Pirsson and Washington — Geology of New Hampshire. 511 



constituents, referred to the percentage of silica or to the ratios 

 of salic to femic minerals, are the usual ones, Fe 2 3 , FeO, 

 MgO, CaO and Ti0 2 increasing with decreasing silica, K 2 

 dropping sharply toward the femic end, while Na 2 also drops 

 but to a much less extent. 



Regarded from the point of view of the quantitative classifica- 

 tion, the range of classes is from persalane to salfemane ; the 

 orders are only two, 4 and 5, the former being found only 

 among the persalanes; the rangs represented are three, 1, 2 

 and 3, the first being most prominent in the persalanes and the 

 last only found in the salfemanes; while there are only two 

 subrangs, the sodipotassic and dosodic, the more salic and alka- 

 lic rocks belonging mostly to the first of these and the more 

 femic and more calcic ones to the second. 



Analyses of the Belknap Eocks. 



No. 



I 



II 



III 



IV 



V 



VI 



VII 



VIII 



IX 



Si0 o ._ 



15-65 



68-16 



69-76 



60-75 



59-91 



52-95 



43-94 



42-73 



60-33 



Al A . 



12-89 



15-27 



18-22 



19 55 



15-82 



14-96 



16-17 



14-50 



17-69 



Fe 2 3 - 



0-89 



0-88 



0-25 



1-54 



2-93 



2-44 



3-96 



4-03 



2-24 



FeO_. 



I'll 



1-87 



1-59 



2-98 



4-61 



7*03 



10-06 



7-28 



3-80 



MgO - 



0-20 



1-26 



0-40 



0-81 



1-64 



3-86 



5-05 



5-46 



1-23 



CaO .. 



0-48 



0-15 



2-68 



2-29 



1-92 



6-76 



9-59 



8-46 



2-11 



Na,0_ 



3-71 



4-30 



4-06 



4-89 



4-52 



4-95 



2-93 



3-11 



4-71 



K 2 0__ 



5-50 



7-06 



2-06 



5-90 



6-61 



1-64 



1-51 



2-28 



6-26 



H 2 + 



0-15 



0-37 



0-50 



0-08 



0-43 



0-55 



1-42 



3-08 



0-26 



H 2 0- 



0-08 







0-15 



0*24 







0-09 



0-13 



0-36 





co 2 .. 



none 



none 



none 



none 



none 



none 



0-09 



3-76 



none 



Ti0 2 _. 



0*05 



0-59 



0-36 



0-63 



1-39 



3-90 



4-13 



4-30 



1-01 



PA-- 



__- 



0-09 







0-13 



0-22 



0-76 



0-69 



0-93 



0-18 



s _... 

 CI .... 

 Zr0 2 _. 



--- 



--- 



--- 



--- 



--- 



0-05 



--- 



0-18 

 tr 



... 













0-02 





- - _ 



NiO .. 



















. 











tr 





MdO_. 



tr 







tr 



tr 







tr 



tr 



0-19 





BaO.. 



--- 



--- 



--- 



-■-- 



--- 



none 



none 



'tr 



--- 



100-71 100-00 100-02 99-79 100*00 100-16 99'67 100'65 99'82 

 Subrange 1.4.1.3 1.4.1.3 1.4.2.4 1.5.2.3 II.5.1. 3 II.5.2.4 III.5.3.4 III.5.3.4 I-II.5.2.3 



I. Biotitic grano-liparose, (aplite). Dike, Mt. Belknap. 



II. Hornblendic grano-liparose, (syenite). Locke's Hill. 



III. Biotitic grano-lassenose, (adamellite-aplite). Piper Moun- 

 tain. 



IV. Hornblendic grano-pulaskose, (syenite). Mt. Belknap. 



V. Hornblenditic grano-ilmenose, (syenite). Gunstock Peak. 



VI. Hornblende akerose, (spessartite). Locke's Hill. 



VII. Gilfordal camptonose, (essexite). Locke's Hill. 



VIII. Hampshiral camptonose, (camptonite). Mt. Belknap. 



IX. Hornblendic pulaskose-monzonose, (syenite). Average 

 of IV and V. 8 



