442 Pirsson and Washington — Geology of Red Hill, N. H. 



I. Paisanal liparose, Home Farm Quarry, Red Hill. H. S. 

 Washington anal. 



II. Paisanal liparose, Magnolia, Essex Co., Mass. (loc. cit). 

 H. S. Washington aual. 



III. Paisanal liparose, Mosquez Canon, Apache Mts., Texas 

 (A. Osann. Tsch. Mitth. xv, p. 439, 1895). Osann anal. 



IV. Paisanal liparose, Mt. Scholoda, Abyssinia (G. T. Prior, 

 Min. Mag. xii, p. 264, 1900). Prior anal. 



V. Riebeckite granite, Quincy, Mass. (H. S. Washington, 

 this Journal, vi, p. 181 (1898). Washington anal. 

 VI. Molecular ratios of No. I. 



The rock has somewhat lower silica and more alkalies and 

 alumina than the other members of this group ; it therefore 

 contains a little more feldspar and a little less quartz. It is 

 also a somewhat more sodic rock than they are. 



Classification. — The position of the rock in the quantitative 

 scheme of classification is shown by its norm and calculation 

 as follows : 



Norm 



Qz.. 12-90 



Or.. 32-80 Sal 92-33 T _ 



Ab.. 46-63 Sal = 92-33 F^m" = W- = 13 + = ' PerSalane 



Ac. 370 Q ig-go " 



Di .. 1-21 ™- = ^tttw = °' 16 = 4 > Britannare 

 TT i /in ' 9'4d 



ti " « t? «oo NaO' + KO' 148 



II. . . -61 Fern = 6-92 2 _, ^. 2 = = 1, Liparase 



Rest -35 CaO' * 

 K,0' 59 



" _ = — = - 64, 3, Liparose 

 Total 99-60 Na„0 89 ' ' F 



Its coordinates are I, 4, 1, 3 ; it is persalic, quardofelic, per- 

 alkalic and sodipotassic. Its texture is granular and micropor- 

 phyritic ; it is therefore graniphyri-liparose and has riebeckitic 

 amphibole as a varietal mineral. Since this is not present in 

 notable amount, the mode is normative within the limits of the 

 sub rang but a small amount of a critical mineral is present, 

 thus constituting a modal variety. The rocks thus known as 

 paisanites which fall within the limits of this rang, as most of 

 them do, are riebeckitic liparose. The . rock under discussion 

 may be thus taken as constituting a type with a given mode, 

 norm and texture to which the adjective paisanal may be 

 given, and it thus becomes paisanal liparose. 



In conclusion it is of interest to note that this new occur- 

 ence sustains Murgoci's* contention that the riebeckitic rocks 

 are accompanied by zircon and not by titanite, while the main 

 syenite, which it cuts and whose hornblende is cataphorite as 



* This Journal, xx, p. 137, 1905. 



