 

 65 

 224 

 .12 

 6 98 

 4.91 

 0.14 

 008 

 0.14 

 1.10 



65.43 

 0.16 



16.96 

 1.55 

 1.53 

 0.40 

 0.22 

 1.36 



none 

 5.95 

 5.36 

 0.02 

 06 

 004 

 82 



56.45 

 0.29 



20.08 

 1.31 

 4.39 

 0.09 

 0.63 

 2.14 



5.61 

 7.13 

 0.13 



43 

 1.51 



59.01 

 0.81 



18.18 

 1.63 

 3.65 

 0.03 

 1.05 

 2.40 

 .08 

 703 

 5.34 



trace 



0.12 

 0.50 



60.03 



20.76 

 4 01 

 75 



MnO 



MgO 



trace 

 80 



CaO 



BaO 



NaaO 



K 2 



P 2 6 



so 3 



2.62 



596 



5 48 

 0.07 



CI.. 



HoO 



0.59 









99.69 



100.17 



99.86 



100.19 



99.98 



101.07 



VII. Pulaskite (laurvikose), Mount Johnson, Quebec. 



VIII. Pulaskite (laurvikose), Shefford mountain, Quebec. 

 (American Geologist, 1901, p. 211). 



IX. Nordmarkite (nordmarkose), Shefford mountain, Quebec, 

 (Ibid., 1901, p. 209). 



X. Sodalite syenite, Square Butte, Montana (differentiation pro- 

 duct of shonkinite). 



XI. Umptekite, Red Hill, Moltonboro, New Hampshire. 



XIL Pulaskite, Fourche mountain, Arkansas (original locality). 



